Ultimate objective of this research is to develop polymer composite materials having high mechanical performance at high application temperatures. The study on oxidation reaction inhibition for the prediction of C/C composites working life in oxidizing environments is one of the primary concerns for the prediction of composite behaviors, together with a study of thermal and mechanical properties. On the other hand, silicides like MoSi₂ may be more suitable for this application, as these materials have high melting point (>2300K) and excellent oxidation resistance. In addition these materials becomes ductile above its brittle-to-ductile transition (BDT) temperature of 900℃, leading to the high mechanical performance at high application temperatures. In their real applications, this is to provide understanding the effects of oxidation inhibitors on the oxidation reaction and thermal resistance properties at high temperatures.