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Letteratura scientifica selezionata sul tema "Refractory ceramic"

Autore: Grafiati

Pubblicato: 22 febbraio 2025

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Articoli di riviste sul tema "Refractory ceramic"

Du, Weiliang, e Shengli Jin. "Discrete Element Modelling of Cold Crushing Tests Considering Various Interface Property Distributions in Ordinary Refractory Ceramics". Materials 15, n. 21 (31 ottobre 2022): 7650. http://dx.doi.org/10.3390/ma15217650.

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The microstructures and local properties of ordinary refractory ceramic materials are heterogeneous and play a role in the fracture behavior of ordinary refractory ceramic materials. It is important to consider them in numerical modeling. Herein, the discrete element (DE) method was applied to determine the influences of heterogeneity of ordinary refractory ceramic materials by applying statistically distributed interface properties (uniform, Weibull), as opposed to constant interface properties, among the elements. Uniaxial cold crushing tests were performed as a case study. A reasonable loading strain rate for receiving quasi-static loading conditions and computation efficiency was evaluated. The loading wall displacement was recorded to present the stress–strain curves of cold crushing tests. Furthermore, the effects of the interface property distributions on the load/displacement curve, fracture energy, cold crushing strength, and fracture events were investigated. The results reveal that the DE method is a promising method for visualizing and quantifying the post–peak fracture process and crack events in ordinary refractory ceramics. Different interface property distributions contribute to significant variances in the load/displacement curve shape and fracture pattern. The heterogeneity of ordinary refractory ceramics can be further determined by comparing the experimental curves and fracture propagation along with an inverse identification approach.

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Ergashev, M. M. "EXPLORING CERAMIC REFRACTORY MATERIALS: CLASSIFICATION AND TECHNOLOGICAL INNOVATIONS". International Journal of Advance Scientific Research 4, n. 11 (1 novembre 2024): 17–26. http://dx.doi.org/10.37547/ijasr-04-11-04.

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The article explores the primary types of ceramic refractory materials, focusing on their properties and applications in high-temperature industrial processes. Key technological advancements in refractory manufacturing are discussed, with an emphasis on enhancing material strength, chemical resistance, and durability. The analysis highlights the specific characteristics of each refractory type, including fireclay, magnesite, corundum, and silicon carbide, and their utilization across various industries such as metallurgy, energy, and glass production. Modern production and modification methods for refractories are presented, aimed at improving thermal resistance and reducing the operational costs of equipment.

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Vakhula, Orest, Myron Pona, Ivan Solokha, Oksana Koziy e Maria Petruk. "Ceramic Protective Coatings for Cordierite-Mullite Refractory Materials". Chemistry & Chemical Technology 15, n. 2 (15 maggio 2021): 247–53. http://dx.doi.org/10.23939/chcht15.02.247.

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The issue of cordierite-mullite refractories protection from the influence of aggressive factors is considered. The interaction between the components of protective coatings has been studied. It has been investigated that in the systems based on poly(methylphenylsiloxane) filled with magnesium oxide, alumina and quartz sand, the synthesis of cordierite (2MgO•2Al2O3•5SiO2), mullite (3Al2O3•2SiO2) or magnesium aluminate spinel (MgO•Al2O3) is possible. The basic composition of the protective coating, which can be recommended for the protection of cordierite-mullite refractory, is proposed.

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Shevtsov, S. V., I. A. Kovalev e A. S. Chernyavskii. "High-temperature nitridization of zirconium, production of ceramic and metal-ceramic refractory structures". Transaction Kola Science Centre 12, n. 2-2021 (13 dicembre 2021): 279–81. http://dx.doi.org/10.37614/2307-5252.2021.2.5.055.

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Based on the results of the work performed, the nature of the phase distribution in the resulting material, structural and morphological differences between the layered metal-ceramic and ceramic structures were established. The temperature range of zirconium nitride synthesis from 1500 to 2400° C is investigated, and the possibility of successful synthesis of nitride ceramics by the indicated method at temperatures significantly exceeding the melting point of the metal is shown.

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Dudnik, E. V., A. V. Shevchenko, A. K. Ruban, Z. A. Zaitseva, V. M. Vereshchaka, V. P. Red’ko e A. A. Chekhovskii. "Refractory and ceramic materials". Powder Metallurgy and Metal Ceramics 46, n. 7-8 (luglio 2007): 345–56. http://dx.doi.org/10.1007/s11106-007-0055-z.

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Kusiorowski, Robert. "Effect of titanium oxide addition on magnesia refractories". Journal of the Australian Ceramic Society 56, n. 4 (20 luglio 2020): 1583–93. http://dx.doi.org/10.1007/s41779-020-00502-z.

