Abstract
MoSi2 based materials are considered to have potential for use in high temperature structural part. In this work, MoSi2/WSi2 composites have been successfully prepared by pressureless sintering from mechanically-assisted combustion synthesized powders. The size of green powders shows great impact on the properties of sintered samples. The sample obtained from smaller powders has finer microstructure, and its Vickers hardness, flexural strength and fracture toughness were as high as 10.78GPa, 327.21MPa and 7.32MPam1/2, respectively. The morphologies of the fractured surface of the composites revealed the mechanism to improve the mechanical properties of MoSi2 matrix. Moreover, this composite exhibits good oxidation resistance at low temperature. A continuous SiO2 layer was formed after exposure to air at 500°C for 120 hours, which could prevent further oxidation of the composite. [doi:10.2320/matertrans.M2014370]
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