Abstract
Vacuum plasma spraying has been used to fabricate dense MoSi 2 and SiC- and TiB 2-reinforced MoSi 2 composites. The deposits have a high hardness, indentation fracture toughness and flexural strength. It is observed that annealing leads to increases in fracture toughness and flexural strengths due to improved interparticle bonding. The incorporation of reinforcements in the MoSi 2 matrix leads to enhanced fracture toughness and flexural strength, indicating a strong matrix-particle bond. The oxidation resistance of the vacuum-plasma-sprayed MoSi 2 matrix is very good under cyclic and isothermal conditions. Although the incorporation of reinforcement leads to a degradation of oxidation resistance, the SiC-reinforced MoSi 2 composites have a far superior oxidation resistance than do the TiB 2-reinforced MoSi 2 composites.
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