Journal articles: 'Ceramic materials - Thermal conductivity'

1

Wu, Jun Yan, Fei Chen, Ming Zhong Li, Qiang Shen, and Lian Meng Zhang. "Thermal Conductivity Design and Evaluation of Zirconium Phosphate Bonded Silicon Nitride Porous Ceramics." Key Engineering Materials 508 (March 2012): 21–26. http://dx.doi.org/10.4028/www.scientific.net/kem.508.21.

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In this Paper, Five Fundamental Effective Thermal Conductivity Structural Models (Series, Parallel, Two Forms of Maxwell-Eucken and Effective Medium Theory) Were Used to Analyze and Design Silicon Nitride Porous Ceramics. Then α-Si3N4Matrix Porous Ceramics Were Prepared with ZrP2O7as a Binder and Thermal Conductivity of ZrP2O7Bonded Si3N4Porous Ceramic Was Evaluated. ZrP2O7Bonded Si3N4Porous Ceramic Had Open and Interconnected Pore Structure which is either in EMT or in Maxwell-Euken 2. The Thermal Conductivity of ZrP2O7Bonded Si3N4Porous Ceramics Changes from 2.0 to 0.5 W/m•K with Increasing the Porosity from 20% to 51%. The Obtained Results Showed that the External Porosity Material with Maxwell-Euken 2 Structure Had the Lowest Thermal Conductivity in All Porous Materials. The Open and Interconnected Pore Structure of ZrP2O7Bonded Si3N4Porous Ceramics Provided much Lower Thermal Conductivity.

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Zhang, Hong Song, Su Ran Liao, Yuan Wei, and Shao Kang Guan. "Methods to Reduce Thermal Conductivity Further of Plasma Sprayed Thermal Barrier Coatings." Advanced Materials Research 230-232 (May 2011): 49–53. http://dx.doi.org/10.4028/www.scientific.net/amr.230-232.49.

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This paper reviews the theory of thermal conduction of ceramic materials with the aim to reduce further the thermal conductivity of plasma sprayed thermal barrier coatings. Methods of reducing thermal conductivity of plasma sprayed thermal barrier coatings including seeking for alternative ceramic materials to 8YSZ, addition of some dopants, preparing nanostructured coating and double-ceramic-layer coating are advised. It is indicated that the combination of colouring plus nanostructured and double-ceramic-layer coating of new ceramic candidate materials of lower thermal conductivity should be an very important research direction in future.

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Shinozaki, Kazuo, Kazuo Anzai, Nobuo Iwase, and Akihiko Tsuge. "Ceramic substrate materials with high thermal conductivity." Bulletin of the Japan Institute of Metals 25, no. 4 (1986): 253–59. http://dx.doi.org/10.2320/materia1962.25.253.

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Landon, Martine, and François Thevenot. "Thermal conductivity of SiC-AlN ceramic materials." Journal of the European Ceramic Society 8, no. 5 (January 1991): 271–77. http://dx.doi.org/10.1016/0955-2219(91)90120-o.

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Partridge, Graham. "Inorganic materials V. Ceramic materials possessing high thermal conductivity." Advanced Materials 4, no. 1 (January 1992): 51–54. http://dx.doi.org/10.1002/adma.19920040112.

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Xu, Qiang, Wei Pan, Chun Lei Wan, Long Hao Qi, He Zhuo Miao, and Fu Chi Wang. "A Promising LaSmZr₂O₇ Ceramic with Pyrochlore Structure for Thermal Barrier Coatings." Key Engineering Materials 368-372 (February 2008): 1328–30. http://dx.doi.org/10.4028/www.scientific.net/kem.368-372.1328.

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Based on La2Zr2O7 ceramic for thermal barrier coatings, LaSmZr2O7 ceramic doped with samarium ion was successfully prepared using solid state reaction method. The pellets were sintered at 1600°C for 10 hours in air. The phase structure, thermal conductivity and thermal expansion coefficient of LaSmZr2O7 ceramic and La2Zr2O7 ceramic were measured by XRD, laser-flash device, high-temperature dilatometry, respectively. The results show that the crystal structure of LaSmZr2O7 ceramic is not affected by the doped samarium ion in the zirconium lattice. The thermophysical results show that the thermal conductivity of the LaSmZr2O7 ceramic is lower than that of La2Zr2O7 ceramic, while the thermal expansion coefficient is higher than that of La2Zr2O7 ceramic. These results indicate that LaSmZr2O7 ceramic or Ln2Zr2O7 ceramics doped with other rare earth ions could be candidate materials for future thermal barrier coatings.

