Chapter 62. Processing and Microstructure of a Ce-Doped IN SITU O'+β′ SiAION Composite

  1. John B. Wachtman Jr.
  1. Chao M. Huang1,
  2. Youren Xu1,
  3. Avigdor Zangvil1,
  4. Waltraud M. Kriven1 and
  5. Dennis N. Coon2

Published Online: 28 MAR 2008

DOI: 10.1002/9780470314555.ch62

Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - B: Ceramic Engineering and Science Proceedings, Volume 15, Issue 5

Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - B: Ceramic Engineering and Science Proceedings, Volume 15, Issue 5

How to Cite

Huang, C. M., Xu, Y., Zangvil, A., Kriven, W. M. and Coon, D. N. (1994) Processing and Microstructure of a Ce-Doped IN SITU O'+β′ SiAION Composite, in Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - B: Ceramic Engineering and Science Proceedings, Volume 15, Issue 5 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314555.ch62

Author Information

  1. 1

    Department of Matenals Science and Engineering and Materials Research Laboratory, University of Illinois at Urbana, Urbana, IL 61801

  2. 2

    Department of Mechanical Engineering, University of Wyoming, Lararrae, WY 82071

Publication History

  1. Published Online: 28 MAR 2008
  2. Published Print: 1 JAN 1994

ISBN Information

Print ISBN: 9780470375334

Online ISBN: 9780470314555

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Keywords:

  • kinetics of densification;
  • kingerq's liquid-phase sintering model;
  • particle rearrangemen;
  • solution-reprecipitation;
  • microchemical characterization

Summary

O's+β's SIAION 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-x-AlxN2-xOl+x) had an x value of 0.14, while the β1 phase (Si6-zAlzOzN8-z) had a z value smaller than 0.8. The O' phase exhibited rod-like grains of length 20 ∼30 μm and a mean aspect ratio of 12.5, while the β′ phase contained needle-like grains with lengths smaller than 1 μm.