Yttrium silicate oxidation protective coating for SiC coated carbon/carbon composites
Yttrium silicate oxidation protective coating for SiC coated carbon/carbon composites
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DOI：
10.1016/j.ceramint.2005.03.018
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发表时间：
2006
影响因子：
5.2
通讯作者：
Jianfeng Huang;Hejun Li;Xierong Zeng;Kezhi Li
中科院分区：
文献类型：
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作者：
Jianfeng Huang;Hejun Li;Xierong Zeng;Kezhi Li
采用等离子喷涂技术在碳/碳复合材料表面制备了SiO2·Y2 O3、1.5SiO2·Y2 O3、1.5SiO2·Y2 O3/SiO2·Y2 O3和2SiO 2·Y2 O3/1.5SiO2·Y2 O3/SiO2·Y2 O3四种硅酸钇防氧化涂层。采用XRD、SEM和EDS等分析手段对涂层的结构进行了表征。结果表明：2SiO 2·Y2 O3/1.5SiO2·Y2 O3/SiO2·Y2 O3梯度多层涂层具有较好的抗高温氧化性能。在1773 K的空气中，该复合材料在73 h内的氧化失重小于2%。涂层炭/炭复合材料的氧化活化能为87.3kJ/mol，多层涂层炭/炭复合材料的氧化过程受涂层孔隙中氧扩散速率的控制。
Four kinds of yttrium silicate oxidation protective coatings SiO2·Y2O3, 1.5SiO2·Y2O3, 1.5SiO2·Y2O3/SiO2·Y2O3and 2SiO2·Y2O3/1.5SiO2·Y2O3/SiO2·Y2O3were prepared by plasma spray on the surface of SiC pre-coated carbon/carbon composites. The structures of the coatings were characterized by XRD, SEM and EDS analyses. It was shown that the gradied 2SiO2·Y2O3/1.5SiO2·Y2O3/SiO2·Y2O3multi-layer coating had better high-temperature oxidation resistance. It could protect carbon/carbon composites from oxidation at 1773K in air for 73h with a weight loss of less than 2%. The oxidation activation energy of the coated carbon/carbon composites is 87.3kJ/mol, and the oxidation process in C/C substrates with a multi-layer coating was controlled by the rate of oxygen diffusion through the holes in the coating.