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AbstractThis work contains the results of investigations into the influence of titanium oxide (TiO2) addition on the properties of refractory magnesia ceramics. The presented research involved adding titanium oxide in a classic way, i.e. directly to the ceramic mix. The conducted laboratory tests revealed a significant impact of this oxide on the properties of refractory materials. Addition of a small amount of TiO2 favoured the ceramic mix sintering whereas adding a bigger amount—more than 10 wt% resulted in the formation of refractories characterised by considerable porosity and low mechanical strength. Addition of this oxide also slightly improves the corrosive resistance of refractories.

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Jiao, Lei, e Bai Yang Jin. "Ceramic Fiber Application Research". Applied Mechanics and Materials 271-272 (dicembre 2012): 102–6. http://dx.doi.org/10.4028/www.scientific.net/amm.271-272.102.

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Ceramic fiber is a kind of fibrous lightweight refractory with many advantages of light weight, thermostability, good heat stability, low thermal conductivity, small specific heat, and resistance to mechanical vibration and so on. As a result of them, it has been used widely in lots of fields, such as machinery, metallurgy, chemical industry, oil, ceramics, glass and electron. From the aspect of the ceramic fiber development, in this essay, the types and preparation methods of ceramic fiber have been listed one by one, and the author focused on analyzing the development trend of ceramic fiber and the application in papermaking industry.

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Seli, Hazman, Japri Bujang e Zainal Arifin Ahmad. "Preliminary Identification of Silantek Clay as Potential Refractory". Materials Science Forum 840 (gennaio 2016): 124–30. http://dx.doi.org/10.4028/www.scientific.net/msf.840.124.

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Silantek clay deposits were characterized and evaluated for their potential as structutral ceramic products raw materials through chemical, mineralogical and refractory (1250 to 1600o C) properties determinations. Results show that the main oxides in the samples were SiO2 and Al2O3, whereas the other oxides present only in small quantity. Kaolinite(Al2Si2O5(OH)4) and quartz(SiO2) present as dominant mineral phases and the minor phases of mullite(Al6Si2O13) and zeolite(Na2Al2Si3O10·2H2O) also appeared in the samples. From the results of the refractoriness tests up to 1600°C, samples ST11, ST23A, ST31A, ST31B, ST33 have potential for refractory products as they demonstrated high thermal resistance properties(over 1600°C). Silantek clay potential to be used as raw materials mainly for refractory, structural ceramics and other common ceramic products

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Vakalova, T. V., N. P. Sergeev, D. T. Tolegenov, D. Zh Tolegenova e N. A. Mitina. "Red mud in high-strength ceramics production". Vestnik Tomskogo gosudarstvennogo arkhitekturno-stroitel'nogo universiteta. JOURNAL of Construction and Architecture 26, n. 2 (22 aprile 2024): 171–84. http://dx.doi.org/10.31675/1607-1859-2024-26-2-171-184.

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The work is devoted to the creation of high-strength ceramic materials with technogenic waste fillers.Purpose: Investigation of the ceramic and composite production based on chemical and metallurgical wastes to create new types of high quality constructional ceramics.Methodology/approach: The use of refractory clay with the addition of high-iron bauxite sludge as the main raw material. Bauxite sludge functions in compositions with aluminosilicate raw materials at burning at 1100 to 1200 °С, reduce to sintering due to its melting at 1150 °С.Research findings: Refractory clay compositions with red mud in the amount of 20 to 50 % at the burning temperature of 1050 °С, provide the ceramic formation possessing the compressive strength 1.3 to 1.5 times higher than that of clay samples without additives, i.e., 91 and 122–132 MPa, respectively.Value: The obtained ceramic compositions based on red mud determine a production of high-strength anorthite and anorthite-helenite ceramics using dry pressing.

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Varfolomeev, M. S., e G. I. Shcherbakova. "The refractory compositions designing for the highly-heat-resistant ceramic products in the foundry practice". NOVYE OGNEUPORY (NEW REFRACTORIES), n. 6 (26 luglio 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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Tesi sul tema "Refractory ceramic"

