Abstract
A MoSi 2-based composite reinforced with 20 vol.% Si 3N 4 rodlike crystals was fabricated by Spark Plasma Sintering (SPS) process. The microstructure and mechanical properties of the composite were investigated. Relative densities of the monolithic material and composite were above 95%. No reactions between Si 3N 4 and MoSi 2 were observed. The composite containing Si 3N 4 rodlike crystal had higher hardness than monolithic MoSi 2. The room-temperature flexural strength increased 60% compared to that of pure MoSi 2. Especially the room-temperature fracture toughness of the composites was higher than that of MoSi 2, from 3.6 MPa m 1/2 for MoSi 2 to 5.1 MPa m 1/2 for composites with 20 vol.% Si 3N 4, respectively. Besides, the yield strength at elevated temperature and the low-temperature oxidation resistance for 20 vol.% Si 3N 4–MoSi 2 composite exhibited considerable improvement over that of monolithic MoSi 2. These results showed that Si 3N 4 rodlike crystal is an effective reinforcement for MoSi 2.
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