Interface microstructure and diffusion of vacuum annealed ceramic coating on superalloy GH202  

作　　者：古一 夏长清 邱冠周 王志法 

机构地区：[1]School of Materials Science and Engineering,Central South University

出　　处：《中国有色金属学会会刊：英文版》2009年第S3期701-705,共5页Transactions of Nonferrous Metals Society of China

基　　金：Project supported by the Postdoctoral Science Foundation of Central South University, China

摘　　要：In order to improve the wear resistance and high-temperature oxidation resistance of superalloy GH202, the ultrafine-grain ceramic coating containing nano-size nickel particles was obtained by flow coat method on the surface of GH202. The interface microstructure between ceramic coating and superalloy GH202 substrate during vacuum diffusion was studied. It is shown that Al2O3 oxide layer and (Ti, N) compound exist in the alloy substrate close to interface. During long time diffusion, nano-size nickel powders gradually congregate and grow up, and the confluent interface appears, which shows that the nano-size nickel powders have the effect of restraining the coating from failure.In order to improve the wear resistance and high-temperature oxidation resistance of superalloy GH202, the ultrafine-grain ceramic coating containing nano-size nickel particles was obtained by flow coat method on the surface of GH202. The interface microstructure between ceramic coating and superalloy GH202 substrate during vacuum diffusion was studied. It is shown that Al2O3 oxide layer and (Ti, N) compound exist in the alloy substrate close to interface. During long time diffusion, nano-size nickel powders gradually congregate and grow up, and the confluent interface appears, which shows that the nano-size nickel powders have the effect of restraining the coating from failure.

关 键 词：GH202 SUPERALLOY NANO-SIZE nickel powder ceramic coating VACUUM annealing MICROSTRUCTURE 

分 类 号：TG174.4[金属学及工艺—金属表面处理]