Chapter 2. ZrO2-Reinforced MoSi2 Matrix Composites

  1. John B. Wachtman Jr
  1. J. J. Petrovic1,
  2. R. E. Honnell1,
  3. T. E. Mitchell1,
  4. R. K. Wade2 and
  5. K. J. McClellan3

Published Online: 26 MAR 2008

DOI: 10.1002/9780470313848.ch2

Proceedings of the 15th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 12, Issue 9/10

Proceedings of the 15th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 12, Issue 9/10

How to Cite

Petrovic, J. J., Honnell, R. E., Mitchell, T. E., Wade, R. K. and McClellan, K. J. (1991) ZrO2-Reinforced MoSi2 Matrix Composites, in Proceedings of the 15th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 12, Issue 9/10 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470313848.ch2

Author Information

  1. 1

    Ceramic Science and Technology Group Los Alamos National Laboratory Los Alamos, NM 87545

  2. 2

    Arizona Materials Laboratory University of Arizona Tucson, AZ 85721

  3. 3

    Department of Materials Science and Engineering Case Western Reserve University Cleveland, OH 44106

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1991

ISBN Information

Print ISBN: 9780470375105

Online ISBN: 9780470313848

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Keywords:

  • microcracking;
  • thermodynamically;
  • electrodischarge;
  • composite;
  • microstructure

Summary

ZrO2 particle-MoSi2 matrix composites were fabricated by wet processing/hot pressing, using high-quality unstabilized, partially stabilized, and fully stabilized ZrO2 powders. Composite room temperature indentation fracture toughness increased with increasing volume fraction of ZrO2 reinforcement. Unstabilized ZrO2 produced the highest composite fracture toughness, 7.8 MPa-m1/2 as compared to 2.6 MPa-m1/2 for pure MoSi2 Unstabilized ZrO2 composites exhibited matrix microcracking, and the spontaneous tetragonal-to-monoclinic ZrO2 phase transformation induced significant plastic deformation in the MoSi2 matrix. Partially stabilized Zro2 produced a lesser extent of composite fracture toughening, possibly as a result of an inhomogeneous Zro2 particle distribution and presence of a glassy phase.