Lohner, Kevin Andrew 1974. "Microfabricated refractory ceramic structures for micro turbomachinery". Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/9479.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1999.
Includes bibliographical references (p. 103-109).
The MIT Microengine Project was initiated in 1995 as a joint effort between the Gas Turbine Laboratory (GTL) and Microsystems Technology Laboratory (MTL) to develop a MEMS-based micro-gas turbine engine. The thermodynamic requirements of power-generating turbomachinery drive the design towards high rotational speeds and high temperatures. To achieve the specified performance requires materials with high specific strength and creep resistance at elevated temperatures. The thermal and mechanical properties of silicon carbide make it an attractive candidate for such an application. Silicon carbide as well as silicon-silicon carbide hybrid structures are being designed and fabricated utilizing chemical vapor deposition of relatively thick silicon carbide layers (10-100 [mu]m) over time multiplexed deep etched silicon molds. The silicon can be selectively dissolved away to yield high aspect ratio silicon carbide structures with features that are hundreds of microns tall. Positive mold, negative mold, and hybrid Si/SiC processing techniques appear to be feasible microfabrication routes with potential for increasing microengine performance. Research has been performed to characterize the capabilities of these processes. Specimens fabricated in the course of this research show very good conformality and step coverage with a fine (~0.1 [mu]m diameter) columnar microstructure. Surface roughness (Rq) of the films is on the order of 100 nm, becoming rougher with thicker deposition. Residual stress limits the achievable thickness, as the strain energy contained within the compressive film increases its susceptibility to cracking. Room temperature biaxial mechanical testing of CVD silicon carbide exhibits a reference strength of 724 MPa with a Weibull modulus, m =16.0. This thesis documents the design trades that led to the selection of CVD SiC as the primary candidate refractory material for the microengine, and the initial experiments performed to assess its suitability and guide future material and process development.
by Kevin Andrew Lohner.
S.M.

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Martin, Rachel (Rachel M. ). "Mechanical testing of rapid-prototyping refractory ceramic print media". Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/86278.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Materials Science and Engineering, February 2013.
Page 30 blank. Cataloged from PDF version of thesis.
Includes bibliographical references.
Additively manufactured (3D-printed) refractory alumina-silica ceramics were mechanically tested to ascertain their ultimate tensile strengths and observed to determine their dimensional consistency over the printing and post-printing process. The equipment used to perform tensile testing was designed and built for use with custom-designed tensile test samples. Two ceramic powders, V18 (electronic-grade alumina, colloidal silica, and organic content) and 403C (200-mesh mullite, organic content, and magnesium oxide), were printed into test samples on ZCorporation ZPrinter® 310 and 510 machines, before being infiltrated with tetraethylorthosilicate (TEaS), and in some cases infiltrated again with a 40% by weight suspension of silica in water (Ludox). Ludox-infiltrated V18 proved to be the strongest medium, with a UTS of 4.539 ± 1.008 MPa; non-Ludox-infiltrated V18 had a UTS of 2.071 ± 0.443 MPA; Ludox-infiltrated 403C was weakest with a UTS of 1.378 ± 0.526 MPa. Within V18, greater silica content lead to greater tensile strength, but this did not hold true for 403C. 403C displayed volumetric shrinkage of about 1.5%, while V18's volumetric shrinkage ranged from 7% to 14%.
by Rachel Martin.
S.B.

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Esanu, Florin. "Self-flowing refractory castables, study of the hydraulic bond and ceramic matrix formation". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq61086.pdf.

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Carlsson, Mats. "Preparation and characterisation of refractory whiskers and selected alumina composites". Doctoral thesis, Stockholm : Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi, Univ, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-113.

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Rydén, Gabriel. "Ab initio lattice dynamics and Anharmonic effects in refractory Rock-salt structure TaN ceramic". Thesis, Linköpings universitet, Teoretisk Fysik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-174208.

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Transition Metal Nitrides (TMN) are of considerable importance for the industry and have gathered a great deal of interest in the scientific community, mostly due to their unique physical and mechanical properties. To increase the understanding of what enables them to have such extraordinary properties requires the study of lattice dynamics and their phonon dispersion. In this thesis, the transition metal nitride, TaN, is studied extensively along with preliminary results for NbN. The primary tool for this investigation is simulations. Computational methods, such as ab initio Molecular Dynamics (AIMD) and the Temperature Dependent Effective Potential (TDEP) method are used to generate phonon spectra and to compute the lattice thermal conductivity. The results indicate that TaN crystal structure stabilizes dynamically at much lower temperatures than previously established with other methods. The average linear thermal expansion coefficient of TaN is a = 9.0 * 10-6 K-1, which is consistent with other TMN. The phonon-phonon lattice thermal conductivity of TaN follows a similar behaviour as for other TMN. Preliminary result for NbN suggests a behaviour at lower temperatures that are similar to that observed for TaN. However, further investigations are required to pinpoint TaN and NbN transition temperatures more exactly and include effects, such as electron-phonon scattering and isotope effects for a better estimation of the lattice thermal conductivity.

