Journal articles on the topic 'Ceramic materials - Thermal properties'
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1
Liu, Bing Feng. "Properties and Manufacturing Method of Silicon Carbide Ceramic New Materials." Applied Mechanics and Materials 416-417 (September 2013): 1693–97. http://dx.doi.org/10.4028/www.scientific.net/amm.416-417.1693.
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Ceramic industry developed rapidly in recent years, a greater demand for new materials. SiC ceramics as one of candidate materials that a few suitable for use high-temperature structural parts, shows its unique advantages in the high temperature, thermal shock, corrosive and other harsh environments. Its high temperature performance and application potential has attracted people's attention, but its properties make it difficult sintering at atmospheric pressure, unable to meet the needs of industrial production. Pressure less sintering technology has become the key in its application promotion. As strong antioxidant activity, better abrasion resistance, hardness, thermal stability, high temperature strength, thermal expansion coefficient, thermal conductivity and thermal shock and great chemical resistance and other excellent characteristics, Silicon carbide ceramics are widely used in various fields. Based on the silicon carbide ceramic materialisms development process, characteristics, international research and proposed several status of sintering silicon carbide ceramic, and discuss its development trends.
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Wu, Shuo, Yuantao Zhao, Wenge Li, Weilai Liu, Yanpeng Wu, and Fukang Liu. "Research Progresses on Ceramic Materials of Thermal Barrier Coatings on Gas Turbine." Coatings 11, no. 1 (January 11, 2021): 79. http://dx.doi.org/10.3390/coatings11010079.
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Thermal barrier coatings (TBCs) play a vitally important role in protecting the hot parts of a gas turbine from high temperature and corrosion effectively. More and more attention has been paid to the performance modification of ZrO2-based ceramics and seeking for new ceramic materials to meet requirements of gas turbine TBCs. The working principle, merits, and demerits of main technologies for coating preparation are elaborated in this paper, and the properties of new ceramic materials are reviewed. It is found that the thermal conductivity, thermal stability, mechanical properties, and other performances of traditional ZrO2-based ceramics could be improved effectively by doping modification. The emphases for new ceramic materials research were put on pyrochlores, magnetoplumbites, rare-earth tantalates, etc. Rare-earth tantalates with great potentials as new top ceramic materials were described in detail. In the end, the development directions of advanced top ceramic coatings, combining doping modification with preparation technology to regulate and control structure property of high-performance ceramic material, were put forward.
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Wu, Shuo, Yuantao Zhao, Wenge Li, Weilai Liu, Yanpeng Wu, and Fukang Liu. "Research Progresses on Ceramic Materials of Thermal Barrier Coatings on Gas Turbine." Coatings 11, no. 1 (January 11, 2021): 79. http://dx.doi.org/10.3390/coatings11010079.
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Thermal barrier coatings (TBCs) play a vitally important role in protecting the hot parts of a gas turbine from high temperature and corrosion effectively. More and more attention has been paid to the performance modification of ZrO2-based ceramics and seeking for new ceramic materials to meet requirements of gas turbine TBCs. The working principle, merits, and demerits of main technologies for coating preparation are elaborated in this paper, and the properties of new ceramic materials are reviewed. It is found that the thermal conductivity, thermal stability, mechanical properties, and other performances of traditional ZrO2-based ceramics could be improved effectively by doping modification. The emphases for new ceramic materials research were put on pyrochlores, magnetoplumbites, rare-earth tantalates, etc. Rare-earth tantalates with great potentials as new top ceramic materials were described in detail. In the end, the development directions of advanced top ceramic coatings, combining doping modification with preparation technology to regulate and control structure property of high-performance ceramic material, were put forward.
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Zhang, Shaowei. "High Temperature Ceramic Materials." Materials 14, no. 8 (April 17, 2021): 2031. http://dx.doi.org/10.3390/ma14082031.
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Thanks to their superior physiochemical properties such as high melting point, excellent mechanical properties, good thermal properties, and great corrosion/erosion resistance, high temperature ceramic materials (HTCM) find applications in a broad range of demanding areas or industrial sectors, e [...]
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Hotza, Dachamir, and Antonio Pedro Novaes de Oliveira. "New Silicate Glass-Ceramic Materials and Composites." Advances in Science and Technology 68 (October 2010): 1–12. http://dx.doi.org/10.4028/www.scientific.net/ast.68.1.
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New silicate glass-ceramic compositions have been investigated due to their interesting chemical, mechanical, thermal, and electrical properties. LZSA glass-ceramics based on -spodumene (Li2O•Al2O3•4-10SiO2) and zircon (ZrSiO4) crystalline phases have shown good chemical resistance, high bending strength as well as high abrasion resistance, when compared with traditional ceramic materials, and coefficient of thermal expansion from 4.6 to 9.110-6 °C-1. These features basically depend on the nature, size and distribution of the formed crystals as well as on the residual glassy phase. The nature of the formed crystalline phases and consequently the final properties can be controlled by modifying the chemical composition of the parent glass and also by adequate selection of the heat-treatment parameters. The classical fabrication of glass-ceramic materials consists on the preparation of monolithic glass components followed by heat treatments for crystallisation. However, this technology requires high investments and can be justified only for large production. A viable alternative could be the production of glass-ceramics processed from glass powders and consolidated by sintering using the same equipments of traditional ceramic plants. This work reports the manufacturing and characterization of glass-ceramic materials and composites processed by pressing, injection moulding, extrusion, casting, replication, and rapid prototyping.
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Porojan, Liliana, Roxana-Diana Vasiliu, Mihaela-Ionela Bîrdeanu, and Sorin-Daniel Porojan. "Surface Characterization and Optical Properties of Reinforced Dental Glass-Ceramics Related to Artificial Aging." Molecules 25, no. 15 (July 28, 2020): 3407. http://dx.doi.org/10.3390/molecules25153407.
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The development of various dental glass-ceramic materials and the evolution of novel processing technologies lead to an essential change in the clinical and technical workflow. The long-term success of a dental restoration treatment is defined by its durability, which is directly influenced by the oral environment. This study’s purpose was to evaluate the artificial aging behavior of nanostructured, respective microstructured ceramics related to surface topography, roughness, and optical properties. Six monolithic restoration materials were selected: milled lithium disilicate glass-ceramic (LDS-M) MT (medium translucency), hot-pressed lithium disilicate glass-ceramic (LDS-P) MT and HT (high translucency), milled zirconia-reinforced lithium silicate ceramic (ZLS-M) MT and hot-pressed zirconia-reinforced lithium silicate ceramic (ZLS-P) MT and HT, resulting n = 96 surfaces. All the samples were artificially aged by thermal cycling, and all investigations were made before and after thermal cycling. In terms of optical properties, differences recorded between ZLS and LDS ceramics are not significant. Thermal cycling increases the translucency of ZLS and LDS glass-ceramic materials significantly, with the most harmful effect on the pressed and polished samples. Micro- and nano roughness are significantly influenced by in vitro aging and a negative correlation was recorded. Glazed samples are characterized by significant rougher surfaces for all types of materials. On nanolevel, ZLS materials are significantly smoothed by thermal cycling.
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Sun, Yonggen, Yanhan Fei, Yanchun Wang, Yuhui Jin, Lanjun Du, Yuansheng Cheng, and Zhiming Du. "Preparation and properties of ZrO2-5CrMnMo composites by ceramic injection molding." Materials Express 11, no. 9 (September 1, 2021): 1594–601. http://dx.doi.org/10.1166/mex.2021.2058.