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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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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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10

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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Choi, Young Min, Jong Ung Kim, Beyong Hwan Ryu, Hyun Ju Chang, Chung Heop Kwak, and In Ho Kim. "Ceramic Electrode Materials for Electrostatic Chuck Applications." Solid State Phenomena 124-126 (June 2007): 791–94. http://dx.doi.org/10.4028/www.scientific.net/ssp.124-126.791.

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In general, Electrostatic chuck (ESC) was used to fix and clamp the silicon wafer with electrostatic force in the semiconductor fabrication process. Recently, due to their excellent chemical and plasma stability and high thermal conductivity, sintered ceramics has been used as an insulator material in the configuration of ESC. However, metals of high melting point, such as Mo, W, still used for electrode materials. Because of the thermal mismatch between metal electrode and ceramic insulator, micro cracks were produced at the interface during sintering process of ceramic or its operation process with high temperature, which leads to reduce the life time of ESC. To improve the compatibility between metal and ceramic, mesh type metal electrode was used in ESC but this type of electrode results in inhomogeneous electrostatic force. Homogeneous clamping force is very important to determine the final quality of semiconductor. We have investigated a ceramic electrostatic chuck composed of conducting ceramic electrode of titanium nitride instead of metal electrode. Aluminum nitride was added to titanium nitride to control the thermal expansion coefficient. This composite electrode shows not only a good electrical conductivity but also an excellent compatibility to dielectric layer. Compatibility between the electrode and dielectric layer enable to design the electrode with continuous sheet type which leads to homogeneous electrostatic force. Electrostatic force of ceramic ESC with conducting ceramic electrode was about 1700gf/4inch wafer when the applied voltage was DC 3kV.

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12

Luo, Xiqian, Bohan Guo, Xiaoqiang Wang, and Zeyu Zhang. "Development Trend of Low Thermal Conductivity Ceramic Materials." IOP Conference Series: Materials Science and Engineering 735 (January 17, 2020): 012019. http://dx.doi.org/10.1088/1757-899x/735/1/012019.

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13

Sanjeev, Megha, Mark R. Gilbert, and Samuel T. Murphy. "Anisotropic thermal conductivity in Li2TiO3 ceramic breeder materials." Fusion Engineering and Design 170 (September 2021): 112710. http://dx.doi.org/10.1016/j.fusengdes.2021.112710.

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14

Pan, Wei, Qiang Xu, Long Hao Qi, Jing Dong Wang, He Zhuo Miao, Kazutaka Mori, and Taiji Torigoe. "Novel Low Thermal Conductivity Ceramic Materials for Thermal Barrier Coatings." Key Engineering Materials 280-283 (February 2007): 1497–500. http://dx.doi.org/10.4028/www.scientific.net/kem.280-283.1497.

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The increase of the efficiency for gas turbines leads to the increasing combustion-chambertemperatures. Rapid degradation of the conventional yttria-stabilized zirconia coatings does not fulfill therequirements at these temperatures for a reliable thermal barrier coatings (TBCs) due to the phasetransformation of zirconia and the sintering behaviour. Therefore, it is very important to develop novelceramic materials for TBCs with low thermal conductivity and long-term stability at high temperatures.In this paper, the developments of potential novel ceramic materials for TBCs with low thermalconductivity are reviewed.

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15

Gu, Xing Yong, Shao Ling Wu, Ai Hua Zhang, Ting Luo, and Yun Xia Chen. "Effect of Different Composite Additives on Thermal Conductivity of Corundum Ceramics." Key Engineering Materials 512-515 (June 2012): 500–504. http://dx.doi.org/10.4028/www.scientific.net/kem.512-515.500.

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To improve the thermal conductivity of alumina ceramics, different inorganic materials such as AlN, BN, Si3N4 and SiC which own high thermal conductivity were integrated with 96% alumina ceramic. The effect of addition of AlN, BN, Si3N4 and SiC on water absorption, flexural strength and thermal conductivity of the as-prepared alumina-based composite ceramics were investigated. Field emission scanning electron microscopy (FESEM) and X-ray diffractometer (XRD) were employed to characterize the microstructure and phase compositions of the composites. The results showed that sintering temperature of 96% alumina ceramic matrixes were improved in varying degree due to adding AlN, BN, SiC and Si3N4. A small quantity of Al6Si2O13 crystals were formed in the case of adding Si3N4 and SiC, which is due to the oxidation of Si3N4 and SiC into SiO2 in the air and the subsequent reaction with alumina. At appropriate firing temperature, the flexural strength of the composites with the addition of AlN is the best and higher than corundum matrixes. Meanwhile, the thermal conductivity of the composites with AlN has 110% improvement. It is obvious that AlN with high thermal conductivity is suitable for improving the thermal conductivity of corundum ceramics.

