Chapter 36. Processing and Properties of SiC/MoSi2-SiC Composites Fabricated by Melt Infiltration

  1. Todd Jessen and
  2. Ersan Ustundag
  1. Ramakrishna T. Bhatt1 and
  2. Mohan G. Hebsur2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294628.ch36

24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 21, Issue 3

24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 21, Issue 3

How to Cite

Bhatt, R. T. and Hebsur, M. G. (2000) Processing and Properties of SiC/MoSi2-SiC Composites Fabricated by Melt Infiltration, in 24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 21, Issue 3 (eds T. Jessen and E. Ustundag), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294628.ch36

Author Information

  1. 1

    U.S. Army Research Laboratory NASA Glenn Research Center Cleveland, OH 44135

  2. 2

    Ohio Aerospace Institute NASA Glenn Research Center Cleveland, OH 44135

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2000

ISBN Information

Print ISBN: 9780470375686

Online ISBN: 9780470294628

SEARCH

Keywords:

  • laser machining;
  • ceramic matrix composites;
  • green silicon nitride;
  • arithmetic average surface roughness;
  • optical microscopy

Summary

Hi-Nicalon SiC fiber reinforced MoSi2-SiC matrix composites (SiC/MoSi2-SiC) have been fabricated by the melt infiltration approach. The composite consists of-60 vol%, 2-D woven BN/SiC coated Hi-Nicalon SiC fibers and ∼40 vol% MoSi2-SiC matrix. The room temperature tensile properties and thermal conductivity of the SiC/MoSi2-SiC composites were measured and compared with those of the melt infiltrated SiC/SiC composites. The influence of fiber architecture on tensile properties was also evaluated. Results indicate that the primary modulus, stress corresponding to deviation from linearity, and transverse thermal conductivity values for the SiC/MoSi2-SiC composites are significantly lower than those for the SiC/SiC composites. Microcracking of the matrix due to the large difference in thermal expansion between MoSi2 and SiC appears to be the reason for the lower matrix dominated properties of SiC/MoSi2-SiC composites.