碳/碳复合材料SiC/MoSi_2/ZrO_2涂层体系氧化烧蚀性能

抗氧化涂层技术是解决碳/碳复合材料高温抗氧化性的最有效技术途径之一。为了提高材料在1 800℃以上的高温抗氧化性能,首次采用包埋法、涂刷法和等离子喷涂法在碳/碳复合材料表面制备出SiC/MoSi_2/ZrO_2梯度抗氧化涂层体系。采用SEM/EDS、结合力和粗糙度测试对涂层表面及断面形貌进行微观分析,利用等离子风洞对整个涂层体系进行氧化试验。结果表明:基体、过渡层和高温抗氧化层之间结合力良好,高温抗氧化层厚度均匀、结构致密。经等离子风洞氧化600s后,涂层表面温度达到1 850℃,氧化质量失重速率仅为3.15×10~(-6) g/(cm~2·s)。表明SiC/MOSi_2/ZrO_2梯度抗氧化涂层体系在1 800℃以上的高温环境下具有很好的抗氧化性能。

Oxidation ablation property of carbon/carbon composites SiC/MoSi2/ZrO2 coating system

Anti oxidation coating technology is one of the most effective ways to solve the high temperature oxida-tion resistance of carbon/carbon composites.In order to improve the high temperature oxidation resistance of materi-als above 1 800 ℃,a SiC/MoSi2/ZrO2 gradient oxidation resistant coating system was fabricated on surface of the carbon/carbon composites by the pack cementation method,slurry method and plasma spraying process.The sur-face and section morphologies of coating were observed by XRD/EDS,intensity and roughness testing.The total coating system is tested by plasma wind tunnel.Results show that the coating has a compact interfacial bonding strength among matrix,transition layer and high temperature oxidation resistance layer.High temperature oxidation resistance layer has uniform thickness and dense structure.After 600 s plasma wind tunnel oxidation,surface tem-perature of coating reaches up to 1 850 ℃.The oxidation mass loss rate is 3.15×10-6 g/(cm2 ·s).The SiC/Mo-Si2/ZrO2 gradient oxidation resistant coating system has good antioxidant capacity over 1 800 ℃.