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[Untitled]
- Source :
- Journal of Materials Synthesis and Processing. 7:35-39
- Publication Year :
- 1999
- Publisher :
- Springer Science and Business Media LLC, 1999.
-
Abstract
- 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.
Details
- ISSN :
- 10647562
- Volume :
- 7
- Database :
- OpenAIRE
- Journal :
- Journal of Materials Synthesis and Processing
- Accession number :
- edsair.doi...........1c1cdd076790bd320899e3c0f5a51c30