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ZrO2-5CrMnMo composites were fabricated by ceramic injection molding in this research. The hardness and wear properties of ZrO2 ceramic layer and 5CrMnMo substrate were investigated. Moreover, physical properties and microstructures of ZrO2 ceramic coatings were studied and the interfaces of composite samples were observed. The results illustrated that the interface was smooth and properly bonded, and it was concluded that the 5CrMnMo substrate ceramic layer could be provided effectively by ZrO2 ceramic coating. Thermal insulation and thermal shock cycle tests were carried out. The heat insulating property of ZrO2 ceramic coating was remarkable, and even better at a high temperature. The composite samples prepared at 1200 °C did not failed until after more than 68 thermal shocks. The main reasons of limiting the application of this composites so far were still the physical and thermodynamic mismatch between ceramics and steel. But the composite samples fabricated by ceramic injection molding showed excellent thermal shock resistance and high bonding strength in this work.
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Zach, Jiri, Martin Sedlmajer, and Jitka Hroudová. "Development of Building Elements with Thermal Insulation Filler Based on Secondary Raw Materials." Advanced Materials Research 649 (January 2013): 147–50. http://dx.doi.org/10.4028/www.scientific.net/amr.649.147.
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With increasing requirements for properties of envelope design in respect of thermal protection of buildings also requirements for building material properties have been growing. In case of ceramic shaped pieces for peripheral structures the way to further improvement of its thermal insulation properties is quite difficult. Generally thickness of interior groins can be reduced and its geometrical layout changed or the ceramics blocks dimensions increased and thus width of the masonry construction. Use of insulation filler integrated in block cavities is the alternative technology of production of insulation special shapes of high insulation properties. In these cases the ceramic fragment ensures the mechanical stability of the block and integrated insulation layer in smaller or bigger part (depending on its part) the thermal properties and eventually also the acoustic and insulation ones. The paper describes application possibilities of insulation materials based upon waste textile fibres as integrated layer in current masonry ceramic blocks of high utility properties.
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Chmielewski, M., D. Kalinski, and K. Pietrzak. "Properties Dependency of Alumina - Steel Joints on Bonding Technique." Advances in Science and Technology 45 (October 2006): 1614–19. http://dx.doi.org/10.4028/www.scientific.net/ast.45.1614.
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The development of technologies for joining ceramics and metals is connected with an introduction of new ceramic materials and new applications of ceramic-metal joints, to work in ever more difficult conditions. It concerns mainly ceramic-metal joints working at high and variable temperatures (a facing layer of burners, turbine vanes, etc.) or in a chemically aggressive environment (chemical apparatuses, purification plants). This paper presents the analysis of the influence of the bonding technique on thermal residual stresses generated in ceramic-metal joints and their properties. Technological bonding tests were made using well-known diffusion bonding and powder metallization techniques, and with elaborated sintered Al2O3-Cr gradient interlayer. Numerical calculations (the finite elements method) of the state of thermal residual stresses, as well as the verifying technological tests, were made for the following pair of materials: Al2O3 ceramics - heat resisting steel. There were also made tests of resistance for sudden temperature changes and for oxidation at high temperature. There was found a significant effect of the bonding techniques on the thermal residual stresses and properties of obtained alumina-steel joints.
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Silvestre, J., N. Silvestre, and J. de Brito. "An Overview on the Improvement of Mechanical Properties of Ceramics Nanocomposites." Journal of Nanomaterials 2015 (2015): 1–13. http://dx.doi.org/10.1155/2015/106494.
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Due to their prominent properties (mechanical, stiffness, strength, thermal stability), ceramic composite materials (CMC) have been widely applied in automotive, industrial and aerospace engineering, as well as in biomedical and electronic devices. Because monolithic ceramics exhibit brittle behaviour and low electrical conductivity, CMCs have been greatly improved in the last decade. CMCs are produced from ceramic fibres embedded in a ceramic matrix, for which several ceramic materials (oxide or non-oxide) are used for the fibres and the matrix. Due to the large diversity of available fibres, the properties of CMCs can be adapted to achieve structural targets. They are especially valuable for structural components with demanding mechanical and thermal requirements. However, with the advent of nanoparticles in this century, the research interests in CMCs are now changing from classical reinforcement (e.g., microscale fibres) to new types of reinforcement at nanoscale. This review paper presents the current state of knowledge on processing and mechanical properties of a new generation of CMCs: Ceramics Nanocomposites (CNCs).
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Abubakar, Muazu, Ayyankalai Muthuraja, Dipen Kumar Rajak, Norhayati Ahmad, Catalin I. Pruncu, Luciano Lamberti, and Ashwini Kumar. "Influence of Firing Temperature on the Physical, Thermal and Microstructural Properties of Kankara Kaolin Clay: A Preliminary Investigation." Materials 13, no. 8 (April 16, 2020): 1872. http://dx.doi.org/10.3390/ma13081872.
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In this study, natural deposits of Kankara kaolin clay were collected and investigated in order to determine physical, microstructural, thermal, and firing properties and assess clay’s suitability as starting material for various ceramic applications. Chemical analysis of the clay was performed using XRF. Mineralogical analysis and thermal analysis of the clay were conducted using XRD and thermogravimetric thermal analysis (TGA)/differential thermal analysis (DTA), respectively. In order to assess its ceramic behavior, the clay was fired at 900–1200 °C. Maturation characteristics of fired ceramics were assessed by measuring bulk density, apparent porosity, and shrinkage. It was found that main oxides in the clay are alumina, silica, and potassium oxide, while other oxides are present in trace quantities. Kaolinite, quartz, and illite are the phases found from the XRD results, while mullite ceramic phase formed at firing temperature above 1100 °C. Maturation tests showed that ceramic properties such as bulk density and shrinkage increase with temperature, while apparent porosity decreases with temperature. The results presented in this study prove that the clay is an appropriate material for producing traditional ceramics.
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Savvova, О. V., O. I. Fesenko, V. D. Timofeеv, and Ya V. Poviderna. "Investigation of the thermal properties of mullite-cordierite materials." Scientific research on refractories and technical ceramics 118 (July 11, 2018): 111–18. http://dx.doi.org/10.35857/2663-3566.118.10.
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Based on the analysis of existing mullite-cordierite sitalls, the need to create high-strength materials of this type for individual and local protection against high-speed loads has been determined. They should be characterized by lower cost, due to low-temperature short-term heat treatment using domestic raw materials. An important aspect of ensuring the effective protective effect of an armor-element, in addition to its armor resistance and survivability, is the ability to withstand the effects of open flame and combustible mixtures, which is determined by the thermal properties of the sitalls. The aim of this work is to study the thermal properties, namely thermal expansion coefficient and fire resistance, high strength mullite-cordierite glass-ceramics that they are developed by us earlier. The temperature coefficient of linear expansion was determined using a quartz vertical dilatometer QVD-5A (ASTM C 372-94 (2007)), fire resistance according to GOST 33000—2014.
According to X-ray diffraction and differential thermal analyzes, the experimental samples were divided into two groups according to the formation mechanism of structure and phase composition of glass materials during heat treatment. For each of the materials groups, the influence of the chemical and phase compositions on the thermal coefficient of linear expansion of the original mullite-cordierite glass materials and glass-ceramic materials (sitalls) thermally treated using two-stage heat treatment was determined. The study of the fire resistance of the developed glass-ceramic materials made it possible to establish that they withstand the thermal load in a certain mode for 360 minutes.
It has been established that providing high thermal- and fire resistance (RE 360 (h)) is a determining factor in the production of hardened glass crystalline materials that are able to resist to thermal destroying at sharp temperature change.
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Manankov, A. V., and E. R. Gasanova. "PHYSICOCHEMICAL AND THERMOPHYSICAL PROPERTIES OF GLASS-CERAMIC MATERIALS DEPENDING ON THEIR COMPOSITION." Vestnik Tomskogo gosudarstvennogo arkhitekturno-stroitel'nogo universiteta. JOURNAL of Construction and Architecture, no. 1 (April 13, 2018): 175–86. http://dx.doi.org/10.31675/1607-1859-2018-20-1-175-186.
