TiAl合金表面热障涂层的组织结构及其高温磨损性能研究  

Microstructure and High Temperature Wear of the Thermal Barrier Coatings on TiAl Alloys

作　　者：吴向清[1] 周阿林[1] 谢发勤[1] 胡宗纯[1] 

机构地区：[1]西北工业大学航空学院,陕西西安710072

出　　处：《摩擦学学报》2011年第4期357-361,共5页Tribology

基　　金：国家重点基础研究发展规划项目(973)(2007CB607603);陕西省科技项目(2006KG03)资助~~

摘　　要：利用EB-PVD技术在TiA l合金表面制备了扩散铝/YSZ热障涂层.采用SEM、EDS和XRD分析了涂层的微观组织及其相组成,并测试了显微硬度和耐磨性.结果表明:涂层表面YSZ层为致密柱状晶结构,由非平衡四方相t'-ZrO2组成;涂层结构由表及里依次为YSZ/A l2O3/TiA l3/TiA l2/TiA l;涂层的显微硬度和高温磨损性能显著提高,其高温磨损机理为轻微的犁削和严重的粘附转移,体积磨损率约为TiA l合金磨损率的1/10.Al-diffusion/YSZ thermal barrier coatings（TBCs） were deposited on the TiAl alloy by electronic beam-physical vapor deposition（EB-PVD）.The microstructure,chemical composition and phase constituent of the TBCs were analyzed by SEM,EDX and XRD.The microhardness and high temperature friction and wear behavior of the TBCs were measured.The results showed that the top YSZ coatings were composed of non-equilibrium tetragonal ZrO2,which had a dense columnar microstructure.The phase constituent of the cross-sectioned TBCs was YSZ/Al2O3/TiAl3/TiAl2/TiAl from top to inner.The microhardness and high temperature wear resistance of TBCs were much higher than that of the substrate.The wear mechanisms of the Al-diffusion/YSZ are mild ploughing and severe adhesion at elevated temperature.The wear rate of TBCs was about 1/10 of the bare TiAl alloys.

关 键 词：TIAL合金 EB-PVD 热障涂层 摩擦磨损 

分 类 号：TG146.23[一般工业技术—材料科学与工程]