Toughening by SiC Nanowires in a Dense SiC–Si Ceramic Coating for Oxidation Protection of C/C Composites
摘要：
A dense oxidation protective SiC–Si ceramic coating with wellヾispersion SiC nanowires was prepared on carbon/carbon (C/C) composites using a two﹕tep technique consisting of chemical vapor deposition and hot﹑ressing 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﹑lasticity deformation of SiC nanowires and the plastic fracture at the interface of the nanowire﹎atrix, 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 Al3+ in the coating, damaged the network structure of SiO2 glass and resulted in the slight oxidation of C/C composites.
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DOI：
10.1111/j.1551-2916.2012.05412.x
被引量：
年份：
2012
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