含纳米Ni粉高温陶瓷涂层/GH202合金界面反应的研究  

The Study on Interface Reaction between High-temperature Ceramic Coating Containing Nano-size Nickel Powder and Super Alloy GH202

作　　者：古一[1] 夏长清[1] 邱冠周[1] 

机构地区：[1]中南大学,长沙410083

出　　处：《表面技术》2010年第1期9-11,共3页Surface Technology

基　　金：中南大学博士后基金资助项目

摘　　要：涂层失效一般是由涂层与基底界面的显微组织演变引起的,对高温下含纳米Ni粉的陶瓷涂层与合金组织的演变进行了研究,结果表明:陶瓷涂层/合金试样在900℃下进行真空扩散退火后,合金基底内在靠近界面的附近依次出现了Al2O3的晶间氧化物和针状TiN氮化物析出层;在长时间扩散过程中,纳米镍粉逐渐聚集长大,与合金基底在界面处融为一体,形成涂层与基体的咬合,使涂层与基体的结合趋向于冶金结合,具有抑制涂层失效的作用。The failure of coatings is mainly caused by the behavior of microstructure on interface of the coating and substrate. The behavior of microstructure on interface of high-temperature ceramic coating containing nano-size nickel powder and super alloy GH2O2 during vacuum diffusion was studied. The results show that Al2O3 oxide layer and Ti, N compound exist respectively in the alloy substrate close to interface. During long time diffusion, nano-size nickel powders gradually congregate and grow up, and the confluent interface appeares, which shows that the nano-size nickel powders have the effect of restraining the coating from failure.

关 键 词：纳米镍粉 陶瓷涂层 真空退火 组织 

分 类 号：TG174.453[金属学及工艺—金属表面处理]