High-Temperature Resistant Composites in the AlN?SiC?MoSi2 System?, J. Am. Ceram. Soc.

Two fully dense composites containing AlN, SiC and MoSi2 in different amounts were produced by hot pressing. The main phase is AlN, SiC content is 15 and 20 vol % and MoSi2 content is 20 and 30 vol % in the two composites, respectively. Young modulus, hardness, electrical conductivity and thermal expansion coefficient were measured at room temperature. Strength and toughness were evaluated up to 1300°C in air. From statistical analysis, the temperature has little or no effect on high-temperature fracture behavior of the composites. These electroconductive materials are suitable for thermo-mechanical applications at high temperature, being the strength at 1300°C about 600 MPa.