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The paper deals with rock glass-ceramic materials in CaO-MgO-FeO-Al2O3-SiO2system and studies their thermal and thermal diffusivity, viscosity, thermal expansion coefficients, crystallization temperature range. The suggested thermodynamic and kinetic dependences are used in trying out the temperature-time parameters of glass-ceramic material production. Industrial and local natural waste are used to design 19 glass-ceramic compositions which underwent semicommercial testing.
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Narkevica, Inga, Jurijs Ozolins, Kristaps Rubenis, Janis Kleperis, Janis Locs, and Liga Berzina-Cimdina. "The influence of thermal treatment conditions on the properties of TiO2 ceramics." World Journal of Engineering 11, no. 2 (June 1, 2014): 131–38. http://dx.doi.org/10.1260/1708-5284.11.2.131.
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The influence of thermal treatment conditions on titanium dioxide ceramics phase transformation, microstructure, physico-mechanical and electrical properties was studied. TiO2 ceramic was prepared using extrusion technology and thermal treatment in air and subsequent annealing under high vacuum conditions. It has been observed that intense TiO2 ceramic mass sintering occurs over the temperature ranging from 950 °C to 1100 °C. It is accompanied by crystallographic modification change from anatase to rutile. Ceramic sample annealing in vacuum causes formation of nonstoichiometric titanium oxide ceramics and as a result electrical conductivity of the material significantly increases. Using extrusion process relatively dense and mechanically resistant ceramic material can be obtained that can be used in different technological processes.
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Iuga, Maria, and Friedrich Raether. "Simulation of the Thermoelastic Properties of Sintered Ceramics." Advances in Science and Technology 45 (October 2006): 89–94. http://dx.doi.org/10.4028/www.scientific.net/ast.45.89.
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Many ceramic materials are composed of various phases, which can differ in their individual thermal, elastic or electrical properties by orders of magnitude. The microstructural arrangement of the phases controls important material properties of the composite. To simulate these macroscopic material properties from the material properties of the constituting phases, a 3-D FEM model is used. The key for an adequate description of real materials is the accurate threedimensional modeling of their microstructure. Basic morphological parameters of many ceramics are reflected by a modified Voronoi model, e.g.: the volume fractions, grain size ratios and contiguity of the phases. By automatically generating thousands of test structures and comparing them to quantitative data derived from image analysis of scanning electron micrographs, structures are selected which closely fit to the microstructure of experimental samples. The model considerations are illustrated on two types of bi-continuous ceramic materials, a porous alumina (Al2O3) and a dense zirconia toughened alumina (ZTA) ceramic. Using different volume fractions of the phases, Voronoi type microstructures and truncated sphere models are exemplified. For these two ceramic systems, elastic moduli and thermal conductivity are calculated and compared to experimental data of samples of the respective microstructure.
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Baikov, I. R., O. V. Smorodova, and S. V. Kitaev. "Investigation of properties of liquid ceramic thermal insulation materials." Nanotechnologies in Construction A Scientific Internet-Journal 10, no. 5 (October 24, 2019): 106–21. http://dx.doi.org/10.15828/2075-8545-2018-10-5-106-121.
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Rundans, Maris, Gaida Sedmale, Ingunda Sperberga, and Ina Pundiene. "Development of Cordierite Ceramics from Natural Raw Materials." Advances in Science and Technology 89 (October 2014): 94–99. http://dx.doi.org/10.4028/www.scientific.net/ast.89.94.
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Cordierite ceramics are known for their low CTE and high compressive strength values which affords them place in fields where demanding thermal and mechanical properties are required. Development of such ceramics is greatly dependent on materials used. If raw materials are used formation of additional phases and pore/glass formation is expected. The purpose of this research is to examine the process of cordierite development from mixed compositions formed from precursors of the natural raw materials as illite clay, dolomite and quartz sand and synthetic additives – MgO, γ-Al2O3 and their influence on thermal and mechanical properties. It is verified that the addition of 10 wt.% of illite clay and about 20-21 wt.% dolomite in staring compositions at the sintering temperature of 1200 °C results in the development of dense ceramic material with perfect-shaped crystalline cordierite phase and secondary anorthite phase. Sintered cordierite ceramics have been tested, among other properties, for their compressive strength, coefficient of thermal expansion and modulus of elasticity after 20 cycles of thermal shock treatment.
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Liu, Jiang Bo, Zhou Fu Wang, Hao Liu, Xi Tang Wang, and Yan Ma. "Mechanical and Thermal Properties of MgAl2O4-Y3Al5O12 Ceramic Composites." Solid State Phenomena 281 (August 2018): 255–60. http://dx.doi.org/10.4028/www.scientific.net/ssp.281.255.
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MgAl2O4-Y3Al5O12 ceramic composites were prepared using fused spinel and a Y2O3 micropowder as the raw materials. The microstructure and thermal properties of the composites were characterized by X-ray diffraction, scanning electron microscopy, laser flash diffusivity measurements. The mechanical properties were also determined. MgAl2O4-Y3Al5O12 ceramic composites are composed of spinel and garnet structures. The thermal expansion coefficients of MgAl2O4 and MgAl2O4-Y3Al5O12 ceramics are similar. The measured thermal diffusivity decreases gradually with increasing temperature. Thermal conductivity of the composites is in the range of 3.3-5.8 W∙m-1∙K-1 from 400°C to 900°C.
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Jeon, Jae Ho, Hai Tao Fang, Zhong Hong Lai, and Zhong Da Yin. "Development of Functionally Graded Anti-Oxidation Coatings for Carbon/Carbon Composites." Key Engineering Materials 280-283 (February 2007): 1851–56. http://dx.doi.org/10.4028/www.scientific.net/kem.280-283.1851.
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The concept of functionally graded materials (FGMs) was originated in the research field of thermal barrier coatings. Continuous changes in the composition, grain size, porosity, etc., of these materials result in gradients in such properties as mechanical strength and thermal conductivity. In recent years, functionally graded structural composite materials have received increased attention as promising candidate materials to exhibit better mechanical and functional properties than homogeneous materials or simple composite materials. Therefore the research area of FGMs has been expending in the development of various structural and functional materials, such as cutting tools, photonic crystals, dielectric and piezoelectric ceramics, thermoelectric semiconductors, and biomaterials. We have developed functionally graded structural ceramic/metal composite materials for relaxation of thermal stress, functionally graded anti-oxidation coatings for carbon/carbon composites, and functionally graded dielectric ceramic composites to develop advanced dielectric ceramics with flat characteristics of dielectric constant in a wide temperature range. This paper introduces functionally graded coatings for C/C composites with superior oxidation resistance at high temperatures.
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Varfolomeev, M. S., and G. I. Shcherbakova. "The refractory compositions designing for the highly-heat-resistant ceramic products in the foundry practice." NOVYE OGNEUPORY (NEW REFRACTORIES), no. 6 (July 26, 2018): 18–23. http://dx.doi.org/10.17073/1683-4518-2018-6-18-23.
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The sintering peculiarities of the ceramic materials which had been prepared by means of semidry pressing are investigated in the article. The fillers were the yttrium oxide Y2O3 and the fused corundum α-Al2O3, the bonding phase was the aluminoxane addition either pure or modified by the yttrium and magnesium compounds. We investigated the processes occurring at the examined ceramics sintering at different temperatures and their influence on the obtained ceramics properties. The phase composition, the thermal and mechanical properties of the test samples at 1500 °C are presented. The produced test ceramic crucibles have advanced thermal resistance and stability against the thermal cycling. The possibility is regarded to use the developed ceramic crucibles for melting and casting of the chemically reactive highly-heat-resistant metals and alloys.
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Suryanarayana, D. "Thermally Conductive Ceramics for Electronic Packaging." Journal of Electronic Packaging 111, no. 3 (September 1, 1989): 192–98. http://dx.doi.org/10.1115/1.3226533.
