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采用电子束物理气相沉积技术在高温合金基体上制备不同粘结层厚度的YSZ热障涂层试样来分析粘结层厚度对热障涂层体系寿命的影响。对试样进行循环氧化试验以及热重分析来测试试样的热循环寿命和抗氧化性能。分别采用XRD、SEM和EDS对不同状态下的涂层进行相组成、微观形貌和成分组成分析。结果显示:热障涂层体系有明显的抗氧化作用,且抗氧化作用随着粘结层厚度的增加逐渐增强;粘结层的厚度对涂层体系的寿命影响显著,在特定的厚度范围内,涂层体系热循环寿命较长。综合各方面影响因素,得出本试验条件下粘结层厚度最优范围为50～70μm。
The electron beam physical vapor deposition technique was used to fabricate YSZ thermal barrier coatings with different bond thickness on the superalloy substrate to analyze the effect of the bond layer thickness on the thermal barrier coating system life. The sample was subjected to cyclic oxidation test and thermogravimetric analysis to test the thermal cycle life and oxidation resistance of the sample. XRD, SEM and EDS were used to analyze the phase composition, microstructure and composition of coatings under different states. The results show that the thermal barrier coating system has obvious anti-oxidation effect, and the anti-oxidation function increases with the increase of the thickness of the adhesive layer. The thickness of the adhesive layer has a significant effect on the life of the coating system. Within the specified thickness range , Coating system thermal cycle longer life expectancy. Based on the influencing factors of all aspects, the optimal thickness of the adhesive layer under this test condition is 50 ~ 70μm.