Abstract
O′+β′ SiAlON mixed-phase composites were successfully fabricated in situ by pressureless sintering with CeO2 as a sintering aid. The kinetics of densification were studied using Kingery's liquid-phase sintering model. The densification was predominantly achieved by particle rearrangement and solution-reprecipitation. Phase formation started immediately after liquid formation. However, the saturation of phase formation required a prolonged sintering time after completion of densification. Microstructure and microchemical characterization revealed that the O′ phase (Si2-xAlxN2-xO1+x) had an x value of 0.14, while the β′ phase (Si6-zAlzOzN8-z) had a z value smaller than 0.8. The O′ phase exhibited rod-like grains of length 20 approximately 30 μm and a mean aspect ratio of 12.5, while the β′ phase contained needle-like grains with lengths smaller than 1 μm.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1128-1137 |
| Number of pages | 10 |
| Journal | Ceramic Engineering and Science Proceedings |
| Volume | 15 |
| Issue number | 5 |
| State | Published - Sep 1994 |
| Event | Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - B. Part 2 (of 2) - Cocoa Beach, FL, USA Duration: Jan 9 1993 → Jan 14 1993 |
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry