Mechanical response and microstructure of 2D carbon fiber reinforced ceramic matrix composites with SiC and Ti3SiC2 fillers
Mechanical response and microstructure of 2D carbon fiber reinforced ceramic matrix composites with SiC and Ti3SiC2 fillers
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DOI：
10.1016/j.ceramint.2015.10.088
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发表时间：
2016-02
影响因子：
5.2
通讯作者：
Jinshan Yang;S. Dong;Chengying Xu
中科院分区：
文献类型：
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作者：
Jinshan Yang;S. Dong;Chengying Xu
采用SiC和Ti3SiC2作为单独填料，通过PIP工艺制备二维碳纤维增强陶瓷基复合材料。研究了SiC和Ti3SiC2填料对最终复合材料机械性能、断裂行为和微观结构的影响。力-位移曲线显示，与 Cf/SiC 复合材料相比，Cf/Ti3SiC2-SiC 复合材料在三点弯曲试验中没有明显分层，而 Cf/SiC 复合材料的全厚度裂纹更加隐蔽。 Cf/Ti3SiC2-SiC复合材料的极限力远低于Cf/SiC复合材料。碳纤维与基体之间的热膨胀失配和化学反应使得Cf/Ti3SiC2-SiC复合材料中纤维-基体界面结合更强。由此可见，碳纤维的强度会因化学反应而受损。热膨胀失配和化学反应是影响最终复合材料机械性能和微观结构的两个重要因素。
2D carbon fiber reinforced ceramic matrix composites are prepared by PIP process using SiC and Ti3SiC2as separate fillers. The effect of SiC and Ti3SiC2fillers on mechanical property, fracture behavior and microstructure of the final composites is studied. The force–displacement curve shows no apparent delamination in Cf/Ti3SiC2–SiC composites during three-point flexural test, compared to Cf/SiC composites in which the through-thickness crack is much more devious. The ultimate force of Cf/Ti3SiC2–SiC composites is much lower than Cf/SiC composites. The thermal expansion mismatch and chemical reactions between carbon fiber and the matrix make the fiber–matrix interface bonding stronger in Cf/Ti3SiC2–SiC composites. It can infer that the carbon fibers׳ strength can be damaged by the chemical reactions. The thermal expansion mismatch and chemical reactions are two important factors that influence the mechanical properties and microstructure of the final composites.