(C/C Composites Research Center, Northwestern Polytechnical University, Xi’an 710072, China)
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Abstract:
Oxidation and ablation of carbon/carbon (C/C) composites in oxidationcontaining environments limits their applications as the hightemperature structural materials in aeronautics and aerospace fields. Matrix modification is an effective method for protecting C/C composites against oxidation and ablation at high temperature. The methods for matrix modification, including chemical vapor infiltration, precursor infiltration pyrolysis, reaetive melt infiltration and chemical vapor reaction, were introduced. The research status of several modification materials, including SiC, ZrC, TaC, HfC, ZrB2, WC and Cu, were reviewed. Refractory carbides or borides, such as HfC, ZrC, TaC, HfB 2 and ZrB 2, characterized by high melting point, excellent stability and ablation resistance at high temperature, are the perfect candidates for modifying C/C composites. The present problems and the potential development direction on the investigation of matrix modification for C/C composites were also proposed.