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A survey was conducted on the physical properties of several new ceramic systems, such as carbides, borides, oxides, and nitrides, as they appeared in recent literature, and they are briefly reviewed. A few new ceramic materials, such as BeO, BN, AlN, and SiC-BeO, possess superior thermal properties when compared to the alumina (Al2O3) ceramics used in electronic packaging. Among these, the aluminum nitride (AlN) has emerged as unique material that can replace alumina in future electronic packaging for improved thermal performance and reliability.
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Vasile, Bogdan Stefan, Alexandra Catalina Birca, Vasile Adrian Surdu, Ionela Andreea Neacsu, and Adrian Ionut Nicoară. "Ceramic Composite Materials Obtained by Electron-Beam Physical Vapor Deposition Used as Thermal Barriers in the Aerospace Industry." Nanomaterials 10, no. 2 (February 20, 2020): 370. http://dx.doi.org/10.3390/nano10020370.
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This paper is focused on the basic properties of ceramic composite materials used as thermal barrier coatings in the aerospace industry like SiC, ZrC, ZrB2 etc., and summarizes some principal properties for thermal barrier coatings. Although the aerospace industry is mainly based on metallic materials, a more attractive approach is represented by ceramic materials that are often more resistant to corrosion, oxidation and wear having at the same time suitable thermal properties. It is known that the space environment presents extreme conditions that challenge aerospace scientists, but simultaneously, presents opportunities to produce materials that behave almost ideally in this environment. Used even today, metal-matrix composites (MMCs) have been developed since the beginning of the space era due to their high specific stiffness and low thermal expansion coefficient. These types of composites possess properties such as high-temperature resistance and high strength, and those potential benefits led to the use of MMCs for supreme space system requirements in the late 1980s. Electron beam physical vapor deposition (EB-PVD) is the technology that helps to obtain the composite materials that ultimately have optimal properties for the space environment, and ceramics that broadly meet the requirements for the space industry can be silicon carbide that has been developed as a standard material very quickly, possessing many advantages. One of the most promising ceramics for ultrahigh temperature applications could be zirconium carbide (ZrC) because of its remarkable properties and the competence to form unwilling oxide scales at high temperatures, but at the same time it is known that no material can have all the ideal properties. Another promising material in coating for components used for ultra-high temperature applications as thermal protection systems is zirconium diboride (ZrB2), due to its high melting point, high thermal conductivities, and relatively low density. Some composite ceramic materials like carbon–carbon fiber reinforced SiC, SiC-SiC, ZrC-SiC, ZrB2-SiC, etc., possessing low thermal conductivities have been used as thermal barrier coating (TBC) materials to increase turbine inlet temperatures since the 1960s. With increasing engine efficiency, they can reduce metal surface temperatures and prolong the lifetime of the hot sections of aero-engines and land-based turbines.
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Xu, Xianghong, Wenjun Yuan, and Cheng Tian. "Dependence of Thermal Shock Crack on Specimen Width for Ceramic Materials." International Journal of Applied Mechanics 08, no. 03 (April 2016): 1650042. http://dx.doi.org/10.1142/s1758825116500423.
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Knowledge of size effect of thermal shock properties of ceramics is a prerequisite in engineering applications. In the present study, the size effect of the cracking in the ceramic materials subjected to water quenching has been experimentally conducted. Based on the Rizk model, the equivalent specimen width of the elastic strip with cracks is introduced and modified to describe the effect of cracks on the deformation of the elastic strip underwater quenching. It is found that the simulation obtained from the proposed modified model is in good agreement with the experimental results. And the reasons for the size effect of crack depth and crack growth into the compressive region are well analyzed by theoretical results. The proposed model is expected to provide a powerful tool to characterize and predict the size effect on thermal shock crack of ceramic materials.
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Švinka, Ruta, and Visvaldis Švinka. "Celtniecības keramika, keramzīts un keramiskie sorbenti." Materials Science and Applied Chemistry 35 (November 1, 2018): 30–61. http://dx.doi.org/10.7250/msac-2018-0002.
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Vēsturiski viena no silikātu tehnoloģijas katedras pamattēmām vienmēr ir bijusi celtniecības materiālu pētīšana un jaunu materiālu izstrāde. Tie ir gan keramikas materiāli, gan materiāli uz neorganisko javu saistvielu bāzes. Ir analizētas un salīdzinātas šo materiālu īpašības: siltuma vadāmība, līdzsvara mitrums, mehāniskās īpašības. Salīdzinātas rūpnieciskos apstākļos un laboratorijā iegūtu dažādu Latvijas mālu keramikas materiālu īpašības un struktūra. Aprakstīta dažu rūpniecisko atkritumu ietekme uz keramikas materiālu īpašībām. Aprakstīta arī jauna keramikas materiāla keramzīta ražošanas tehnoloģija – vienas stadijas paņēmiens, kas ļauj paplašināt keramzīta ražošanai izmantojamo izejvielu bāzi un variēt keramzīta īpašības atkarībā no paredzamā pielietojuma. Pētīta dažādu Latvijas mālu noderība porainu keramisku sorbentu iegūšanai, par poru veidotājiem izmantojot organiskas dabas ražošanas atkritumus. Analizēta keramikas virsmas apstrāde, piemēram, apstarošana ar paātrinātajiem elektroniem un nanodaļiņu pārklājumi, keramikas granulu sorbcijas spējas palielināšanai un noderība fotokatalītiskai organisku piesārņotāju sadalīšanai.Building Ceramics, Expanded Clay, and Ceramic SorbentsInvestigation and development of new building materials historically was one of base research fields in the Institute of Silicate Materials. These are ceramic materials and materials based on inorganic binders. These materials have both advantages and disadvantages. Properties of these materials, such as thermal conductivity, equilibrium humidity and mechanical properties, are analysed and compared. Properties and structure of ceramic materials produced from Latvian clays in the laboratory and industrially were compared. Influence of addition of some industrial waste on the properties of ceramic materials was described. A new technology for obtaining expanded clay pellets was developed. It is a one-step technology that makes it possible to extend the basis of raw materials for production of expanded clay pellets and to produce pellets with different properties depending on the possible practical use. Usefulness of different Latvian clay for the production of porous ceramic sorbents was investigated. Organic industrial waste was added to function as pore former. A treatment of ceramic surface by irradiation with accelerated electrons or coating with nanoparticles was analysed. An increase of sorption activity of ceramic pellets or usefulness for the photocatalytic decomposition of organic pollution was the goal of the aforementioned treatment.Keywords – ceramics, expanded clay, equilibrium moisture, thermal insulation, ceramic granules, sorbents.
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Negahdari, Zahra, M. Solati, and A. Saberi. "Influence of Slurry Formulation on Mechanical Properties of Reticulated Porous Ceramic." Advances in Science and Technology 45 (October 2006): 2061–66. http://dx.doi.org/10.4028/www.scientific.net/ast.45.2061.
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Increased processing pressure has resulted in need for the industry to optimize mechanical properties of ceramic foam filters used for molten metal processing. This paper will summarize the effect of ceramic slurry formulation on mechanical properties of reticulated porous ceramics processed by replica method. Commercial polyurethane sponge materials were chosen as a template to produce the RPC (reticulated porous ceramic) from a shear thinning multi component aqueous slurry composed of alumina, SiC, colloidal silica and some different additives. Thermal transformation sequence of the mixtures, resultant macrostructure and microstructure, relative density, grain morphology, phase composition, and mechanical strength of the sintered porous ceramics were investigated. Mechanical properties of struts were investigated by a theoretical model. The RPC had its maximum strength when Alumina/SiC weight ratio was 4.4. Such materials sintered at 1650° C in air, due to their excellent functional properties, are suitable for application as molten metal filter.
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Zheng, Shu Long, Hui Wang, and Qi Tang. "Research on Thermal Comfort of Crystal Sandstone Light Ceramics." Applied Mechanics and Materials 71-78 (July 2011): 1044–48. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.1044.