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Aramide, FO, KK Alaneme, PA Olubambi e JO Borode. "In-Situ Synthesis of Mullite Fibers Reinforced Zircon-Zirconia Refractory Ceramic Composite from Clay Based Materials". International Journal of Materials and Chemistry, 2015. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1001844.

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Abstract Understanding the phase transformations/developments that result due to varying the production parameter of engineering materials is vital to development of new materials. The effects of yttria and niobium oxide on the phase changes and mechanical properties of mullite fiber reinforced zircon-zirconia ceramic composites produced by in-situ sintering of raw materials was investigated. Varied amounts of powder zirconia, yttria and niobium oxide were mixed in a turbula mixer with a fixed composition of clay (70% volume) of known mineralogical composition and mechanically milled in a planetary ball mill. The blended powders/clay were compacted into standard sample dimensions, and finally fired at 1400°C and held at varied time of one, two and three hours. The fired samples were characterized using ultra-high resolution field emission scanning electron microscope (UHR-FEGSEM) equipped with energy dispersive spectroscopy (EDX), and X-ray diffractometry (XRD). Various mechanical properties of the sintered samples were also investigated. It was observed that the investigated mechanical properties (with the exception of shrinkages) improved with the amount of raw zirconia initially used in the samples. It was also observed that addition of niobium oxide favours the formation polymignite phase, while the presence of both yttria and niobium oxide in the raw materials resulted in the formation of fergusonite phase in the samples. Both additives favour the phase transformation of zirconia from monoclinic to tetragonal and cubic phases even at temperature as low as 1400°C. It was concluded that the improved mechanical properties of the samples was due to strengthening by both mullite fibers reinforcement and phase transformation strengthening.

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Hilbert, Timothy J. "Factors associated with Reader Disagreement in a 20-year Radiology Study". University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1242835896.

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Hýbal, Ondřej. "Vývoj keramické skořepinové formy pro výrobu rozměrných Al odlitků". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-382053.

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This diploma thesis deals with the choice of the most suitable composition of a ceramic shell mold for aluminum castings made by investment casting technology. The most suitable composition of the ceramic shells is chosen based on the results of the tests and from economic point of view. This thesis also deals with evaluation of the current conditions of the production of ceramic shells in Alucast, s.r.o and recommendations for stabilizing the process of manufacturing ceramic shell molds.

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Heckman, Elizabeth Pierce. "Functionalizing Ceramic Matrix Composites by the Integration of a Metallic Substructure with Comparable Feature Size". Wright State University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=wright1621451032485832.

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Kubů, Marek. "Návrh zefektivnění technologie obrábění komínové vložky". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241905.

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Diploma thesis contains introduction of a company P-D Refractories CZ a. s., where the manufacture of ceramic chimney liners is. Followed by a description and analysis of the product in the entire production cycle, material and product spectrum. Based on the results of current production is created proposal to streamline the machining technology with a view to increase productivity and reduce defective products, which means determine the material of a tool and the method of machining. The work is finished by technical-economic assessment, where the summary and recommendation of the proposed solution are.

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Più fonti

Libri sul tema "Refractory ceramic"

DeSapio, Vincent. Refractory ceramic products. Washington, DC: Office of Industries, U.S. International Trade Commission, 1993.

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DeSapio, Vincente. Refractory ceramic products. Washington, DC: Office of Industries, U.S. International Trade Commission, 1993.

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S, Jacobson Nathan, Miller Robert A e United States. National Aeronautics and Space Administration., a cura di. Refractory oxide coatings on SiC ceramics. [Washington, DC]: National Aeronautics and Space Administration, 1994.

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M, Gallois Bernard, Lee Woo Y, Pickering Michael A e Materials Research Society, a cura di. Chemical vapor deposition of refractory metals and ceramics III: Symposium held November 28-30, 1994, Boston, Massachusetts, U.S.A. Pittsburgh, Pa: Materials Research Society, 1995.

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Hocking, M. G. Metallic and ceramic coatings: Production, high temperature properties and applications. London: Longman Scientific & Technical, 1989.

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Pivinskiĭ, I︠U︡ E. Kvart︠s︡evai︠a︡ keramika i ogneupory. Moskva: Teploėnergetik, 2008.

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Hocking, M. G. Metallic and ceramic coatings: Production, high temperature properties, and applications. Harlow, Essex, England: Longman Scientific & Technical, 1989.

