Chapter 39. Fabrication, Microstructure, and Properties of SiC-AIN Ceramic Alloys

  1. John B. Wachtman Jr.
  1. Ran-Rong Lee1 and
  2. Wen-Cheng Wei2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470313008.ch39

A Collection of Papers Presented at the 14th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 11, Issue 7/8

A Collection of Papers Presented at the 14th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 11, Issue 7/8

How to Cite

Lee, R.-R. and Wei, W.-C. (1990) Fabrication, Microstructure, and Properties of SiC-AIN Ceramic Alloys, in A Collection of Papers Presented at the 14th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 11, Issue 7/8 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470313008.ch39

Author Information

  1. 1

    Ceramics Process Systems Corporation Milford, MA 01757

  2. 2

    The Graduate Institute of Materials Engineering National Taiwan University Taipei, Taiwan, ROC

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1990

ISBN Information

Print ISBN: 9780470374924

Online ISBN: 9780470313008

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Keywords:

  • microstructure;
  • decomposition;
  • ceramics;
  • homogeneously;
  • densification

Summary

In-situ reinforced SiC-AIN ceramic alloys having unique microstructure and fracture toughness up to 5.5 MPa · m1/2 were successfully produced. The alloys can be pressureless-sintered to high density at 2050°C with 2 wt% yttria as a sintering aid. The sintered SiC-AIN alloys can achieve a single solid solution at temperatures higher than 2225°C. The lattice constants of the solid solution varied linearly with SiC/AIN ratio. Optimized annealing yielded decomposition of the solid solution and the formation of a unique microstructure, which was composed of elongated grains and equiaxed grains with modulated features. The ratio of the elongated grains and equiaxed grains can be controlled by the ratio of AIN to SiC. The SiC-rich elongated grains work a plateletlike dispersoids and increase the fracture toughness of the alloys.