Sintering Behavior of Hot-Pressed Ca–αSialon Ceramics

Journal of Materials Synthesis and Processing - Tập 7 - Trang 35-39 - 1999
Zhou Yanping1,2, Zhuang Hanrui1, Wen Shulin2
1Chinese Academy of Sciences, Shanghai Institute of Ceramics, Shanghai, P. R. China
2The State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, P. R. China

Tóm tắt

On the basis of phase relationships in the Ca–Si–Al–O–N system, a Ca–α–sialon ceramic was synthesized using the hot-pressing technique. The reaction sequences and densifications of the Ca–α–sialon vs. firing temperatures have been characterized in detail. The present experiments reveal a reaction sequence as follows: at 1250°C the reactant mixture started to soften, at 1300°C a gehlenite phase was produced, at 1500°C the gehlenite phase was resolved into a liquid phase and a Ca–α–sialon started to form, and at 1600°C the formation of Ca–α–sialon was complete. The product was stable and almost entirely single phase Ca–α–sialon. Accompanying to the above sequences, densification also proceeded via a liquid-phase sintering, particle rearrangement, solution–reprecipitation, and grain growth process. In the final microstructure elongated grains of Ca–α–sialon were obtained, improving the fracture toughness of this Ca–α–sialon ceramic.

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Thông tin xuất bản

Journal of Materials Synthesis and Processing

Tập 7

35-39

Thông tin tác giả