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Chen, Ming, Xiao Meng Ji, and Yue Ma. "About Research of Ramic Concrete Strength and Thermal Performance." Advanced Materials Research 881-883 (January 2014): 1189–94. http://dx.doi.org/10.4028/www.scientific.net/amr.881-883.1189.

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The sludge, dredging silt and other materials prepared by mixing the ceramic, studying the effects of different sludge ratio, sintering temperature, the amount of excess sludge moisture content on ceramic, pile density, ignition loss rate. Produced ceramic concrete specimens tested by experiment and standard ceramic concrete specimens concrete specimen strength and thermal conductivity. Test specimen obtained ceramic concrete compressive strength of 13.57MPa, mixing concrete block compressive strength of 13.96MPa; gravel concrete specimens of thermal conductivity 0.394, ceramic concrete specimens thermal conductivity of 0.387. The results show that adding the ceramic concrete, ceramic concrete strength of certain decline, but the performance is enhanced thermal insulation, thermal insulation properties can greatly enhance it.

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Akishin, G. P., S. K. Turnaev, V. Ya Vaispapir, M. A. Gorbunova, Yu N. Makurin, V. S. Kiiko, and A. L. Ivanovskii. "Thermal conductivity of beryllium oxide ceramic." Refractories and Industrial Ceramics 50, no. 6 (November 2009): 465–68. http://dx.doi.org/10.1007/s11148-010-9239-z.

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Ichard, J. C., R. Pailler, and Jacques Lamon. "Ceramic Matrix Composite with Increased Thermal Conductivity." Advances in Science and Technology 45 (October 2006): 1405–10. http://dx.doi.org/10.4028/www.scientific.net/ast.45.1405.

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The purpose of the study was to increase the thermal conductivity of multilayered and self-sealing ceramic matrix composites via the silicon melt infiltration process. The first step of the process consisted in filling porosity using various organic xerogels by the sol-gel route. Carbon xerogels obtained by subsequent pyrolysis may reduce and homogenize the porous network within the composite. Cracking of the xerogels due to volumic shrinkage occurring during air drying may be decreased by controlling the initial parameters as concerns the gel solution and/or by operating a second impregnation/pyrolysis step. Filling of such composites by liquid silicon revealed that a specific route and particular conditions are necessary to eliminate porosity by controlling gas production species from pore surface at high temperature. This may be achieved through a directional flow and using highly viscous silicon (thanks to a localized wick), and by keeping the sides of the materials permeable to gas. This led to composite materials with a thermal conductivity which was four times as high as that of those materials densified via CVI. An increase in mechanical properties was also observed.

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Ignaszak, Zenon. "Substitute thermal conductivity coefficient for multi-component ceramic materials." Journal of Materials Processing Technology 143-144 (December 2003): 748–51. http://dx.doi.org/10.1016/s0924-0136(03)00324-8.

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Popov, P. A., K. V. Dukel’skiĭ, I. A. Mironov, A. N. Smirnov, P. L. Smolyanskiĭ, P. P. Fedorov, V. V. Osiko, and T. T. Basiev. "Thermal conductivity of CaF2 optical ceramic." Doklady Physics 52, no. 1 (January 2007): 7–9. http://dx.doi.org/10.1134/s1028335807010028.

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Gumen, V., A. ul Haq, B. Illyas, and A. Maqsood. "High-Temperature Thermal Conductivity of Ceramic Fibers." Journal of Materials Engineering and Performance 10, no. 4 (August 1, 2001): 475–78. http://dx.doi.org/10.1361/105994901770344917.

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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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Ji, Ru, Xi Dong Wang, Zuo Tai Zhang, and Li Li Liu. "Performance Test and Research of Ceramic Fiberboard." Applied Mechanics and Materials 488-489 (January 2014): 36–39. http://dx.doi.org/10.4028/www.scientific.net/amm.488-489.36.

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Ceramic fiber has great refractory and insulating ability. The coefficient of thermal conductivity is a significant characteristic of the fiber insulation materials, and shows the material thermal capacity. This paper not only research basic properties of ceramic fiberboard, but also focus on the influence factors of the effective thermal conductivity which include bulk density, temperature and moisture content.

