Chapter 14. Fracture Behavior of MoSi2/Si3N4 Composite

  1. John B. Wachtman Jr
  1. Lynn J. Neergaard1 and
  2. John J. Petrovic2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470314715.ch14

Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 16, Issue 4

Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 16, Issue 4

How to Cite

Neergaard, L. J. and Petrovic, J. J. (1995) Fracture Behavior of MoSi2/Si3N4 Composite, in Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 16, Issue 4 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314715.ch14

Author Information

  1. 1

    New Mexico Institute of Mining and Technology Department of Materials and Metallurgical Engineering Socorro, NM 87801

  2. 2

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

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1995

ISBN Information

Print ISBN: 9780470375372

Online ISBN: 9780470314715

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Keywords:

  • microstructure;
  • indentation;
  • crack-microstructure;
  • pullout;
  • polycrystalline

Summary

Hot pressed MoSi2 particle/Si3N4 matrix composites with up to 50% MoSi2 were investigated. MoSi2 particles were initially 5-10 μ.m in diameter, and the Si3N4 powders were submicron. Microstructure, indentation fracture toughness, and crack-microstructure interaction were explored using Scanning Electron Microscopy (SEM). MoSi2 particles deformed and oriented during hot pressing. Toughness and hardness measured parallel and perpendicular to the hot press direction differed. Each composite composition had a rising R-curve and toughness increased with MoSi2 loading. Crack deflection and particle pullout were observed.