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The thermal properties of the crystal sandstone light ceramic products, nature sandstones, tiles and composite floorboards were analyzed and compared in detail by scanning electron microscope (SEM) and thermal simulation method. The results show that the different thermal properties are the main factors which lead to the different thermal comfort to these materials. It is analyzed in theory that the good thermal comforts of the crystal sandstone light ceramics are come from the low thermal conductivity and low density mainly. And the thermal simulation is a reference method on the thermal comfort research of architectural ceramics.
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Liu, Chang, De Chang Jia, Sheng Jin Wang, and Wang Cui. "Properties of h-Bn/Si3N4 Composite Ceramics Fabricated by Gel-Casting." Materials Science Forum 745-746 (February 2013): 517–22. http://dx.doi.org/10.4028/www.scientific.net/msf.745-746.517.
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h-BN/Si3N4 composite ceramics were fabricated by gel-casting method and pressureless sintering using Si3N4 and h-BN as raw materials. The effect of h-BN on the microstructure and comprehensive properties of h-BN/Si3N4 ceramic were investigated. The results showed that the introduction of h-BN hindered the densification of h-BN/Si3N4 ceramic as well as the transformation of α-Si3N4 to β-Si3N4. The mechanical properties of Si3N4 based ceramics decreased with the increase of h-BN content, while the thermal property, dielectric properties and machinability increased.
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Spiliotis, Xenofon, Vayos Karayannis, Stylianos Lamprakopoulos, Konstantinos Ntampegliotis, and George Papapolymerou. "SYNTHESIS AND CHARACTERIZATION OF GREENER CERAMIC MATERIALS WITH LOWER THERMAL CONDUCTIVITY USING OLIVE MILL SOLID BYPRODUCT." EUREKA: Physics and Engineering 1 (January 31, 2020): 96–106. http://dx.doi.org/10.21303/2461-4262.2020.001116.
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In the current research, the valorization of olive mill solid waste as beneficial admixture into clay bodies for developing greener ceramic materials with lower thermal conductivity, thus with increased thermal insulation capacity towards energy savings, is investigated. Various clay/waste mixtures were prepared. The raw material mixtures were characterized and subjected to thermal gravimetric analysis, in order to optimize the mineral composition and maintain calcium and magnesium oxides content to a minimum. Test specimens were formed employing extrusion and then sintering procedure at different peak temperatures. Apparent density, water absorption capability, mechanical strength, porosity and thermal conductivity were determined on sintered specimens and examined in relation to the waste percentage and sintering temperature. The experimental results showed that ceramic production from clay/olive-mill solid waste mixtures is feasible. In fact, the mechanical properties are not significantly impacted with the incorporation of the waste in the ceramic body. However, the thermal conductivity decreases significantly, which can be of particular interest for thermal insulating materials development. Furthermore, the shape of the produced ceramics does not appear to change with the sintering temperature increase.
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Minota-Yepes, Isabel Cristina, Román Álvarez-Roca, and Fernando Andrés Londoño-Badillo. "Review: Densification process of ceramic materials." Respuestas 25, no. 2 (May 1, 2020): 199–212. http://dx.doi.org/10.22463/0122820x.2964.
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Ceramics has played an important role in the technological and socio-economic development of humanity, so that they can be used to identify different historical periods of the humanity. Babylonians, Greek, Andalusian, among other cultures have used the ceramics and developed several methods to improve the products obtained by pottery. Generally, the ceramics can be divided into two big areas, traditional and structural ceramics. Ceramics manufactured with clay, Traditional Ceramics, currently they are being studied in the improvement of structural, abrasives, cement, refractory, among other materials. On the other hand, the ceramics developed as a result of new technologies and the exploitation of natural resources, Structural Ceramics, they are a great interest for the science of ceramic materials due to the development of ceramics with properties that incorporate attributes of various materials in only one material, in addition to the contributing to the phenomenological study at a scientific level. Advances in the processes of densification and doping of these materials have allowed to obtain ceramics with high mechanical resistance, high hardness, high resistance to attrition and corrosion, good chemical and thermal stability; features that have directly influenced the type of applications such as bulletproof vests, transparent shields, high temperature electrical insulators, superconducting devices, electronic materials among other applications
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Dong, Wei Xia, Qi Fu Bao, Xing Yong Gu, and Yan Chun Huang. "Effect of Cerium Oxide on Sinterability, Microstructure and Properties of Anorthite-Based Glass/Ceramic Composites." Key Engineering Materials 544 (March 2013): 52–55. http://dx.doi.org/10.4028/www.scientific.net/kem.544.52.
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The properties of anorthite-based glass/ceramic with different amounts of CeO2 addition had been investigated in this paper. The glass/ceramics with small amounts of CeO2 addition could be well sintered at 850~900°C. The water absorption was examined to evaluate the sintering behavior of the samples. The crystalline phase,microstructure, dielectric properties, thermal expansion and bending strength were characterized by X-Ray diffraction (XRD), scanning transmission electron microscope (SEM), impedance materials analyzer, thermal expansion analyzer and flexural strength analyzer. The results showed the 1wt % CeO2-doped glass/ceramics sintered at 900 °C have optimum properties of ε = 6.282, tanθ = 2.18×10-3 at 1 MHz and a thermal expansion coefficient of 3.32×10-6 °C-1 (25~500 oC) matched with silicon chip (3.4×10-6 °C -1). Obviously, CeO2 could be used as a suitable sintering aid that improves densification of the glass/ceramic composites.
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Ejaz, Noveed, Liaqat Ali, Akhlaq Ahmad, Muhammad Mansoor, Muhammad Muneeb Asim, Abdul Rauf, and Khalid Mehmood. "Thermo-Physical Properties Measurement of Advanced TBC Materials with Pyrochlore and Perovskite Structures." Key Engineering Materials 778 (September 2018): 236–44. http://dx.doi.org/10.4028/www.scientific.net/kem.778.236.
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Thermal barrier coatings (TBCs) serve as thermal insulator in the hot region of an aircraft engine. Besides this, it also protects the underlying metal surface from the harsh corrosive and eroding environment. The associated lower thermal conductivity of TBC ceramic materials plays an important role in the improvement of thermal efficiency of the engine in term of increased combustion temperature and power. The thermal conductivity of the conventional yttria stabilized zirconia (YSZ) and three advanced ceramic materials with perovskite (CaZrO3) and pyrochlore structure (La0.75Nd0.25)2Zr2O7 & Nd2Ce2O7) have been determined using differential scanning calorimetry (DSC). With thin metallic disk on the ceramic samples of different heights were heated / scanned using a standard DSC apparatus. The results were evaluated for the thermal conductivity measurement using well established procedure /calculations. The analyzed results were compared with that of other techniques given by other researchers and found to be in good agreement with an error of 10-15%. The result of coefficient of thermal expansion (CTE) that was measured using a dilatometer up to 1273°K has also given.
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Kubiliene, Diana, Audrone Sankauskaite, Aušra Abraitienė, Sigitas Krauledas, Rimantas Barauskas, and Rimantas Barauskas. "Investigation of Thermal Properties of Ceramic-containing Knitted Textile Materials." Fibres and Textiles in Eastern Europe 24, no. 3(117) (April 30, 2016): 63–66. http://dx.doi.org/10.5604/12303666.1185481.
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Ellis, Sarah, Carl Romao, and Mary White. "Near-Zero Thermal Expansion in Freeze-Cast Composite Materials." Ceramics 2, no. 1 (February 13, 2019): 112–25. http://dx.doi.org/10.3390/ceramics2010011.