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Li, Qi Song, Yu Jun Zhang, Hai Bin Sun, Yan Xia Zhai, and Chao He. "Effect of Carbon Black Content and Molding Pressure on the Thermal Conductivity of SiC/Si Ceramic Composites." Key Engineering Materials 655 (July 2015): 58–61. http://dx.doi.org/10.4028/www.scientific.net/kem.655.58.

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SiC/Si ceramic composites have been considered as promising candidate materials for heat exchanger due to their good thermal conductivity and corrosion resistance. In this work, the SiC/Si ceramic composites were fabricated by liquid silicon infiltration technique, and the effect of carbon black content and molding pressure on thermal conductivity of the composites was studied. With carbon black content increasing from 5 wt. % to 25 wt. %, the thermal conductivity increased from 42.36 W/(m·K) to 65.60 W/(m·K) when molding pressure was fixed as 50 MPa. With molding pressure increasing from 30 MPa to 110 MPa, the thermal conductivity of SiC/Si ceramic composites with 20 wt. % carbon black content increased firstly, and then decreased, obtaining a maximum thermal conductivity of 71.62 W/(m·K) under 90 MPa. The SiC/Si ceramic composites with an optimal thermal conductivity of 76.55 W/(m·K) at room temperature were obtained when carbon black content and molding pressure were 25 wt. %, 90 MPa, respectively.

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Piat, Romana, and Yuriy Sinchuk. "Thermal Conductivity Design for Locally Orthotropic Materials." Key Engineering Materials 577-578 (September 2013): 437–40. http://dx.doi.org/10.4028/www.scientific.net/kem.577-578.437.

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In this paper the development of a computational model for the thermal conductivity design for locally orthotropic materials is presented. The material orientation of a two-dimensional locally orthotropic solid subjected to thermal loads is designed for minimization of the local temperature. Two optimization problems are considered: the minimization of the highest (hot-spot) temperature and the minimization of the temperature according to the weights distribution. For both problems rules for calculation of the optimal material orientation are derived analytically. The analysis is based on the idea of the principal stresses method for optimization of material orientation in linear elasticity problems. The results of the analysis are implemented and the developed computational model is tested on an example of the lamella orientation optimization in a metal-ceramic composite.

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Novais, Rui M., Maria P. Seabra, and João A. Labrincha. "Lightweight Bi-Layered Ceramic Tiles for Novel Applications." Advances in Science and Technology 91 (October 2014): 82–87. http://dx.doi.org/10.4028/www.scientific.net/ast.91.82.

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The excellent properties of porcelain stoneware tiles make them ideal materials for floor covering. However, their high density limits their use in novel applications, where low weight and low thermal conductivity are required. In this work, the production of lightweight bi-layered ceramics, with suitable mechanical resistance and low thermal conductivity in comparison with commercial tiles, is reported. The weight and thermal conductivity reduction was achieved by means of porogen incorporation. The possibility of using polypropylene (PP) as a pore forming agent was evaluated. PP completely burns out at relatively low temperatures with no emission of hazardous gases, and does not induce defects in the ceramic pieces. Results demonstrate that porosity (pore volume, number and area) can be easily controlled by adjusting the porogen amount (5-15 wt.%). The reduction in weight (7.5%) and thermal conductivity (up to five times) in comparison to commercial stoneware tiles might extend their use to novel applications.

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Zych, Jerzy, Janusz Wróbel, Jan Mocek, and Marcin Myszka. "Thermal Conductivity of Selected Ceramic Materials at a Transient Heat Flow." Journal of Applied Materials Engineering 60, no. 1 (June 5, 2020): 3–11. http://dx.doi.org/10.35995/jame60010001.

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In this paper, we present comparative investigations. We examined two kinds of ceramic materials used to produce bricks for isothermal cleading of the riser heads of middle and large steel castings. The ceramic materials were characterised by a low specific density (No. 1 − ρ = 0.854 g/cm3; No. 2 − ρ = 0.712 g/cm3). Thermal conductivity tests at a transient heat flow were performed by analysing the heating process of samples taken from the tested ceramic bricks, placed in a special mould in which metal was poured, and by recording the cooling process of the casting. The method proposed in this paper for the determination of samples’ thermo-physical properties is based on measuring the temperature field of the casting–sample system by means of thermocouples situated in various measuring points; it allows the direct investigation of cooling and solidification processes of metals in sand moulds. The heating process of the ceramic samples was analysed by measuring the temperature in five points situated at various distances from the heating surface (casting–sample surface). A large difference in the heating rates of samples of different materials was revealed in our comparative investigations, which indirectly indicated the materials’ heat abstraction ability from the casting surface. The ceramic material characterised by a lower density much slowly conducted heat and, therefore, appeared to be a better material for insulation cleading. At the depth of 40.0 mm, we measured differences in the heating degree corresponding to more than 190 °C. The aim of this comparative study was the evaluation of the suitability of porous insulating materials as cleading of riser heads used in the production of large steel castings.

