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采用真空电弧离子镀技术在单晶高温合金DD32上制备HY5金属粘结层,通过振动光饰、吹砂2种不同的表面处理方法改变粘结层表面状态,再在粘结层表面利用电子束物理气相沉积技术制备陶瓷层。研究了不同处理方法对粘结层表面状态的影响;测试了不同表面处理方法下制备的热障涂层的高温氧化性能并对比分析了它们的变化规律。此外,探讨了不同表面处理方法对界面元素成分及失效特征的影响。研究结果表明,通过表面处理可以去除粘结层表面较大的凸起,提高表面平整度,提高热障涂层抗氧化性能。与粗糙界面相比,光滑界面形成的TGO层均匀致密,Al含量高。经长时间的高温氧化后,粗糙界面的TGO层出现明显皱曲现象,陶瓷层开裂剥落。
HY5 metal bonding layer was prepared on the single crystal superalloy DD32 by vacuum arc ion plating. Two different surface treatment methods were used to change the surface state of the bonding layer, such as vibrating light decoration and sand blowing. Then the electron beam Physical vapor deposition techniques for preparing ceramic layers. The effects of different treatment methods on the surface state of the adhesive layer were studied. The high temperature oxidation properties of the thermal barrier coatings prepared by different surface treatments were tested and their variation regularities were compared. In addition, the effects of different surface treatment methods on the composition and failure characteristics of interface elements were discussed. The results show that the surface of the adhesive layer can be removed by the surface of the larger bumps to improve the surface roughness and improve the thermal barrier coating oxidation resistance. Compared with the rough interface, the TGO layer formed by the smooth interface is uniform and dense with high Al content. After prolonged oxidation at high temperature, the TGO layer of the rough interface appears obvious wrinkling, and the ceramic layer cracks and spalls.