Abstract

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Title:: Self Healing Oxidation Resistance of C/C Composite Covering a Broader Temperatures Range

Author(s):: ZHANG Weigang; (State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China)

Abstract:: Mechanism of selfhealing oxidation resistance and preparation technique of a kind of carbon fiber reinforced pyrolytic carbon composite (C/C) are suggested in the study. The composite characterized with homogeneous nanodispersed complex matrix of ZrB2ZrCSiC was prepared by polymer impregnanting and pyrolysis (PIP) process, ie the nanodispersed ZrB2ZrCSiC composite ceramics were introduced into a porous C/C composites with low density using complex precursors prepared by completely dissolving of ZrB2, ZrC polymeric precursors and polycarbosilanes in dimethylbenzene solution. Ultrahigh temperature ablation tests shown that the linear and mass ablation rate at 2 200 ℃ for the C/CZrB2ZrCSiC composites decreased by 858% and 710%, respectively, in comparison with those of C/CSiC composites. The very low ablation rates result from the formation of uniformly distributed ZrO2SiO2 continuous glass coating, which prevented the molecular innerdiffusion of oxygen and thereby protected the carbon phase from being further oxidized.