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Most materials expand when heated, which can lead to thermal stress and even failure. Whereas thermomiotic materials exhibit negative thermal expansion, the creation of materials with near-zero thermal expansion presents an ongoing challenge due to the need to optimize thermal and mechanical properties simultaneously. The present work describes the preparation and properties of polymer–ceramic composites with low thermal expansion. Ceramic scaffolds, prepared by freeze-casting of low-thermal-expansion Al2W3O12, were impregnated with poly(methylmethacrylate) (PMMA). The resulting composites can have a coefficient of thermal expansion as low as 2 × 10−6 K−1, and hardness values of 4.0 ± 0.3 HV/5 (39 ± 3 MPa) and 16 ± 3 HV/5 (160 ± 30 MPa) parallel and perpendicular to the ice growth, respectively. The higher hardness perpendicular to the ice growth direction indicates that the PMMA is acting to improve the mechanical properties of the composite.
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Gurieva, Victoria A., and Aleksandr V. Doroshin. "Building Ceramics Based on Carbonate-Containing Raw Materials." Solid State Phenomena 284 (October 2018): 910–15. http://dx.doi.org/10.4028/www.scientific.net/ssp.284.910.
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The results of the production of wall ceramics based on the composition of low-melting argillaceous raw materials - loam and fuel slag in an amount of 10-30% by the method of semi-dry pressing are presented. Pre-baking and calcining properties of clay materials are investigated, the results of x-ray diffraction analysis and differential thermal analysis of the raw materials are given. The results obtained by the method of mathematical planning of the experiment made it possible to develop a model of ceramic bricks of the racial composition, to construct empirical dependencies in the system «technogenic product-technological factor-property» and to establish the influence of the addition of fuel slag on the basic physical and mechanical properties of wall ceramics: strength, density, water absorption , shrinkage. The results of studies of the modifying role of the container glass in the processes of pyrogenic synthesis of clay-slag masses and its effect on the preparation of a ceramic shard of a racial composition with the required properties are shown.
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Effting, C., S. Güths, and O. E. Alarcon. "EVALUATION OF THE THERMAL COMFORT IN CONTACT WITH CERAMIC TILES." Revista de Engenharia Térmica 5, no. 2 (December 31, 2006): 92. http://dx.doi.org/10.5380/reterm.v5i2.61856.
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In places where people are bare feet, the thermal sensation of cold or hot depends on the environmental conditions and material properties including its microstructure and crustiness surface. The uncomforting can be characterized by heated floor surfaces in external environments which are exposed to sun radiation (swimming polls areas) or by cold floor surfaces in internal environments (bed rooms, path rooms). The property named thermal effusivity which defines the interface temperature when two semiinfinite solids are putted in perfect contact. The introduction of the crustiness surface on the ceramic tiles interferes in the contact temperature and also it can be a strategy to obtain ceramic tiles more comfortable. Materials with low conductivities and densities can be obtained by porous inclusion are due particularly to the processing conditions usually employed. However, the presence of pores generally involves low mechanical strength. This work has the objective to evaluate the thermal comfort of ceramics floor obtained by incorporation of refractory raw materials (residue of the polishing of the porcelanato) in industrial atomized ceramic powder, through the thermal and mechanical properties. The theoretical and experimental results show that the porosity and crustiness surface increases; there is sensitive improvement in the comfort by contact.
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Tharajak, Jirasak, and Noppakun Sanpo. "The Effect of Sintering Temperature on Physical Properties of Leucite Ceramics." Applied Mechanics and Materials 891 (May 2019): 214–18. http://dx.doi.org/10.4028/www.scientific.net/amm.891.214.
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Leucite has been widely used as a constituent of dental ceramics to modify the coefficient of thermal expansion. This is most important where the ceramic is to be fused or baked onto metal. However, its physical property was unpredictable since it was sensitive to several parameters such as sintering temperature and concentration of raw materials. In this research study, leucite ceramic particles were synthesized by in-house sol-gel process. The morphology and size of our synthesized leucite particles were analyzed by SEM, vicker hardness and XRD, respectively. It was revealed that the sintering temperature played the important role on several properties of leucite ceramic particles.
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Bucko, Miroslaw, Agnieszka Wilk, Jerzy Lis, Anna Toczek, and Lucjan Kozielski. "Photoluminescence and electrical properties in Pr-modified (Ba1-xCax)TiO3 multifunctional ceramics." Processing and Application of Ceramics 14, no. 1 (2020): 77–82. http://dx.doi.org/10.2298/pac2001077b.
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Mechanoluminescence materials, characterized with non-thermal light emission in response to mechanical stimuli, can have many applications in direct conversion of mechanical energy into light energy. The aim of this study was to develop wet chemistry approaches for the synthesis of the finest ceramic powders of barium calcium titanate for the use in the production of a mechanoluminescent detector. Wet chemistry route allows the control of the particle size of ceramic materials up to several nanometers. For the first time luminescence was recorded in Ba0.9Ca0.1TiO3 ceramics despite reports that light emission in BCT is possibly only over 23% of calcium content. The resulting ceramics showed high relative density, reasonable ferro and dielectric properties, and red light emission can be observed with the naked eye.
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Galán-Arboledas, R. J., and Salvador Bueno. "Production of Ceramic Materials Using only Waste as Raw Materials." Key Engineering Materials 663 (September 2015): 62–71. http://dx.doi.org/10.4028/www.scientific.net/kem.663.62.
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From a selection of inorganic industrial waste (screen glass, steelworks ashes, coal power plant ashes, biomass power plant ash and sludge from cutting marble industry) and a waste with organic fraction (diatomaceous earth from oil filtration) it is expected to obtain ceramic materials with properties similar to those of ceramic materials used in construction and porous materials with thermal insulating capability. The ternary phase equilibrium diagram SiO2-Al2O3-CaO has been used as the main tool for the formulation of these materials. The dynamic sintering study was carried out using dilatometry techniques (DIL), thermo gravimetric analysis and differential scanning calorimetry (TG-DSC). Characterization of the manufactured material allows determining a set of basic technological properties such as fired bulk density, water absorption capacity and bending strength, in addition to thermal conductivity and microstructure by SEM-EDX, in order to obtain the necessary data to determine technical feasibility.
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Ерофеев, В., Vladimir Erofeev, А. Родин, Aleksandr Rodin, А. Кравчук, A. Kravchuk, А. Ермаков, and A. Ermakov. "PHYSICO-MECHANICAL AND THERMOPHYSICAL PROPERTIES OF FOAM- GLASS CERAMICS BASED ON SILICA ROCK." Bulletin of Belgorod State Technological University named after. V. G. Shukhov 4, no. 5 (April 19, 2019): 8–15. http://dx.doi.org/10.34031/article_5cd6df461d0fd5.98177374.
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Obtaining the foam-glass ceramic building materials bypassing the process of high-temperature glass melting and the use of local rocks as raw materials, which can significantly reduce the cost of the final product, is an urgent task of modern building materials science. The aim of this work is to study the physical, mechanical and thermal properties of foam- glass ceramic building materials obtained by one heating of the mixture consisting of silica-containing rock (tripoli) and soda ash. The developed heat-insulating building materials have an average density of 200 to 600 kg/m3, compressive strength of 1.2 to 9.8 MPa, thermal conductivity of 0.053 to 0.065 W/m °C. Studies establishes a rational ratio of components in the composition of foam glass ceramics based on silica rock. In the production of foam materials, the heating rate of the charge should vary from 3 to 4.5 ° C / min, and the maximum heating temperature from 800 to 850 ° C. The developed material will expand the range of thermal insulation building materials and can be used in the construction of industrial and civil facilities, nuclear power plants, in the gas and oil industry.
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Honda, Sawao, Hiroaki Tanaka, and Hideo Awaji. "Estimation of Thermal Shock Resistance by Infrared Radiation Heating and Water Flow Cooling Techniques." Key Engineering Materials 317-318 (August 2006): 339–42. http://dx.doi.org/10.4028/www.scientific.net/kem.317-318.339.