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International Meeting on Modern Ceramics Technologies (12th 2010 Montecatini Terme, Italy). Refractories: Recent developments in materials, production and use : 12th international congress, part 1. Stafa-Zuerich: Trans Tech Pub. ltd. on behalf of Techna Group, 2011.

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B, Dahotre Narendra, e Sudarshan T. S. 1955-, a cura di. Intermetallic and ceramic coatings. New York: Marcel Dekker, 1999.

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M, Hampikian Janet, Dahotre Narendra B, Minerals, Metals and Materials Society. Surface Modification and Coatings Technologies Committee., Minerals, Metals and Materials Society. Corrosion & Environmental Effects Committee. e Minerals, Metals and Materials Society. Meeting, a cura di. Elevated temperature coatings: science and technology III: Proceedings of a symposium sponsored by the Surface Modification and Coatings Technology Committee of the Materials Processing and Manufacturing Division (MPMD) of TMS, and by the Joint TMS/ASM Corrosion and Environmental Effects Committee of the Structural Materials Division (SMD) of TMS, held during the 1999 TMS Annual Meeting in San Diego, California, February 28-March 4, 1999. Warrendale, Penn: Minerals, Metals & Materials Society, 1999.

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Capitoli di libri sul tema "Refractory ceramic"

Ventura, Joe, e Daniel M. Wood. "Refractory Ceramic Fibers". In 70th Conference on Glass Problems: Ceramic Engineering and Science Proceedings, Volume 31, Issue 1, 175–77. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470769843.ch18.

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Smith, Jeffrey D., e William G. Fahrenholtz. "Refractory Oxides". In Ceramic and Glass Materials, 87–110. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-73362-3_6.

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Bennett, James P., e Kyei-Sing Kwong. "Refractory Recycling - Concept to Reality". In Ceramic Transactions Series, 3–14. 735 Ceramic Place, Westerville, Ohio 43081: The American Ceramic Society, 2012. http://dx.doi.org/10.1002/9781118371435.ch1.

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Badmos, A. Y., e S. A. Abdulkareem. "New Porosity Inducing Material for Refractory Bricks". In Ceramic Transactions Series, 137–47. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470930953.ch15.

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Pötschke, Jürgen. "Formation and Behavior of Ceramic Inclusions". In Refractory Fundamentals in Metallurgical Practice, 203–9. Cham: Springer Nature Switzerland, 2024. https://doi.org/10.1007/978-3-031-63709-4_8.

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Comrie, Douglas C., e Waltraud M. Kriven. "Composite Cold Ceramic Geopolymer in a Refractory Application". In Ceramic Transactions Series, 211–25. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118406892.ch14.

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Varghese, B., R. Zoughi, C. DeConink, M. Velez e R. Moore. "Frequency Modulated Continuous Wave Monitoring of Refractory Walls". In Ceramic Transactions Series, 159–66. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118407004.ch16.

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Cook, R., C. Klein e H. Armstrong. "Refractory Adhesives for Bonding of Polymer Derived Ceramics". In Ceramic Transactions Series, 167–71. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2017. http://dx.doi.org/10.1002/9781119407270.ch17.

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Zirczay, G. N. "Monolithic Refractory Problems in a Gasifier". In Ceramic Engineering and Science Proceedings, 293–300. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2008. http://dx.doi.org/10.1002/9780470320310.ch27.

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Goski, Dana G., Timothy M. Green e Dominic J. Loiacona. "Refractory Ceramic Lining Selection and Troubleshooting in Thermal Biomass Operations". In Ceramic Transactions Series, 37–46. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118585160.ch4.

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Atti di convegni sul tema "Refractory ceramic"

Yahya, Hamdan, Aspaniza Ahmad, Muhammad Afiq Afandi Abdul Aziz e Malek Selamat. "Effect of Calcite Addition on the Mechanical Strength of Corundum-Mullite Ceramics". In International Conference on X-Rays and Related Techniques in Research and Industry 2023, 21–27. Switzerland: Trans Tech Publications Ltd, 2025. https://doi.org/10.4028/p-z9yfky.

