Cyclic oxidation study of MoSi2–Si3N4 base composites

A series of MoSi2–Si3N4 base composites was evaluated for potential Navy gas turbine engine applications. The composites underwent cyclic oxidation testing to determine their oxidation and thermal shock resistance. Specimens were exposed to 900°C for 55 min followed by a 5 min air-cool. After 500 cycles, the specimens were examined for phase transformations, weight and elemental changes, and thermal shock resistance.