Toughening by SiC nanowires in a dense SiC - Si ceramic coating for oxidation protection of C / C composites

Yanhui Chu, Hejun Li, Qiangang Fu, Lehua Qi, Xu Zou

科研成果: 期刊稿件文章同行评审

38 引用 (Scopus)

摘要

A dense oxidation protective SiC-Si ceramic coating with well-dispersion SiC nanowires was prepared on carbon/carbon (C/C) composites using a two-step technique consisting of chemical vapor deposition and hot-pressing reactive sintering. The results showed that the toughness and thermal shock resistance of the coating were dramatically improved, resulting in an excellent oxidation protection for the coated C/C composites, which is attributed primarily to the toughening effects of SiC nanowires in the coating including two special energy dissipation mechanisms involving the super-plasticity deformation of SiC nanowires and the plastic fracture at the interface of the nanowire-matrix, except for nanowire pullout, nanowire bridging, and microcrack deflection. More importantly, a novel oxidation protective failure mechanism of the coated C/C composites revealed that the presence of Al 3+ in the coating, damaged the network structure of SiO 2 glass and resulted in the slight oxidation of C/C composites.

源语言英语
页(从-至)3691-3697
页数7
期刊Journal of the American Ceramic Society
95
11
DOI
出版状态已出版 - 11月 2012

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