Oxidation behavior of oxidation protective coatings for PIP–C/SiC composites at 1500 °C
Oxidation behavior of oxidation protective coatings for PIP–C/SiC composites at 1500 °C
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DOI：
10.1016/j.ceramint.2011.06.063
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发表时间：
2012
影响因子：
5.2
通讯作者：
Y. Xiang;Wei Li;Song Wang;Zhaohui Chen
中科院分区：
文献类型：
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作者：
Y. Xiang;Wei Li;Song Wang;Zhaohui Chen
以聚碳硅烷为基体先驱体，采用先驱体浸渗热解法（PIP）制备了三维碳纤维增强碳化硅（C/SiC）复合材料，并分别在C/SiC复合材料上涂覆了化学气相沉积（CVD）法制备的SiC涂层和CVD法结合浆涂法制备的ZrB 2-SiC/SiC涂层。比较了3种试样在1500°C下的氧化行为，并研究了它们的显微组织和力学性能。结果表明，未涂层的C/SiC复合材料变形较快。SiC涂层试样在2 h氧化后的质量损失为4.6%，而ZrB_2-SiC/SiC多层涂层试样氧化后的质量损失仅为0.4%。ZrB 2-SiC/SiC多层涂层可对C/SiC复合材料提供长期保护。C/SiC复合材料的断裂模式也发生了变化。涂层后，C/SiC复合材料的断裂方式为脆性断裂。氧化后，无涂层和有涂层的C/SiC复合材料的断裂方式也都是脆性断裂。
Three-dimensional carbon fiber reinforced silicon carbide (C/SiC) composites were fabricated by precursor infiltration and pyrolysis (PIP) with polycarbosilane as the matrix precursor, SiC coating prepared by chemical vapor deposition (CVD) and ZrB2–SiC/SiC coating prepared by CVD with slurry painting were applied on C/SiC composites, respectively. The oxidation of three samples at 1500°C was compared and their microstructures and mechanical properties were investigated. The results show that the C/SiC without coating is distorted quickly. The mass loss of SiC coating coated sample is 4.6% after 2h oxidation and the sample with ZrB2–SiC/SiC multilayer coating only has 0.4% mass loss even after oxidation. ZrB2–SiC/SiC multilayer coating can provide longtime protection for C/SiC composites. The mode of the fracture behavior of C/SiC composites was also changed. When with coating, the fracture mode of C/SiC composites became brittle. When after oxidation, the fracture mode of C/SiC composites without and with coating also became brittle.