【摘要】 通过SiCf/SiC复合材料表面等离子喷涂（APS）硅黏结层和莫来石中间层,等离子–物理气相沉积（PS–PVD）制备硅酸镱面层,喷涂的整个环境障涂层体系组织致密,PS–PVD工艺制备的硅酸镱为层状结构,孔隙率<1%。研究了SiCf/SiC复合材料环境障涂层的抗静态氧化、循环氧化、水汽腐蚀和热冲击性能,发现复合材料表面的环境障涂层体系在1200℃、1300℃下静态氧化和循环氧化100h后皆保持表面完好,无剥落现象,具有较好的抗氧化性能。涂层在1300℃燃气热冲击试验寿命超过100次循环,且在1200℃、15%H₂O水汽环境中静态氧化100h以内的耐腐蚀性能良好。更多还原

【Abstract】 An environmental barrier coating system was applied on SiCf/SiC composite specimens with the silicon bond coat and mullite intermediate coat sprayed using APS processes and the ytterbium silicate topcoat sprayed using a PS–PVD process. The sprayed environmental barrier coating system is dense in microstructure and the PS–PVD ytterbium silicate topcoat possesses lamellar structure with a porosity less than 1%. The static oxidation, cyclic oxidation, water vapour corrosion and thermal impact resistances of the environmental barrier coating system were investigated. It was demonstrated that the environmental barrier coating sprayed on the SiCf/SiC composite specimens had a desirable oxidation resistance as it kept intact with no obvious evidence of spallation observed after 100 h static oxidation, 100 h cyclic oxidation test at 1200℃ and 1300℃. Moreover, the coating had a thermal impact resistance life more than 100 cycles as heated to a high temperature of 1300℃ by a hot gas stream and it had a preferable corrosion resistance at 1200℃ in an environment containing 15% H₂O water vapour.更多还原