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Maruyama, H. "Special Issue on Insulation Materials. Thermal Conductivity of Ceramic Fibers." Netsu Bussei 6, no. 1 (1992): 32–36. http://dx.doi.org/10.2963/jjtp.6.32.

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Headley, Alexander J., Michael B. Hileman, Aron S. Robbins, Edward S. Piekos, Emily K. Stirrup, and Christine C. Roberts. "Thermal conductivity measurements and modeling of ceramic fiber insulation materials." International Journal of Heat and Mass Transfer 129 (February 2019): 1287–94. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2018.10.060.

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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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García, E., A. de Pablos, M. A. Bengoechea, L. Guaita, M. I. Osendi, and P. Miranzo. "Thermal conductivity studies on ceramic floor tiles." Ceramics International 37, no. 1 (January 2011): 369–75. http://dx.doi.org/10.1016/j.ceramint.2010.09.023.

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Zhang, Feng, Qun Bo Fan, Fu Chi Wang, and Hui Ling Zhang. "Perturbation Molecular Dynamics Simulation of Thermal Conductivity of Zirconia." Key Engineering Materials 368-372 (February 2008): 1325–27. http://dx.doi.org/10.4028/www.scientific.net/kem.368-372.1325.

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Thermal conductivity of zirconia and yttrium stabilized zirconia (YSZ) is calculated with perturbation molecular dynamics method (PMD). The results showed that thermal conductivity of YSZ is lower than that of pure zirconia and PMD is a very effective way in thermal conductivity calculation for ceramics. In higher temperature region, the calculated values show a different tendency with the experiment ones, which is because that photon conduction is not considered in PMD method. By taking photon effects into account, the calculated thermal conductivity curve is found fairly well coherent with measurements. In addition, the thermal expansion of zirconia is also presented by calculating the volumes at different temperatures. The results and methods in this paper have been proved to be very helpful in further design of new ceramic materials in the field of thermal barrier coatings (TBCs).

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Oh, Bok-Hyun, Choong-Hwan Jung, Heon Kong, and Sang-Jin Lee. "Thermal Characteristics of Cu Matrix-SiC Filler Composite Using Nano-Sized Cu Powder." Journal of Nanoscience and Nanotechnology 21, no. 9 (September 1, 2021): 4964–67. http://dx.doi.org/10.1166/jnn.2021.19262.

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A Cu metal-ceramic filter composite with high thermal conductivity and a suitable thermal expansion coefficient was designed to be applied to high performance heat dissipation materials. The purpose of using the ceramic filler was to decrease the high coefficient of thermal expansion of Cu matrix utilizing the high thermal conductivity of Cu. In this study, a SiC ceramic filler powder was added to the Cu sol including Zn as a liquid phase sintering agent. The final complex was produced by applying a PVB polymer to prepare a homogeneous precursor followed by sintering in a reducing atmosphere. The pressureless sintered composite showed lower thermal conductivity than pure bulk Cu due to the some residual pores. In the case of the Cu–SiC composite in which 10 wt% of SiC filler was added, it showed a thermal conductivity of 100 W/m·°C and a thermal expansion coefficient of 13.3×10−6/°C. The thermal conductivity showed some difference from the theoretical calculated value due to the pores in the composite, but the thermal expansion coefficient did not show a significant difference.

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Hongsong, Zhang, Liao Suran, and Guan Shaokang. "Preparation and Thermal Conductivity of Dy2Ce2O7 Ceramic Material." Journal of Materials Engineering and Performance 21, no. 6 (April 29, 2011): 1046–50. http://dx.doi.org/10.1007/s11665-011-9950-z.

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Xie, Zhi Lling, Lin Zhu Sun, and Fang Yang. "Orthogonal Experimental Study on Thermal Insulation Mortar Containing Mixed Ceramic Sand and Vitrified Micro Bead Aggregates." Advanced Materials Research 450-451 (January 2012): 659–62. http://dx.doi.org/10.4028/www.scientific.net/amr.450-451.659.

