热处理对超音速火焰喷涂NiCoCrAlY涂层组织性能的影响  

Effects of heat treatment on microstructure and properties of NiCoCrAlY coating with HVOF spraying

作　　者：田晔 郭素丽 杨晓剑 TIAN Ye;GUO Suli;YANG Xiaojian(BGRIMM Technology Group,Beijing 100160;JINHUAN Construction Group Co.,LTD.Beijing 100160)

机构地区：[1]北京矿冶科技集团有限公司,北京100160 [2]金环建设集团有限公司,北京100160

出　　处：《热喷涂技术》2018年第3期19-22,共4页Thermal Spray Technology

基　　金：国家自然科学基金(51704025)

摘　　要：采用超音速火焰喷涂制备了NiCoCrAlY合金涂层,采用真空热处理工艺对涂层进行了后处理,研究了热处理前后涂层的结构形貌、界面以及涂层结合强度的变化。研究结果表明:热处理后涂层的缺陷和孔隙由8.3%降低至1.4%;SEM和EDS分析表明,涂层与基材之间发生了元素互扩散,涂层与基体形成了约20μm的扩散层,涂层的结合强度由42.1MPa提高到55.6MPa。热处理后,涂层/基体界面形成的扩散层改善了界面结合状态,有助于消除界面处的残余应力,并形成冶金结合,从而提高涂层的结合强度。NiCoCrAlY alloy coating was prepared by HVOF spraying. The coating was treated by vacuum heat treatment process. The structure, interface and bonding strength of the coating before and after heat treatment were studied. The results show that the defects and porosity rate of the coating are reduced from 8.3% to 1.4% after heat treatment. The analysis of SEM and EDS shows that the interdiffusion between the coating and the substrate has occurred. The coating and the substrate formed about 20μm diffusion layer, and the bonding strength of the coating increased from 42.1MPa to 55.6MPa. After heat treatment, the diffusion layer formed by the coating / substrate interface improves the interfacial bonding state, helps to eliminate the residual stress at the interface, and forms a metallurgical bonding, thus improving the bonding strength of the coating.

关 键 词：热处理 超音速火焰喷涂 MCRALY 界面 结合强度 

分 类 号：TG174.4[金属学及工艺—金属表面处理]