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- Title
Microstructural and Mechanical Characterization of Pressure-Less Sintered AlN-polytypoid Based Composites by Compositional Design.
- Authors
Huang, Saifang; Huang, Zhaohui; Liu, Yan-gai; Fang, Minghao; Yin, Li; Huang, Juntong; Lloyd, I.
- Abstract
AlN-polytypoid materials are hard to be sintered and usually need a hot-pressing ( HP) technique and very high sintering temperatures (≥1750°C). In this study, densified AlN-polytypoid based composites were successfully fabricated in situ via a pressureless sintering method at a relatively lower temperature of 1650°C by compositional design. Moreover, the room temperature mechanical properties of the composites were comparable with those sintered by HP method. The results showed that 15 R-based composite was sintered via a transient liquid-phase sintering mechanism with the aid of U-phase Sialon. The pressureless-sintered composites were mainly composed of platelet 15 R, hexagonal β- Sialon, and intergranular U-phase Sialon grains, which exhibited both intercrystalline and transcrystalline fracture behaviors. Partial 15 R grains were of twin structure, which was found to be positive for toughening of the composites.
- Publication
Journal of the American Ceramic Society, 2012, Vol 95, Issue 6, p2044
- ISSN
0002-7820
- Publication type
Article
- DOI
10.1111/j.1551-2916.2012.05176.x