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分别采用环氧树脂和呋喃树脂作为基体混合碳化硅粉末与晶须制备了耐高温修复涂料。以氧—乙炔烧蚀试验测试涂料的耐高温烧蚀性能,用扫描电子显微镜分析烧蚀后涂料表面的微观形貌,用X射线衍射、表面能谱分析对涂料烧蚀后成分进行分析表征。结果表明:碳化硅粉末与晶须的质量分数比为8/4的呋喃树脂/碳化硅体系涂料具有良好的耐高温烧蚀性能,线烧蚀率与质量烧蚀率分别为28μm/s和66 mg/s。烧蚀过程中生成的SiO2能在烧蚀表面形成致密的连续层,阻止氧-乙炔焰对试样下层基体的烧蚀,起到保护下层基体的作用。呋喃树脂/碳化硅体系修复涂料可用于TPS破损结构的修复。
Epoxy resin and furan resin were used as the matrix mixed SiC powder and whisker to prepare a high temperature resistant coating. The ablation performance of the coating was tested by oxy-acetylene ablation test. The microstructure of the ablated coating surface was analyzed by scanning electron microscopy. The ablated composition of the coating was characterized by X-ray diffraction and surface energy spectrum analysis. The results show that furan resin / silicon carbide coating with silicon carbide powder and whisker mass fraction ratio of 8/4 has good high temperature ablation performance, the ablation rate and mass ablation rate are 28μm / s and 66 mg / s. SiO2 generated during the ablation process can form a dense and continuous layer on the ablated surface, preventing the ablation of the oxygen-acetylene flame on the underlying substrate and protecting the underlying substrate. Furan resin / silicon carbide system repair coating can be used to repair TPS damaged structures.