采用水热电泳沉积法在SiC-C/C复合材料表面制备方石英型磷酸铝和莫来石的复相（C-AlPO4-莫来石）抗氧化涂层。借助X射线衍射、扫描电子显微镜和等温静态氧化实验对复合涂层的晶相组成、显微结构和抗氧化性能进行了表征与测试。研究了水热温度对C-AlPO4-莫来石涂层显微结构的影响,分析了复合涂层在1773K下的氧化行为。结果表明：353~413K范围内,当水热温度为393K时制备的涂层致密均匀。C-AlPO4-莫来石复合涂层具有较好的抗氧化性能,在1773K氧化348h后失重率仅为1.45%,氧化失重速率稳定在0.33mg/cm2·h的极低水平。复合涂层在1773K下的氧化能力下降主要是由于长时间氧化后偏磷酸盐和硅酸盐玻璃层不能及时有效的填补涂层中的缺陷,涂层试样在高温下产生了较多贯穿性孔洞。
A C-A1PO4-mullite anti-oxidation coating was prepared on SiC pre-coated C/C composites by novel hydrotbermal electrophoretic deposition. The phase compositions, microstructures and anti-oxidation properties of the as-prepared multi-coatings were characterized by XRD, SEM and isothermal oxidation test. The influence of hydrothermal temperature on the microstructure was investigated. Results show that the dense and homoge- neous of the C A1PO4-mullite coating was achieved when the hydrothermal temperature reaches 393K. The as- prepared coatings exhibit excellent anti-oxidation property, which could effectively protect C/C composites from oxidation at 1773K in air for 348h with a weight loss of 1. 45%, the corresponding weight loss rate is only 0.33mg/(cm2·h). The anti-oxidation capability decrease of the coating at 1773K is due to the generation of cross-holes in the coating, which can not be self-cured by the metaphosphate and silicate glass layer after long time of oxidation.
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