Processing and microstructure of a Ce-doped in situ O′+β′ SiAlON composite

Chao M. Huang, Youren Xu, Avigdor Zangvil, Waltraud M Kriven, Dennis N. Coon

Research output: Contribution to journalArticlepeer-review


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 languageEnglish (US)
Pages (from-to)1128-1137
Number of pages10
JournalCeramic Engineering and Science Proceedings
Issue number5
StatePublished - Sep 1994

ASJC Scopus subject areas

  • Ceramics and Composites


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