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Efforts to reduce the usage of imported raw materials in the ceramic industry have encouraged usage of local calcite minerals for production of refractory ceramic products. Corundum-mullite ceramics as refractory products were prepared by using clay, alumina and calcite mineral (CaO) via powder pressing method. The effect of CaO addition from 2.9 to 6.5 wt.% (R1, R2 & R3) on the mechanical strengths such as bulk density, apparent porosity, firing shrinkage and compressive strength were systematically studied as well as the reheat shrinkage and crystallinity of mullite ceramic bodies. The results indicated that the sintering process was prevented by the formation of anorthite phase at higher CaO content. The bulk density increased continuously as the CaO content was increased from 2.9 to 6.5 wt.%, while the apparent porosity and water absorption decreased with the increment of CaO content especially at temperature 1400 °C. On the other hand, addition of small amount of CaO have improved compressive strength of the ceramic body due to reduction in porosity and increase of crystalline phase. Addition of CaO content higher than 4.8 wt.%, would result in increment of crystallinity of the body due to formation of anorthite phase. It was observed that the R1 body (2.9 wt.% CaO) has the lowest reheat shrinkage percentage compared to other bodies and has complied with the Japanese Industrial Standard of mullite refractory product which is lower than 0.2% shrinkage percentage at 1300°C in the furnace for 8 hours.

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Bell, Samuel B. W., Bruce A. Pint, Mackenzie J. Ridley e Sebastien N. Dryepondt. "High Temperature Mechanical Behavior of Refractory Alloys with Digital Image Correlation". In AM-EPRI 2024, 62–73. ASM International, 2024. http://dx.doi.org/10.31399/asm.cp.am-epri-2024p0062.

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Abstract Gas turbine efficiency is typically limited by the maximum allowable temperature for components at the inlet side and in the hot gas flow. Refractory alloys and SiC/SiC ceramic-matrix composites (CMCs) are promising candidates for advancing operating temperatures beyond those of Ni-based alloys (>1200 °C). Refractory alloys are more suitable than SiC/SiC CMCs for dynamic components, due to the latter's low toughness and ductility. However, it is well known that refractory alloys suffer from poor oxidation behavior under service lifetimes and conditions, leading to embrittlement concerns. The ARPA-E ULTIMATE program has set out to combine new alloys with advanced coatings to mitigate oxidation/embrittlement effects, while increasing the mechanical performance benefits of refractory materials. Low oxygen (inert gas) or vacuum systems are needed to assess high temperature mechanical performance of developed alloys. To investigate the environmental sensitivity of candidate alloys and develop high temperature testing capabilities, four argon tensile frames were upgraded as well as a single vacuum system at Oak Ridge National Laboratory. Digital image correlation was incorporated into the vacuum frame allowing for surface strain determination and refined insight into thermomechanical response. Creep testing was performed at 1300 °C on two alloys, C-103 and MHC in vacuum and high purity argon environments. The Mo-based alloy showed less sensitivity to oxygen, indicating that testing in well-controlled argon environments may be suitable. The C-103 alloy demonstrated a stronger sensitivity to oxygen in the well-controlled argon environment, illustrating the need for the developed vacuum testing capabilities. “Small” 25 mm and “large” 76 mm MHC specimens showed comparable results in terms of strain rate during creep testing and ultimate tensile strength during tensile testing, suggesting the viability of smaller geometries that use less material of advanced developmental alloys.

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"Recycling of Ceramic Refractory Materials". In Nov. 18-19, 2019 Johannesburg (South Africa). Eminent Association of Pioneers, 2019. http://dx.doi.org/10.17758/eares8.eap1119230.

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Ishikawa, Y., e K. Hamashima. "Pt Thermal Sprayed Coating on Refractory-Bricks for Glass Melting". In ITSC2011, a cura di B. R. Marple, A. Agarwal, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima e A. McDonald. DVS Media GmbH, 2011. http://dx.doi.org/10.31399/asm.cp.itsc2011p0821.

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Abstract The dense refractory is applied for the high-temperature glass melting equipment. Furthermore, platinum or its alloy-clad refractory bricks are utilized to melt high quality glass in fields of optical and display glasses. From the viewpoint of the resource saving of rare metal, the decreasing of Pt-consumption is very serious problem for glass manufacturing. The platinum thermal spray coating is effective alternative technology to solve this problem for platinum cladding. A Pt-spray coated ceramics is difficult to get reliability due to the large difference of thermal expansion between the ceramic and the metal. In this study, we have investigated the bond strength of the platinum coat on the dense refractories which was textured by the mechanical process. As a result, the bond strength between the ceramic and the metal is 3-5 MPa. It is almost the same as the thermal spray ceramics coating on the metal. Furthermore, in case of the ceramics substrate that contains the glass phase, the bond strength between the ceramic and the metal increased to 14-17 MPa after 1773 K heat treatment.

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Kustovskyi, Dmytro, Oleksandr Vasylchuk e Viktor Bilorusets. "The process of degradation of ceramic balls made of Si3N4-based materials in hybrid bearings". In IXth INTERNATIONAL SAMSONOV CONFERENCE “MATERIALS SCIENCE OF REFRACTORY COMPOUNDS”. Frantsevich Ukrainian Materials Research Society, 2024. http://dx.doi.org/10.62564/m4-dk1802.

