SiC coating toughened by HfC nanowires to protect C/C composites against oxidation
SiC coating toughened by HfC nanowires to protect C/C composites against oxidation
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HfC 纳米线增韧的 SiC 涂层可保护 C/C 复合材料免受氧化
DOI：
10.1016/j.apsusc.2014.05.042
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发表时间：
2014-08
影响因子：
6.7
通讯作者：
Zhixiong Hu
中科院分区：
文献类型：
--
作者：
Jincui Ren;Song Tian;Hejun Li;Zhixiong Hu
为了防止碳/碳（C/C）复合材料在高温下氧化，采用化学气相沉积（CVD）和填充胶结两步技术制备了HfC纳米线增韧的致密SiC涂层。研究了涂层的显微组织、力学性能和抗氧化性能。HfC纳米线可以有效地减小微裂纹的尺寸，避免在SiC涂层中形成贯穿厚度的微裂纹。由于纳米线的微裂纹桥接和纳米线的拉拔等增韧机制，涂层的力学性能和抗氧化性能得到了改善。
To prevent carbon/carbon (C/C) composites from oxidation at high temperature, a dense SiC coating toughened by HfC nanowires was prepared by a two-step technique of chemical vapor deposition (CVD) and pack cementation. The microstructure, mechanical properties and oxidation resistance of the coating were investigated. The HfC nanowires can effectively reduce the size of microcracks and avoid the formation of through-thickness microcracks in the SiC coating. Due to the toughening mechanisms including microcrack bridging by nanowire and nanowire pullout, the mechanical properties and oxidation resistance of the coating are improved.
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