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In Situ Synthesis of A MoSi2/SiC Composite Using Solid State Displacement Reactions

Published online by Cambridge University Press:  15 February 2011

C. H. Henager Jr. ,
J. L. Brimhall ,
J. S. Vetrano  and
J. P. Hirth
C. H. Henager Jr.
Affiliation:
Pacific Northwest Laboratory, Battelle Blvd., Richland, WA 99352
J. L. Brimhall
Affiliation:
Pacific Northwest Laboratory, Battelle Blvd., Richland, WA 99352
J. S. Vetrano
Affiliation:
Pacific Northwest Laboratory, Battelle Blvd., Richland, WA 99352
J. P. Hirth
Affiliation:
Washington State University, Dept. of Mechanical and Materials Engr., Pullman, WA 99164
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Abstract

A high-strength in situ composite of MoSi2/SiC was synthesized using a solid state displacement reaction between Mo2C and Si by blending Mo2C and Si powders and vacuum hotpressing the powders at 1350°C for 2 h followed by 1 h at 1700°C. The resulting microstructure consisted of 1-μm diameter β-SiC particles (30 vol%) uniformly dispersed in a fine grained MoSi2 matrix. Transmission electron microscopy was used to study the fine-scale morphology and phase distribution of the composite. Evidence for a small amount of grain boundary glass phase was observed using diffuse dark field imaging. The β-SiC particles were distributed mainly on grain boundaries and triple points within the MoSi2 matrix. These findings were used to rationalize the observed mechanical property behavior.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 273: Symposium Q – Intermetallic Matrix Composites II , 1992 , 281
Copyright
Copyright © Materials Research Society 1992

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References

REFERENCES

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