ZrB2-SiC/（C/C）复合涂层材料微观结构与静态氧化特性

Microstructure and static oxidation performance of ZrB2-SiC/（C/C）composite coating

采用涂刷法在C/C复合材料表面制备了ZrB2-SiC复合涂层,采用XRD和SEM分析了涂层的相组成和微观结构,并研究了ZrB2-SiC/(C/C)复合涂层材料在1 200℃和1 500℃的静态氧化性能。结果表明:ZrB2-SiC涂层结构致密,无明显的孔洞和裂纹;涂层有效改善了材料的抗氧化性能,经1 200℃静态氧化60min后,ZrB2-SiC/(C/C)复合涂层材料失重率仅为2.4%,1 500℃时失重率增大至15%,小于无涂层保护的C/C复合材料(~35%)。ZrB2-SiC/(C/C)复合涂层材料氧化后,形成了含有ZrO2等高熔点颗粒的玻璃态SiO2氧化膜,能够有效抑制氧的扩散,从而提高了C/C复合材料抗氧化性能。

The ZrB2-SiC composite coatings were prepared on C/C composites by slurry painting.The phase composition and microstructure of the as-prepared ZrB2-SiC/(C/C)composites were analyzed by XRD spectroscopy and SEM,and the static oxidation behavior at 1 200℃and 1 500℃were also investigated.The results show that the ZrB2-SiC coatings are compact and uniform without obvious pores and cracks.After static oxidizing at 1 200℃for60min,the mass loss rate of the as-prepared ZrB2-SiC/(C/C)composites is only about 2.4%.At 1 500℃,the mass loss rate increases to about 15%,but it is still lower than that of C/C composites without anti-oxidation coatings(~35%).In the static oxidation process,the significantly improved oxidation resistance of the as-prepared ZrB2-SiC/(C/C)composites is attributed to the generated glassy SiO2film containing high melting point particles such as ZrO2.