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Mixed light aggregates can effectively reduce the coefficient of thermal conductivity of composite materials. Through orthogonal experiments of thermal insulation mortar containing mixed ceramic sand and vitrified micro bead aggregates, we analyzed the law of influence of relevant factors on the dry bulk density, coefficient of thermal conductivity and compressive strength of mortar containing mixed ceramic sand and vitrified micro bead aggregates and provided basic data for further improvement of such thermal insulation mortar so as to promote the development and application of high performance thermal insulation materials.

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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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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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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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Abbas, Muhammad Rabiu, Alias Mohd Noor, Srithar Rajoo, Norhayati Ahmad, Uday M. Basheer, and Muhammad Hanafi Md Sah. "Thermal Conductivity and Specific Heat Capacity of Different Compositions of Yttria Stabilized Zirconia-Nickel Mixtures." Advanced Materials Research 1119 (July 2015): 783–88. http://dx.doi.org/10.4028/www.scientific.net/amr.1119.783.

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Ceramic-metal composites also known as functionally gradient materials (FGM) are composite materials which are fabricated in order to have a gradual variation of constituent materials’ thermal and mechanical properties so as to have a smooth variation of the material properties in order to improve the overall performance and reduce the thermal expansion mismatch between ceramic and metal. The objective of the study is to determine the thermal properties of various percentage composition of Yttria stabilized zirconia-Nickel mixtures for application as thermal barrier coating materials in automotive turbocharger turbine volute casing. Specific heat capacity of different percentage composition of ceramic-metal powder composite were determined using DSC822 differential scanning calorimeter (Mettle Tolodo, Switzerland) at temperature ranges between 303K to 873K. While the thermal conductivity of the different percentage composition of ceramic-metal composite structures were determined using P5687 Cussons thermal conductivity apparatus (Manchester, UK) which uses one-dimensional steady-state heat conduction principle. The results have indicated that the specific heat capacity of the FGM increases sharply with an increase in temperature while the thermal conductivity of the FGM decreases with an increase in temperature. These results strongly agree with the theoretical and experimental values as well as the rule of mixtures obtainable in literature, which indicated the suitability of these FGM materials for thermal barrier coating applications.

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Vedyakov, Ivan, Vladimir Vaskalov, Nikolai Maliavski, and Mikhail Vedyakov. "Highly Efficient Glass Ceramic Thermal Insulation." E3S Web of Conferences 263 (2021): 01017. http://dx.doi.org/10.1051/e3sconf/202126301017.

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Alkali-silicate thermal insulation materials (foam silicates) belong to the group of mineral heat insulators. Their main disadvantage is insufficient water resistance, to increase which special water-strengthening additives are introduced into materials. The aim of this work was to obtain and study foam silicates in granular (FGCG) and slab (FGCS) forms using a new production technology characterized by a simple one-stage technological scheme. Natural or technogenic amorphous silica, glassy sodium silicate (with the addition of carbonate or hydroxide) and a carbon-containing foaming agent, were used as the raw materials. Some part of the silica component was included in the binder solution, which made it possible to increase the silicate modulus in the final product to 5-10. This factor together with rather high Al2O3 concentration in the silica raw, made it possible to obtain foamed materials of very high water resistance. Another feature of the applied technology was a high foaming temperature (750–900°C). This factor makes a significant contribution to improving the water resistance of foam silicates, and significantly reducing their thermal conductivity and water absorption. As a result, FGCG was obtained with a bulk density of 170-440 kg/m3 (for FGCS – 300-400 kg/m3), a compressive strength in a cylinder of 0.5-6.3 MPa, a thermal conductivity of 0.046-0.084 W/(m·K) and a water absorption of 7.8-13.5% by volume. Mass loss of the specimens in boiling water was 0.12-0.33%, which puts obtained foamed materials on a par with most waterproof foam silicates being produced today.

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Wu, Qing Ren, Xiao Ping Wang, Hua Qing Xie, and Tonggeng Xi. "A Predicting Method for Thermal Conductivity of Functional Carbide Crystals and Ceramic Materials." Key Engineering Materials 280-283 (February 2007): 1175–78. http://dx.doi.org/10.4028/www.scientific.net/kem.280-283.1175.

