摘要
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。
The boat coating of HY5prepared by arc ion plating was deposited on DD32alloy substrate.The surfacewere treated by vibratory polished(VS)and grit-blasted,and then YSZ was deposited on the bond coating by EB-PVD.Themicrostructures of the bond coating by different surface treatments were investigated.The oxidation resistance of TBCswas measured and compared.Furthermore,effects of surface on interface elementary composition and failure characteristicwere studied.The results indicate that both surface treatments can improve the bond coating surface and lead to betteroxidation resistance.Compared with TBCs treated by vibratory polished(VS)and grit-blasted,the scale morphology wasuniformon flat surfaces.After high temperature oxidation,wrinkling appeared on TGO with rough interface.
作者
杨文慧
牟仁德
YANG Wenhui;MU Rende(Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material,AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China)
出处
《航空制造技术》
2017年第8期44-49,共6页
Aeronautical Manufacturing Technology
基金
国家863计划(2015AA034403)
关键词
热障涂层
粗糙度
高温氧化
界面微观结构
Thermal barrier coating
Roughness
High temperature oxidation
Interface morphology
