Chapter 4. Oxidation Behavior of MoSi2 Composites

  1. John B. Wachtman Jr
  1. J. Cook,
  2. R. Mahapatra,
  3. E. W. Lee,
  4. A. Khan and
  5. J. Waldman

Published Online: 26 MAR 2008

DOI: 10.1002/9780470313848.ch4

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

Cook, J., Mahapatra, R., Lee, E. W., Khan, A. and Waldman, J. (1991) Oxidation Behavior of MoSi2 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.ch4

Author Information

  1. Naval Air Development Center Warminster, PA 18974--5000

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:

  • oxidation;
  • composites;
  • aluminides;
  • molybdenum;
  • isothermal

Summary

The oxidation behavior of MoSi2 composites prepared by the XDTM process with a variety of reinforcements was investigated. Isothermal oxidation tests were conducted in air at temperatures ranging from 800° to 1500°C for 24 h. Cyclic oxidation tests were performed by exposing the specimens for 55 min at 1200° and 1500°C and cooling down to room temperature for 5 min. The pesting behavior of the composites was examined by exposing the specimens to temperatures ranging from 450° to 550°C for 48 h following cyclic exposure. The results show that the composites of MoSi2 with silicon carbide have the best oxidation resistance among the composites examined. The oxide that formed on MoSi2/SiC XDTM composite consisted of a continuous stable layer of silicon dioxide (SiO2). The MoSi2 XDTM with boride-based composites, on the other hand, formed semi-adherent scales of Si02; TiO2, ZrO2, or HfO2; and B2O3. Pesting was not observed in any of the MoSi2 XDTM composites examined.