表面喷丸处理对NiCrAlYSi涂层恒温氧化行为的影响  

The Influence of Surface Shot Peening on the Isothermal Oxidation Behavior of NiCrAlYSi Coating

作　　者：刘冠熙 黄光宏 罗学昆 申造宇 何利民 李建平 牟仁德 LIU Guanxi;HUANG Guanghong;LUO Xuekun;SHEN Zaoyu;HE Limin;LI Jianping;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)

机构地区：[1]中国航发北京航空材料研究院航空材料先进腐蚀与防护重点实验室,北京100095

出　　处：《金属学报》2021年第5期684-692,共9页Acta Metallurgica Sinica

基　　金：中国科协第五届青年人才托举工程项目No.2019-2021QNRC001。

摘　　要：采用真空电弧离子镀工艺制备了NiCrAlYSi涂层,研究了NiCrAlYSi涂层表面喷丸处理对其恒温氧化行为的影响。结果表明,喷丸处理工艺可降低涂层表面粗糙度,提高涂层表面致密性和平整性。在恒温氧化过程中,经过喷丸处理后的涂层能减少O原子向内扩散从而避免异常氧化区的出现,同时形成的热生长氧化(TGO)层厚度更加均匀,通过0.4 MPa、5 min喷丸处理后,NiCrAlYSi涂层TGO层厚度生长速率较未喷丸处理涂层降低60%,抗氧化性能得到提高。Thermal barrier coatings(TBCs), which mainly comprise top and bond coats, have been applied to the hot components of gas turbine engines owing to their low thermal conductivity, hightemperature oxidation resistance, gas corrosion resistance, and so on. However, a thermally grown oxide(TGO) layer, which germinates between top and bond coats, has a considerable effect on the service life of TBCs. Moreover, the microstructure optimization and growth inhibition of a TGO layer are crucial. The surface modification of bond coat in TBCs has been introduced to reduce and optimize the growth rate of a TGO layer. Among these methods, the surface shot peening of bond coat has yet to be extensively elucidated at high service temperatures. Furthermore, the influence of surface shot peening on isothermal oxidation behavior has rarely been reported in literature. In the present research, NiCrAlYSi coating was prepared using vacuum arc ion plating. The influence of the surface shot peening process on the isothermal oxidation behavior of NiCrAlYSi coating was investigated in detail, which indicated that the surface roughness of NiCrAlYSi coating reduced after the shot peeing. In this process, the compactness and smoothness of NiCrAlYSi coating improved, which could avoid the formation of an abnormal oxidation area in the coating due to the penetration and diffusion of oxygen atoms inside the coating. A uniform and low thickness deviation TGO layer could be generated at the surface. The TGO layer growth rate of NiCrAlYSi coating with 0.4 MPa and 5 min shot peening reduced by 60% compared to no shot peening,and the oxidation resistance of NiCrAlYSi coating improved.

关 键 词：NiCrAlYSi涂层 真空电弧离子镀 喷丸 恒温氧化 热生长氧化层 

分 类 号：TG174.44[金属学及工艺—金属表面处理]