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Thermal shock is a mechanism often leading to failure of ceramic materials that may occur during rapid heating or cooling. These tests were performed in order to compare the thermal shock resistance of ceramic materials by cooling with that of the heating method and hence to evaluate parameters such as thermal shock strength (R1c) and thermal shock fracture toughness (R2c). During the present study, thermal shock resistance of alumina and mullite ceramics was estimated experimentally and theoretically using the thermal shock parameters. The critical thermal stress at the onset of thermal shock fracture was calculated using fracture time, which is measured by an acoustic emission. Results show that thermal shock parameters of alumina specimens decreased with increasing temperature of fracture point. This effect can be attributed to the temperature dependence of the thermal properties. The experimental values of thermal shock parameters evaluated by IRH and WFC techniques were in good agreement at the temperature of fracture point. The thermal shock parameters enabled the definition of a unified thermal shock resistance of ceramics, which is independent of the nature of the testing techniques.
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Švinka, Visvaldis, and Ruta Švinka. "Augsti poraina oksīdu keramika." Materials Science and Applied Chemistry 35 (November 1, 2018): 86–111. http://dx.doi.org/10.7250/msac-2018-0004.
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Silikātu materiālu institūtā kopš 2004. g. tiek veikti pētījumi par augsttemperatūras augsti porainu oksīdu keramiku, kas iegūta ar koncentrētas oksīdu pulveru suspensijas liešanas paņēmienu. Poru veidošanās notiek ķīmiskas reakcijas ceļā starp metāliska alumīnija pulveri un ūdeni bāziskā vidē, kur suspensijas pH ir 9,5–10,8. Tādā veidā netiek emitēts CO2, kas parasti notiek, iegūstot keramikas materiālus ar paaugstinātu porainību.Laikā kopš 2007. g. sintezēti materiāli un veikti pētījumi vairākās augsttemperatūras oksīdu sistēmās: cirkonija oksīdu saturošā (promocijas darbs, G. Buļa, Cirkonija oksīdu saturoša augsttemperatūras putu keramika, 2008. g.), korunda- mullīta sistēmā (promocijas darbs, L. Mahņicka-Goremikina, Sintēzes apstākļu un leģējošu piedevu ietekme uz porainas augsttemperatūras oksīdu keramikas īpašībām un struktūru, 2015. g.), alumīnija oksīda sistēmā ar dažādām piedevām (promocijas darbs, I. Zaķe-Tiļuga. Mullītu veidojošu piedevu ietekme uz porainas alumīnija oksīda keramikas īpašībām, 2015. g.; nepabeigts promocijas darbs A. Butlers, Karstumizturīga filtrējoša keramika; maģistra darbs, J. Bobrovika, Augsti poraina siltumizolējoša kordierīta keramika). Pētītie materiāli paredzēti, lai izmantotu tos kā siltumizolējošus materiālus dažādām augsttemperatūras siltuma ierīcēm un arī karstumizturīgiem filtriem.Highly Porous Oxide CeramicsInvestigations of highly porous high temperature ceramic produced by slip casting from concentrated suspensions of raw materials were carried out in the Institute of Silicate Materials since 2004. Pores form due to chemical reaction of metallic aluminium powder with water in basic medium with pH 9.5–10.8. Using this method emission of carbon oxide that usually accompanies fabrication of porous ceramics is avoided. The following investigations in high temperature oxide systems have been carried out since 2007:zirconia containing materials – promotion work by Gerda Bula “Zircon oxide containing high temperature foam ceramic”, 2008;corundum–mullite materials – promotion work by Ludmila Mahnicka- Goremikina “Influence of synthesis conditions and additives on the structure and properties of porous high temperature ceramics”, 2015;alumina materials with various additives – promotion work by Ieva Zake-Tiluga “The effect of mullite-forming additives on the properties of porous alumina ceramics”, 2015;titania containing corundum–mullite materials;cordierite ceramic materials.The goals of these investigations were to obtain of high temperature insulating materials and ceramic filters for filtration of hot and aggressive liquids. Properties of ceramics, such as dependence of thermal conductivity on the temperature and thermal shock durability, were determined.Keywords: aluminium oxide, zirconium oxide, titanium oxide, kaolin, talcum, cordierite, nanopowders, thermal insulation, thermal shock resistance.
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Zegardło, Bartosz, and Anna Halicka. "Analysis of thermal properties of concrete made using aggregate from sanitary ceramic wastes." Budownictwo i Architektura 9, no. 2 (December 11, 2011): 039–49. http://dx.doi.org/10.35784/bud-arch.2242.
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This paper is a continuation of research on concrete made using aggregates derived from sanitary ceramic wastes. Previous studies have shown that it is high strength concrete resistant to high temperatures. Looking for the optimal use of such concrete tests and analysis of its thermal accumulation were executed. The behavior during cooling of this concrete in comparison to other building materials was observed. The calculations of its thermal accumulation were made. It was found that concrete made on the basis of aggregate from waste sanitary ceramics can be recommended as a heat accumulating material.
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Sokolov, A. V., G. I. Deynega, N. A. Kuzmina, and I. G. Kuzmina. "STRUCTURAL AND MECHANICAL PROPERTIES OF A COMPOSITE MATERIAL BASED ON PARTIALLY STABILIZED ZIRCONIUM DIOXIDE DOPED WITH MAGNESIUM ALUMINATE SPINEL." Aviation Materials and Technologies, no. 3 (2021): 78–85. http://dx.doi.org/10.18577/2713-0193-2021-0-3-78-85.
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Ceramic materials based on zirconia (ZrO2) are high-tech raw materials for structural products used in various fields of technology. ZrO2 has a wide range of application due to its unique strength characteristics, chemical resistance and fire resistance. However, the disadvantage of zirconium ceramics is low resistance to thermal shock, which limits its use in products functioning in conditions of frequent temperature changes. In this paper, we consider the possibility of increasing the resistance to thermal shock of ceramics based on zirconium dioxide, due to the introduction of an aluminum-magnesium spinel additive (MgAl2O4).
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Cocic, Mira, Mihovil Logar, Suzana Eric, Visa Tasic, Snezana Devic, Sasa Cocic, and Branko Matovic. "Application of the final flotation waste for obtaining the glass-ceramic materials." Science of Sintering 49, no. 4 (2017): 431–43. http://dx.doi.org/10.2298/sos1704431c.
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This work describes the investigation of the final flotation waste (FFW), originating from the RTB Bor Company (Serbia), as the main component for the production of glass-ceramic materials. The glass-ceramics was synthesized by the sintering of FFW, mixtures of FFW with basalt (10%, 20%, and 40%), and mixtures of FFW with tuff (20% and 40%). The sintering was conducted at the different temperatures and with the different time duration in order to find the optimal composition and conditions for crystallization. The increase of temperature, from 1100 to 1480?C, and sintering time, from 4 to 6h resulted in a higher content of hematite crystal in the obtained glass-ceramic (up to 44%). The glass-ceramics sintered from pure FFW (1080?C/36h) has good mechanical properties, such as high propagation speed (4500 m/s) and hardness (10800 MPa), as well as very good thermal stability. The glass-ceramics obtained from mixtures shows weaker mechanical properties compared to that obtained from pure FFW. The mixtures of FFW with tuff have a significantly lower bulk density compared to other obtained glass-ceramics. Our results indicate that FFW can be applied as a basis for obtaining the construction materials.
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Andreola, Fernanda, Isabella Lancellotti, Paolo Pozzi, and Luisa Barbieri. "Eco-Compatible Construction Materials Containing Ceramic Sludge and Packaging Glass Cullet." Applied Sciences 11, no. 8 (April 15, 2021): 3545. http://dx.doi.org/10.3390/app11083545.
