Chapter 47. Processing, Characterization and Mechanical Behavior of Mo5Si3C

  1. Don Bray
  1. E. N. Ross and
  2. M. J. Kaufman

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294482.ch47

22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 19, Issue 3

22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 19, Issue 3

How to Cite

Ross, E. N. and Kaufman, M. J. (1988) Processing, Characterization and Mechanical Behavior of Mo5Si3C, in 22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 19, Issue 3 (ed D. Bray), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294482.ch47

Author Information

  1. Department of Materials Science and Engineering University of Florida Gainesville, FL 32611

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1988

ISBN Information

Print ISBN: 9780470375587

Online ISBN: 9780470294482

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Keywords:

  • hexagonal;
  • microscopy;
  • electron;
  • improvement;
  • hydraulic

Summary

In order to better understand the effects of increased symmetry and interstitial elements on the physical and mechanical properties of silicides, a ternary, hexagonal (D88, hP16) compound Mo5Si3C has been produced and characterized. During the processing phase of this study, due to difficulties in synthesizing single-phase material, it was proposed that the accepted Mo-Si-C isotherm was in error with respect to the homogeneity range of Mo5Si3C. Through a systematic investigation, it was confirmed that the single-phase Mo5Si3C region is in fact smaller than originally thought. Despite the constraints this placed on processing, fully dense samples of Mo5Si3C having a minor second phase constituent (∼ 5 Vol. %) were produced using blended powders and a two - stage hot pressing approach. Samples were characterizedby x-ray diffraction, scanning electron microscopy, electron probe microanalysis, and transmission electron microscopy. Preliminary determination of mechanical properties indicated that the Mo5Si3C compound is quite hard (12.9 GPa), has toughness values similar to other silicides (2.7 MPa m1/2), and displays some improvement in strength at temperature over MoSi2.