High-temperature mechanical behavior of carbon–silicide–carbide composites developed by alloyed melt infiltration

In order to improve high-temperature mechanical properties of silicon-infiltrated SiC materials infiltration with a Si–Ti–MoSi2 alloyed melt and reinforcement with carbon fibers were investigated. Microstructure, bending strength, and creep resistance of alloy-infiltrated samples with and without reinforcement were studied and compared with silicon-infiltrated samples. The composites reinforced with high-modulus carbon fibers had generally higher bending strengths and lower creep deformations than infiltrated felts. The alloy-infiltrated felts showed more resistance against creep deformation than silicon-infiltrated felts and had higher strengths both at room and at high temperature. Alloy-infiltrated and silicon-infiltrated reinforced composites behaved almost the same at low and high temperatures.