Chapter 14. SiC Platelet Reinforced Al2O3 Composites by Free Sintering of Coated Powders

  1. John B. Wachtman Jr.
  1. X. Yang and
  2. M. N. Rahaman

Published Online: 28 MAR 2008

DOI: 10.1002/9780470314555.ch14

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

Yang, X. and Rahaman, M. N. (1994) SiC Platelet Reinforced Al2O3 Composites by Free Sintering of Coated Powders, 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.ch14

Author Information

  1. University of Missouri-Rolla, Ceramic Engineering Department Rolla, Missouri 65401

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:

  • sic platelets;
  • coated platelets;
  • constant heating rate;
  • controlled heterogeneous precipitation;
  • calcination

Summary

SiC platelets were coated with the required thickness of fine-grained Al2O3 powder by controlled heterogeneous precipitation from a solution. After calcination, the coated platelets were compacted and sintered at a constant heating rate of 5 °C/min in a helium atmosphere. The parameters which control the coating process and the sintering behavior of the coated platelets are outlined. Starting with an initial matrix density of 40–45% of the theoretical, composites containing ≈20 vol% platelets reached nearly full density after sintering at 1800 °C for 30 minutes. By comparison, similar composites formed by mechanical mixing of the SiC platelets and the precipitated Al2O3 powder reached a density of only ≈70 % of the theoretical under identical sintering conditions.