Abstract
MoSi2-oxides composites using fine aluminosilicate powder (<0.2, μm) have demonstrated excellent low temperature oxidation resistance and thermal shock resistance. These properties strongly depend on microstructural morphology and are obtained in composites that network-structures of both phases of MoSi2 and oxides are developed, i.e., in composites with oxides of 20-40 vol.%. When one phase is independently dispersed in the other phase, on the other hand, problems of low temperature oxidation and thermal shock occur. The low temperature oxidation problem occurs in the composites with oxides less than 15 vol.% and the thermal shock problem occurs in the composites with oxides more than 50 vol.%. These results will contribute to material design approaches for high temperature structural applications of MoSi2.
