A dense and uniform c-AlPO₄ and SiC whisker co-modified mullite coating was successfully prepared on SiC-coated C/SiC composites with a thickness of about 70 μm by hydrothermal electrophoretic deposition. The thermal cycling performance of the coating samples was evaluated by thermally cycling between 1773 K and room temperature in a corundum tube furnace. Results show that the addition of SiC whisker (SiC_w-mullite coating) significantly improved the thermal cycling resistance of single mullite outer layer on account of the toughening mechanism of SiC whiskers, such as whisker bridging and crack deflection. Then, the addition of c-AlPO₄ (c-AlPO₄-SiC_w-mullite coating, termed ASM coating) further improved the thermal cycling resistance on account of the healing and bonding performances of c-AlPO₄ at high temperature. After 40 thermal cycles, the weight loss of ASM coating on SiC-coated C/SiC composites was 4.5% compared to 5.24% for the SiC_w-mullite coating. The retention rate of compressive strength of ASM coating on SiC-coated C/SiC matrix was 80.66% compared to 73.65% for the SiC_w-mullite coating.

通过水热电泳沉积，成功地在厚度约70μm的SiC涂层C / SiC复合材料上制备了致密且均匀的c -AlPO ₄和SiC晶须共改性莫来石涂层。通过在刚玉管式炉中在1773 K和室温之间进行热循环来评估涂层样品的热循环性能。结果表明，由于SiC晶须的增韧机理（如晶须桥接和裂纹偏斜），添加SiC晶须（SiC _w-莫来石涂层）显着提高了单莫来石外层的抗热循环性能。然后，添加c -AlPO ₄（c -AlPO ₄ -SiC_w-莫来石涂层，称为ASM涂层）由于c -AlPO ₄在高温下的愈合和粘结性能而进一步改善了耐热循环性。在40次热循环后，ASM涂层在SiC涂层C / SiC复合材料上的重量损失为4.5％，而SiC _w-莫来石涂层为5.24％。ASM涂层在SiC涂层的C / SiC基质上的压缩强度保留率是80.66％，而SiC _w-莫来石涂层的保留率为73.65％。