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Feasibility for Improving Ambient Temperature Toughness of MOSI2 and its Composites.
Final rept. 1 Mar 94-1 Mar 97,
STATE UNIV OF NEW YORK AT STONY BROOK DEPT OF MATERIALS SCIENCE AND ENGINEERIN G
Pagination or Media Count:
Due to its high melting point and oxidation resistance, molybdenum disilicide MoSi2 is a candidate for high temperature structural components. However, in order for MoSi2 to be applicable for these applications, the high temperature creep resistance and low temperature fracture toughness of the compound need to be substantially improved. In this ONR sponsored study, we are examining the effects of processing on the resulting microstructure and properties of reinforced and unreinforced MoSi2. Samples have been obtained from several laboratories with the goal of determining the effects of purity and processing. The results indicate that a finer grain size in combination with the addition of small particles, whether silica, SiC, or precipitates, contributes to the improvement in the materials low temperature fracture toughness.
APPROVED FOR PUBLIC RELEASE