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The characteristic operating parameters for such equipment, like aviation GTEs, primarily include high speeds of the power shaft rotation and, consequently, high mechanical and thermal loads on the bearings. Ceramic materials, i.e., hybrid bearings, are proposed for the rolling elements in these bearing units. Ensuring the operational safety of bearings of this class, the problem of predicting wear of their components, is extremely relevant. In our work, we investigate the patterns of the degradation process and determine the optimal composition and structure of sintered ceramics for bearing rolling elements. Search for optimal sintering parameters for materials that provide corresponding physico-mechanical properties[1]. Methods for assessing the degradation of investigated materials after operation under specific conditions: Morphometric analysis of wear products. Various types of microscopy and profilometry of damaged surfaces of ceramic balls. Methods for analyzing the operational characteristics of the "in situ" unit[3][4]: Changes in the unit's vibration spectrum[2]. Changes in the spectrum of acoustic emission. Changes in temperature[2]. Resource prediction based on the analysis of obtained data. Various types of ceramics were considered for the study, among which Si3N4-based material proved to be the best. Microscopy and profilometry revealed changes in surface roughness and the formation of characteristic "material tears" and "pits", known as pitting corrosion. This is a specific case of fretting corrosion, which occurs during the cyclic movement of two contacting surfaces. The images show that the pits have a layered shape, torn due to the formation of subsurface cracks. The structure of the materials of worn balls, the surfaces of which are covered with "pits", has a fragmented structure consisting of particles smaller in size than the original powder used for sintering. The research suggests dividing the operational process into stages: I - cyclic loading of ceramic balls of the hybrid friction pair rolling at high temperatures until the initial damage is detected; II - accumulation of damage in the surface layer due to contact fatigue and initiation of subsurface cracks in ceramic balls; III - formation of surface pitting.

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Derev'yanko, Oleksandr, Tetyana Istomina, Roman Lytvyn, Oleksandr Myslyvchenko, Dmytro Verbylo e Ostap Zgalat-Lozynskyy. "Ceramic material based on TiB2-FeSi using the reaction sintering method under SPS conditions". In IXth INTERNATIONAL SAMSONOV CONFERENCE “MATERIALS SCIENCE OF REFRACTORY COMPOUNDS”. Frantsevich Ukrainian Materials Research Society, 2024. http://dx.doi.org/10.62564/m4-od1542.

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When creating new heterogeneous structural materials based on TiB2, the addition of binding components [1]. This has a positive effect on wear resistance, strength, and crack resistance. One of the promising directions for the consolidation of ceramics based on TiB2 is the use of spark plasma sintering (SPS) technology. In order to obtain a ceramic composite material based on the TiB2-FeSi composition, a mixture of powders with a composition (vol. fr.) of 27%TiH1.5-62%TiB2-9%TiSi2-2%Fe was used [2]. The SPS process was performed without the use of a protective chamber with a vacuum/gas environment [3]. The total duration of electromechanical processing was 210 s. The required temperature level of 970 С was reached in the first 60 s. The last 150 s was spent isothermally holding at the specified temperature. The total electric current through the mold was constant after 60 s, and was kept at 2.0 kA, as was the temperature. The mechanical load during SPS was at the level of 35-40 MPa. X-ray structural analysis showed a difference in the composition from the initial one, which was obtained after mixing the components. Vickers HV microhardness measurement at a load of 100g showed an average value at the level of 19.7-22.39 GPa. Rockwell hardness was 75-77 HRC units. Ceramic fracture occurs at 112.2 MPa per bend without, in fact, deformation of the tested material. Research has shown that it is quite possible to obtain ceramics based on TiB2-FeSi by the SPS method without the use of a vacuum, gas, etc. environment and in a fairly short period of time in comparison with the known methods of obtaining ceramics based on TiB2. Also, in contrast to hot pressing in a vacuum, a rather small mechanical load is used for pressing. Under such insignificant conditions of electro-mechanical load and a short SPS time, sufficient mechanical characteristics of ceramics were obtained, which allow its use as a cutting tool or a sliding body in friction pairs.

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Root, D., J. Treadway, S. Chen e M. Pearce. "453. Exposure Data for Refractory Ceramic Fiber". In AIHce 1996 - Health Care Industries Papers. AIHA, 1999. http://dx.doi.org/10.3320/1.2765139.

