Chapter 60. Mechanical Alloying of Mo and Si Powders and Their Sintering

  1. John B. Wachtman Jr.
  1. X. Yang and
  2. M. N. Rahaman

Published Online: 26 MAR 2008

DOI: 10.1002/9780470314234.ch60

Proceedings of the 17th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 14, Issue 9/10

Proceedings of the 17th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 14, Issue 9/10

How to Cite

Yang, X. and Rahaman, M. N. (1993) Mechanical Alloying of Mo and Si Powders and Their Sintering, in Proceedings of the 17th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 14, Issue 9/10 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314234.ch60

Author Information

  1. Department of Ceramic Engineering University of Missouri-Rolla Rolla, MO 65401

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1993

ISBN Information

Print ISBN: 9780470375273

Online ISBN: 9780470314234

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Keywords:

  • sintering;
  • crystallite;
  • parameters;
  • metallic contamination;
  • microstructure

Summary

The preparation of MoSi2 powders by the mechanical alloying of Mo and Si powders in a high speed ball mill was investigated. The phase composition, crystal structure and powder characteristics were studied as functions of the milling conditions. Single phase MoSi2 powders with a particle size of 0.1–1 μm and a crystallite size of =20 nm were prepared. The free sintering behavior of the compacted powders was studied under controlled heating conditions in a helium atmosphere. The MoSi2 powder reached a density of >95% of the theoretical after heating for 1 hour at 1600° C. Addition of 1 wt% of carbon produced an increase in density to >98%. The phase composition of the sintered body was primarily tetragonal MoSi2 containing a small amount of a Si-rich phase. The grain size of the M0Si2 phase ≈ 1–3 μm.