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A new method for predicting the thermal conductivity of functional carbide crystals and ceramics materials is proposed. The effect of average relative atomic mass and density on thermal conductivities of carbide function crystals and ceramics is considered in the method. Correlations are developed for thermal conductivity with average relative atomic mass and density according to the microscope theories of heat conduction. The thermal conductivities calculated from the prediction equation for many functional carbide crystals and ceramics were compared with the measured dada and found to be agreement. It is show that, for the most of functional carbide crystals and ceramics materials, the relative error between the predicting values and the measuring data is ± 20%. It is discovered in further analysis that the larger the average relative atomic mass and density are, the more accurately the thermal conductivities predict.

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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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Zhang, Hong Song, Su Ran Liao, Wei Yuan, and Shao Kang Guan. "Preparation and Thermal Conductivity of Y₂Ce₂O₇ Ceramic Material." Advanced Materials Research 266 (June 2011): 59–62. http://dx.doi.org/10.4028/www.scientific.net/amr.266.59.

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Y2Ce2O7 ceramic material was prepared by solid reaction at 1600°C for 10h. The phase composition, microstructure and thermal conductivity of this material were investigated. XRD results reveals that single phase Y2Ce2O7 with fluorite structure was synthesized. Microstructure of Y2Ce2O7 was dense and no other unreacted oxides or interphase existed in the interfaces between grains. Because of phonon scattering by oxygen vacancies and difference in atomic mass between substitutional atoms and host atoms, thermal conductivty of Y2Ce2O7 is lower than that of 8YSZ, which implies that this ceramic can be used as novel candidate materials for thermal barrier coatings in the future.

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Lee, Ran-Rong. "Development of High Thermal Conductivity Aluminum Nitride Ceramic." Journal of the American Ceramic Society 74, no. 9 (September 1991): 2242–49. http://dx.doi.org/10.1111/j.1151-2916.1991.tb08291.x.

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Abraitis, R. J., A. K. Dargis, A. A. Rusyatskas, and É. J. Sakalauskas. "A study of thermal conductivity of structural ceramic materials. Part I. State of research of thermal conductivity of structural materials." Refractories and Industrial Ceramics 40, no. 7-8 (July 1999): 351–58. http://dx.doi.org/10.1007/bf02762586.

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Peterson, G. P., and L. S. Fletcher. "On the Thermal Conductivity of Dispersed Ceramics." Journal of Heat Transfer 111, no. 4 (November 1, 1989): 824–29. http://dx.doi.org/10.1115/1.3250792.

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Because of high operating temperatures, advanced high-performance gas turbines will require the use of new types of material. Included among these materials will be dispersed ceramic composites capable of withstanding high temperatures and providing the required strength and wear characteristics. Presented here is a review of several analytical methods by which the effective thermal conductivity of these materials can be determined. In addition, the description and results of an experimental investigation designed to measure the effective thermal conductivity of four of these materials, tungsten carbide–cobalt, tungsten–copper, silicon nitride, and titanium diboride, are presented. Measurements were made over a temperature range of 300 K to 900 K in order to determine the mean effective thermal conductivity and the temperature dependence of this conductivity. The results of the experimental investigation are compared to the values obtained from several of the analytical methods presented and also with other data available in the literature.

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Perovskaya, Kseniya, Daria Petrina, Evgeniy Pikalov, and Oleg Selivanov. "Polymer waste as a combustible additive for wall ceramics production." E3S Web of Conferences 91 (2019): 04007. http://dx.doi.org/10.1051/e3sconf/20199104007.

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The research presents the experimental results devoted to the charge composition development for the production of wall ceramic products, based on low plasticity clay using additives. One of the additives is polymer waste in the amount of 15 wt. %, in particular it is unplasticized polyvinyl chloride used as a combustible additive for increasing ceramics porosity thus decreasing its density and consequently the load on the basement when the walls are constructed. Besides it decreases thermal conductivity and improves energy efficiency of developed wall ceramics application. Boric acid is a second additive used as a fuse thus reducing the temperature of ceramics liquid-phase sintering and forming a vitreous phase, which increases the strength characteristics and reduces water absorption, and therefore increases the product frost resistance. However the vitreous phase amount is insignificant and the products still are characterized by porosity sufficient for density and thermal conductivity reduction up to the level of conditionally effective thermal performance. Thus the application of the developed wall ceramics facilitate the production of energy effective products, which can be used for multi-layers walls construction providing modern thermal engineering standards and rational consumption of building materials. Herewith the developed materials properties correspond to the requirements of solid ceramic bricks used in Russian climatic conditions and help to combine the functions of bearing, heat-insulating and partly facing layers to a certain extend thus expanding their application.