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"Recycling of Ceramic Refractory Materials: Process Steps". In Nov. 18-19, 2019 Johannesburg (South Africa). Eminent Association of Pioneers, 2019. http://dx.doi.org/10.17758/eares8.eap1119231.

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Soda, T., H. Tamura e A. B. Sawaoka. "Refractory Carbide Coatings Sprayed by Electrothermal Explosion of Conductive-Ceramic Powders". In ITSC 1998, a cura di Christian Coddet. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.itsc1998p1351.

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Abstract Thermal Spray Coatings were prepared by the electrothermal explosions of ceramic powders caused by high-voltage electrical breakdown and large-current Joule heating. The powders of tantalum carbide, tungsten carbide and titanium carbide were sprayed without any additives. Even these hard-sintered materials could be densely deposited to form their coatings on metal substrates. The deposits ranged several tens tm in thickness. The Vickers microhardness of the coatings was much closer to those of the ceramics. This new spray technique employed a powder container which was especially designed in order to heat effectively the powder up to its melting point. The increase of tensile strength of the powder container enhanced the heating of the ceramic particles and jetting of them from the container. Thus the mixing of the sprayed ceramics with the substrate surfaces was obtained in the range of a few tens ìm. However, the decarburization of the TaC and TiC powders were caused under the spraying, followed by the change of lattice constants. The deposition of WC coating resulted in phase change due to the decarburization.

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Fesenko, Igor, Oksana Kaidash e Nina Sergienko. "Electrical Resistivity of AlN-hBN-TiB2 Ceramic Composite". In IXth INTERNATIONAL SAMSONOV CONFERENCE “MATERIALS SCIENCE OF REFRACTORY COMPOUNDS”. Frantsevich Ukrainian Materials Research Society, 2024. http://dx.doi.org/10.62564/m4-if2339.

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Dielectric matrix ceramic composites based on high thermal conductivity AlN are important for engineering of new electronic devices with lower operation temperature. Composites of AlN dielectric matrix with electroconductive inclusions of TiB2 have been prepared and investigated with the aim to establish their electrical resistivity for possible applications. The ceramic composites AlN–hBN–TiB2 have been prepared by hot pressing (T=1950 °С, P=30 MPa) with TiB2 content from 45 to 66 wt.%. The four-probe electrical resistivity measurements of as-obtained specimen at room temperature showed correspondingly values between 1.0•10–5 and 0.2•10–5 Ohm•m. The observed relatively small decrease of electrical resistivity of the hot-pressed AlN–hBN–TiB2 system composite for increasing conductive phase content by 21 wt.%, and when conductive phase content is higher than a percolation threshold may testify in favor of a tunnel character of charge transfer, discussed in [1]. Addition of hBN under mixing of the starting powder system may form an additional dielectric layer at the surface of the conductive particles (TiB2). Thus a tunnel mechanism of charge transfer in the hot-pressedAlN–hBN–TiB2 ceramic composites may dominate in a wide region of concentrations including the percolation threshold.

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Rapporti di organizzazioni sul tema "Refractory ceramic"

Dale E. Brown e Puja B. Kadolkar. Development of Cost-Effective Low-Permeability Ceramic and Refractory Components for Aluminum Melting and Casting. Office of Scientific and Technical Information (OSTI), dicembre 2005. http://dx.doi.org/10.2172/878541.

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Kadolkar, Puja, e Ronald D. Ott. Development of Cost-Effective Low-Permeability Ceramic and Refractory Components for Aluminum Melting and Casting. Office of Scientific and Technical Information (OSTI), febbraio 2006. http://dx.doi.org/10.2172/930713.

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Paul Brown. NANOSTRUCTURED CERAMICS AND COMPOSITES FOR REFRACTORY APPLICATIONS IN COAL GASIFICATION. Office of Scientific and Technical Information (OSTI), gennaio 2005. http://dx.doi.org/10.2172/840414.

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Besmann, Theodore M., Bernard M. Gallois e James W. Warren. Chemical Vapor Deposition of Refractory Metals and Ceramics 2. Materials Research Society Symposium Proceedings Held in Boston, Massachusetts on December 4-6, 1991. Volume 250. Fort Belvoir, VA: Defense Technical Information Center, aprile 1993. http://dx.doi.org/10.21236/ada265072.

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Criteria for a recommended standard: occupational exposure to refractory ceramic fibers. U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, maggio 2006. http://dx.doi.org/10.26616/nioshpub2006123.

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Survey report: an engineering control evaluation for reducing exposure to refractory ceramic fibers during sanding conducted at Fireline, Inc. Youngstown, Ohio. U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, aprile 2003. http://dx.doi.org/10.26616/nioshephb24611a.

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