Chapter 3. Synthesis of Composites In Situ Using Displacement Reactions

  1. John B. Wachtman Jr.
  1. C. H. Henager Jr.1,
  2. J. L. Brimhall1 and
  3. J. P. Hirth2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470313978.ch3

Proceedings of the 16th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 13, Issue 9/10

Proceedings of the 16th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 13, Issue 9/10

How to Cite

Henager, C. H., Brimhall, J. L. and Hirth, J. P. (1994) Synthesis of Composites In Situ Using Displacement Reactions, in Proceedings of the 16th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 13, Issue 9/10 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470313978.ch3

Author Information

  1. 1

    Pacific Northwest Laboratory, Battelle Blvd., Richland, WA 99352

  2. 2

    Washington State University, Dept. of Mechanical and Materials Eng., Pullman, WA 99164

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1994

ISBN Information

Print ISBN: 9780470375198

Online ISBN: 9780470313978

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Keywords:

  • inclusions;
  • analyzed;
  • microstructures;
  • thermomechanical;
  • analytical solutions

Summary

Solid state displacement reactions are being studied at Pacific Northwest Laboratory as a method of synthesizing intermetallic and ceramic composites in situ. A nanometer-scale interwoven composite was synthesized using a displacement reaction at 600 °C between thin, alternating-layers of Fe/NiO. A high-strength in situ composite of MoSi2/SiC was synthesized using a displacement reaction between Mo2C and Si by blending Mo2C and Si powders and vacuum hot-pressing the powders. The resulting microstructure consisted of 1-μm diameter SiC particles (30 vol%) uniformly dispersed in a fine-grained MoSi2 matrix. Bend bars and chevronnotched bars revealed a strength of 475 MPa and a fracture toughness of 6.7 MPa √m at room temperature. Bend strength increased to 515 MPa at 1000 °C and fracture toughness increased to 105 MPa√m at 1050 °C.