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以声化学法合成的纳米硅酸钇粉体为原料,异丙醇为溶剂,碘为荷电介质,采用水热电泳沉积方法在SiC-C/C复合材料表面制备出硅酸钇涂层,借助XRD和SEM对涂层的晶相组成、表面和断面的微结构形貌进行了表征,重点研究了水热电泳沉积温度对涂层结构及抗氧化性能的影响.结果表明,涂层中以Y2Si2O7为主晶相,涂层的厚度和致密性随着水热温度的增加而提高;与包埋法制备的SiC涂层相比,水热电泳沉积制备的硅酸钇复相涂层具有更好的抗氧化性能,涂层试样在1 500 ℃的空气气氛下氧化35 h后失重为0 .32×10-3g/cm3.
The yttrium silicate coating was prepared on the surface of SiC-C / C composites by hydrothermal electrophoretic deposition method by using yttrium silicate powders synthesized by sonochemical method as raw materials, isopropyl alcohol as solvent and iodine as the charging medium. XRD and SEM were used to characterize the microstructure, surface morphology and microstructure of the coating. The effects of deposition temperature on the structure and oxidation resistance of the coating were investigated emphatically. The results show that the coating is composed of Y2Si2O7 As the main crystalline phase, the thickness and compactness of the coating increase with the increase of hydrothermal temperature. Compared with the SiC coating prepared by embedding method, the yttrium silicate coating prepared by hydrothermal electrophoretic deposition is better Of the anti-oxidation properties, the coating sample in the air atmosphere at 1500 ℃ for 35 h after the loss of weight loss of 0.32 × 10-3g / cm3.