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Tsuruta, Akihiro, Katsuhiro Nomura, Masashi Mikami, Yoshiaki Kinemuchi, Ichiro Terasaki, Norimitsu Murayama, and Woosuck Shin. "Unusually Small Thermal Expansion of Ordered Perovskite Oxide CaCu3Ru4O12 with High Conductivity." Materials 11, no. 9 (September 7, 2018): 1650. http://dx.doi.org/10.3390/ma11091650.

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We measured the coefficient of thermal expansion (CTE) of conducting composite ceramics 30 vol.% CuO-mixed CaCu3Ru4O12 together with CaCu3Ru4O12 and CuO. Although conducting ceramics tend to show higher CTE values than insulators, and its CTE value does not match with other ceramic materials, the CTE of CaCu3Ru4O12 (7–9 × 10−6/K) was as small as those of insulators such as CuO (9 × 10−6/K), alumina (8 × 10−6/K), and other insulating perovskite oxides. We propose that the thermal expansion of CaCu3Ru4O12 was suppressed by the Cu-O bond at the A-site due to the Jahn–Teller effect. This unusually small CTE of CaCu3Ru4O12 compared to other conducting oxides plays a vital role enabling successful coating of 30 vol.% CuO-mixed CaCu3Ru4O12 thick films on alumina substrates, as demonstrated in our previous study.

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Wang, Shuangxi, Haifeng Lan, Wenjun Wang, Gaoshan Liu, and Dan Zhang. "Al2O3-Cu Substrate with Co-Continuous Phases Made by Powder Sintering Process." Materials 11, no. 8 (August 20, 2018): 1477. http://dx.doi.org/10.3390/ma11081477.

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Ceramic-Al substrates with co-continuous ceramic and metal phases, which exhibit high thermal conductivity and compatible coefficient of thermal expansion (CTE), have been widely investigated through the process of die-casting. In this research, a kind of powder sintering process was proposed for fabricating ceramic-Cu composite substrates with co-continuous phases. Copper fiber (Cuf) has excellent thermal conductivity and large aspect ratio, making it an ideal material to form bridging network structures in the ceramic-Cu composite. To maintain the large aspect ratio of Cuf, and densify the composite substrate, ZnO-SiO2-CaO glass was introduced as a sintering additive. Both Al2O3/glass/Cuf and Al2O3/30glass/Cup composite substrates were hot-pressed at 850 °C under 25 MPa. Experimental results showed that the thermal conductivity of Al2O3/30glass/30Cuf composite substrate was as high as 38.9 W/mK, which was about 6 times that of Al2O3/30glass; in contrast, the thermal conductivity of Al2O3/30glass/30Cup composite substrate was only 25.9 W/mK. Microstructure observation showed that, influenced by hot press and corrosion of molten ZnO-SiO2-CaO glass, the copper fibers were deformed under hot-pressing, and some local melting-like phenomena occurred on the surface of copper fiber at 850 °C under 25 MPa. The molten phase originating from surface of Cuf welded the overlapping node of copper fibers during cooling process. Finally, the interconnecting metal bridging in ceramic matrix was formed and behaved as a rapid heat-dissipating channel, which is similar to substrates prepared through die-casting process by porous ceramic and melted Al.

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Yang, Liangliang, Allah Ditta, Bo Feng, Yue Zhang, and Zhipeng Xie. "Study of the Comparative Effect of Sintering Methods and Sintering Additives on the Microstructure and Performance of Si3N4 Ceramic." Materials 12, no. 13 (July 3, 2019): 2142. http://dx.doi.org/10.3390/ma12132142.

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The Si3N4 ceramics were prepared in this study by gas pressure sintering (GPS) and spark plasma sintering (SPS) techniques, using 5 wt.% Yb2O3–2 wt.% Al2O3 and 5 wt.% CeO2–2 wt.% Al2O3 as sintering additives. Based on the difference in sintering methods and sintering additive systems, the relative density, phase composition, phase transition rate, microstructure, mechanical properties, and thermal conductivity were comparatively investigated and analyzed. SPS proved to be more efficient than GPS, producing higher relative density, bending strength, hardness, and thermal conductivity of Si3N4 ceramic with both additive systems; however, the phase transition rate and fracture toughness were lower. Similarly, higher bending strength, hardness, and thermal conductivity were achieved with Yb2O3–Al2O3 than CeO2–Al2O3 in the case of GPS and SPS, and only the relative density, fracture toughness, and phase transition rate were lower.

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Journal articles on the topic 'Ceramic materials - Thermal conductivity'

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