| 초록 |
Carbon fiber reinforced carbon matrix composites (C/C composites) has been widely used in many fields due to their excellent mechanical properties, chemical stability and thermal stability.Phenolic resin is a versatile group of materials that meet extended requirements both in properties and processing. They are commonly used as starting materials, in the resin-based process, C/C composites preparation by a procedure employing pyrolysis and carbonization of resin matrix and subsequent densification. Since they are easy to handle and give considerable carbon char yield.In their real applications, the study on oxidation reaction inhibition for the prediction of C/C composite working life in oxidizing environments is one of the primary concerns for the prediction of composite behaviors along with the study of thermal and mechanical properties of C/C composites. 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.The objective of the present work is to provide understanding of the effects of the ceramic powders on the oxidation reaction inhibition and thermo-mechanical properties. Differential scanning calorimeter (DSC), thermo-gravimetric analysis (TGA), scanning electron microscopy (SEM), porosity and density changes of the C/C composites without and with ceramic powders will be discussed.
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