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Directionally Solidified Ceramic Eutectics for High-Temperature Applications

Directionally Solidified Ceramic Eutectics for High-Temperature Applications

Iurii Bogomol, Petro Loboda
Copyright: © 2013 |Pages: 20
ISBN13: 9781466640665|ISBN10: 1466640669|EISBN13: 9781466640672
DOI: 10.4018/978-1-4666-4066-5.ch010
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MLA

Bogomol, Iurii, and Petro Loboda. "Directionally Solidified Ceramic Eutectics for High-Temperature Applications." MAX Phases and Ultra-High Temperature Ceramics for Extreme Environments, edited by I. M. Low, et al., IGI Global, 2013, pp. 303-322. https://doi.org/10.4018/978-1-4666-4066-5.ch010

APA

Bogomol, I. & Loboda, P. (2013). Directionally Solidified Ceramic Eutectics for High-Temperature Applications. In I. Low, Y. Sakka, & C. Hu (Eds.), MAX Phases and Ultra-High Temperature Ceramics for Extreme Environments (pp. 303-322). IGI Global. https://doi.org/10.4018/978-1-4666-4066-5.ch010

Chicago

Bogomol, Iurii, and Petro Loboda. "Directionally Solidified Ceramic Eutectics for High-Temperature Applications." In MAX Phases and Ultra-High Temperature Ceramics for Extreme Environments, edited by I. M. Low, Y. Sakka, and C. F. Hu, 303-322. Hershey, PA: IGI Global, 2013. https://doi.org/10.4018/978-1-4666-4066-5.ch010

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Abstract

The processing techniques, microstructures, and mechanical properties of directionally solidified eutectic ceramics are reviewed. It is considered the main methods for preparing of eutectic ceramics and the relationships between thermal gradient, growth rate, and microstructure parameters. Some principles of coupled eutectic growth, main types of eutectic microstructure and the relationship between the eutectic microstructure and the mechanical properties of directionally solidified eutectics at ambient and high temperatures are briefly described. The mechanical behavior and main toughening mechanisms of these materials in a wide temperature range are discussed. It is shown that the strength at high temperatures mainly depends on the plasticity of the phase components. By analyzing the dislocation structure, the occurrence of strain hardening in single crystalline phases during high-temperature deformation is revealed. The creep resistance of eutectic composites is superior to that of the sintered samples due to the absence of glassy phases at the interfaces, and the strain has to be accommodated by plastic deformation within the domains rather than by interfacial sliding. The microstructural and chemical stability of the directionally solidified eutectic ceramics at high temperatures are discussed. The aligned eutectic microstructures show limited phase coarsening up to the eutectic point and excellent chemical resistance. Directionally solidified eutectics, especially oxides, revealed an excellent oxidation resistance at elevated temperatures. It is shown sufficient potential of these materials for high-temperature applications.

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