Chapter 57. Indentation Testing of an Al2O3/SiC Whisker Composite

  1. John B. Wachtman Jr.
  1. Kristin Breder,
  2. Kaiyang Zeng and
  3. David J. Rowcliffe

Published Online: 26 MAR 2008

DOI: 10.1002/9780470310557.ch57

A Collection of Papers Presented at the 13th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 10, Issue 7/8

A Collection of Papers Presented at the 13th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 10, Issue 7/8

How to Cite

Breder, K., Zeng, K. and Rowcliffe, D. J. (1989) Indentation Testing of an Al2O3/SiC Whisker Composite, in A Collection of Papers Presented at the 13th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 10, Issue 7/8 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470310557.ch57

Author Information

  1. Department of Physical Metallurgy and Ceramics Royal Institute of Technology Stockholm, Sweden

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1989

ISBN Information

Print ISBN: 9780470374863

Online ISBN: 9780470310557

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Keywords:

  • matrix/whisker interfaces;
  • young's modulus;
  • chemical vapor infiltration;
  • anisotropy;
  • thermal expansion

Summary

Al2O3/SiC whisker composites prepared by hot pressing show a strong preferred orientation with virtually all the whiskers having their axes normal to the hot pressing direction. The resistance to cracking is likewise anisotropic, being 40% greater when the crack propagates so that it interacts with the largest fraction of whiskers having their axes normal to the crack plane and to the crack propagation direction. For other crack-whisker orientations the indentation, fracture toughness is less and can apparently be less than that of unreinforced alumina. This could be due to crack propagation along weak interfaces in orientations where crack deflection is at a minimum. These results suggest that a material with a more isotropic distribution of whiskers will have much better properties.