Interface microstructure and diffusion of vacuum annealed ceramic coating on superalloy GH202
来源期刊：中国有色金属学报(英文版)2009年增刊第3期
论文作者：古一 夏长清 邱冠周 王志法
文章页码：701 - 705
Key words：GH202 superalloy; nano-size nickel powder; ceramic coating; vacuum annealing; microstructure
Abstract: 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.