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This research reports results of eco-compatible building material obtained without natural raw materials. A mixture of sludge from a ceramic wastewater treatment plant and glass cullet from the urban collection was used to obtain high sintered products suitable to be used as covering floor/wall tiles in buildings. The fired samples were tested by water absorption, linear shrinkage, apparent density, and mechanical and chemical properties. Satisfactory results were achieved from densification properties and SEM/XRD analyses showed a compact polycrystalline microstructure with albite and wollastonite embedded in the glassy phase, similar to other commercial glass-ceramics. Besides, the products were obtained with a reduction of 200 °C with respect to the firing temperatures of commercial ones. Additionally, the realized materials were undergone to leaching test following Italian regulation to evaluate the mobility of hazardous ions present into the sludge. The data obtained verified that after thermal treatment the heavy metals were immobilized into the ceramic matrix without further environmental impact for the product use. The results of the research confirm that this valorization of matter using only residues produces glass ceramics high sintered suitable to be used as tile with technological properties similar or higher than commercial ones.
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Sankauskaitė, Audronė, Vitalija Rubežienė, Diana Kubilienė, Aušra Abraitienė, Julija Baltušnikaitė-Guzaitienė, and Kristina Dubinskaitė. "Investigation of Thermal Behavior of 3D PET Knits with Different Bioceramic Additives." Polymers 12, no. 6 (June 9, 2020): 1319. http://dx.doi.org/10.3390/polym12061319.
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The purpose of this study is to investigate the thermoregulatory properties of polyethylene terephthalate (PET) 3D knitted materials with bioceramic additives which are highly absorbing far-infrared (FIR) radiation. Ceramic materials are well-known and useful for thermal insulation applications. In order to compare different types of ceramic additives and coating methods for their incorporation into textile, several types of ceramic compounds with heat-retaining function were selected: germanium (Ge), aluminum (Al) and silicon (Si) additives were applied by impregnation in squeezing padder and titanium (Ti) by the screen printing method. The thermoregulatory properties (thermal resistance, heat-retaining effectiveness and air permeability) of 3D PET knits with bioceramic additives were estimated. In this study scanning electron microscopy (SEM) images were used to analyze the morphology of coated fabrics, X-ray fluorescence spectroscopy (XRF) analysis was applied to evaluate the number of minerals with high heat capacity in each formulation used for treatment. The knits coated with a formulation containing Ti ceramic additives demonstrated the most effective thermal behavior. Furthermore, better heat accumulation effectiveness of Ti ceramics containing knits was confirmed by Fourier transform infrared spectroscopy (FTIR) analysis. It was also determined that 3D knitted fabric with Ti ceramic additives showed the highest emissivity among tested samples and the implication is that this sample radiates its energy more efficiently than others.
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Spyrka, M., R. Atraszkiewicz, and L. Klimek. "A new ceramic composite based on spherical aluminium oxide for auxiliary panels in high-temperature firing processes." Archives of Materials Science and Engineering 1, no. 101 (January 1, 2020): 5–14. http://dx.doi.org/10.5604/01.3001.0013.9501.
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based on a spherical form of aluminium oxide. It is intended to limit the occurrence of technological problems related to the appropriate selection of auxiliary refractory materials, such as cracking, high heat capacity and variable coefficient of thermal expansion. Design/methodology/approach: A composite ceramic material with the spherical form of aluminium oxide included allows to reduce mass and stabilize characteristics of dimensional changes as a function of temperature in auxiliary panels in high-temperature firing processes with typical manufacturing process of the ceramics, which is gravity casting, drying and high-temperature firing. Findings: The study showed that the quantitative share of the spherical form of Al2O3 in the volume of ceramic material has a major impact on its properties. An increased share of spheres translates into greater material porosity and lower matrix density but also, by reducing the cross-section, into decreased strength properties. In the case of the developed ceramic material, there is no visible trend of a decrease in the coefficient of thermal expansion with increasing temperature, which is the case with traditional ceramic materials. Research limitations/implications: The strength of presented composite isn’t good and constitutes a further direction of research and development of the material. Practical implications: Although decreased strength properties, the composite with no visible trend of a decrease in the coefficient of thermal expansion with increasing temperature could be used as panels in high-temperature firing processes. Originality/value: New ceramic foundry composite based on a spherical form of aluminium oxide for auxiliary panels in high temperature processes.
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Khater, Gamal, and Maher Idris. "Preparation and properties of Li2O-BaO-Al2O3-SiO2 glass-ceramic materials." Processing and Application of Ceramics 8, no. 4 (2014): 203–10. http://dx.doi.org/10.2298/pac1404203k.
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The crystallization of some glasses, based on celsian-spodumene glass-ceramics, was investigated by different techniques including differential thermal analysis, optical microscope, X-ray diffraction, indentation, microhardness, bending strengths, water absorption and density measurement. The batches were melted and then cast into glasses, which were subjected to heat treatment to induce controlled crystallization. The resulting crystalline materials were mainly composed of ?-eucryptite solid solution, ?-spodumene solid solution, hexacelsian and monoclinic celsian, exhibiting fine grains and uniform texture. It has been found that an increasing content of celsian phase in the glasses results in increased bulk crystallization. The obtained glass-ceramic materials are characterized by high values of hardness ranging between 953 and 1013 kg/mm2, zero water absorption and bending strengths values ranging between 88 and 126MPa, which makes them suitable for many applications under aggressive mechanical conditions.
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Lynn, Ciarán J., Ravindra K. Dhir, and Gurmel S. Ghataora. "Sewage sludge ash characteristics and potential for use in bricks, tiles and glass ceramics." Water Science and Technology 74, no. 1 (March 24, 2016): 17–29. http://dx.doi.org/10.2166/wst.2016.040.
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The characteristics of sewage sludge ash (SSA) and its use in ceramic applications pertaining to bricks, tiles and glass ceramics have been assessed using the globally published literature in the English medium. It is shown that SSA possesses similar chemical characteristics to established ceramic materials and under heat treatment achieves the targeted densification, strength increases and absorption reductions. In brick and tile applications, technical requirements relating to strength, absorption and durability are achievable, with merely manageable performance reductions with SSA as a partial clay replacement. Fluxing properties of SSA facilitate lower firing temperatures during ceramics production, although reductions in mix plasticity leads to higher forming water requirements. SSA glass ceramics attained strengths in excess of natural materials such as granite and marble and displayed strong durability properties. The thermal treatment and nature of ceramic products also effectively restricted heavy metal leaching to low levels. Case studies, predominantly in bricks applications, reinforce confidence in the material with suitable technical performances achieved in practical conditions.
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Kang, Byeongguk, and Seunggu Kang. "Crystallization Behavior and Optical Properties of Glass-Ceramics Containing Nano-Diopside Crystals." Science of Advanced Materials 12, no. 4 (April 1, 2020): 510–15. http://dx.doi.org/10.1166/sam.2020.3657.
Full textAbstract:
Diopside is a ceramic material with excellent properties including a low dielectric constant, high thermal conductivity, low sintering temperature below 1000 °C, and high mechanical strength. It has been applied to wireless and optical communications, substrates for touch panels, lenses for UV-LED, building materials, and so on. In this study, glass-ceramics containing nano-sized diopside crystals were fabricated, and their transmittance at visible light and photoluminescence were evaluated. In particular, TiO2 was added as a nucleating agent to suppress the surface crystallization phenomenon and Mn was used as a dopant to emit red light. The glass-ceramics were prepared by heat treatment at a temperature lower than the maximum crystal growth temperature (TP) calculated from the non-isothermal analysis method using differential thermal analysis (DTA) for the formation of nano-sized crystals. For glass containing 20 wt% of TiO2, the Avrami constant was calculated to be 2.23 and the activation energy required for crystal growth to be 549 kJ/mol, reflecting typical bulk crystallization behavior. Glass-ceramics with high light transmittance up to 70% were obtained by inducing the bulk crystallization behavior, and the diopside crystal size was less than 10 nm, which was equal to or higher than that of commercialized transparent glass-ceramic products. Glass-ceramic specimens doped with Mn showed luminescence of 736∼766 nm wavelength at excitation light of 365 nm wavelength. The emission peak intensity increased with the amount of dopant added, but gradually decreased with increasing crystallinity of the diopside phase.