铜基材上热障涂层的激光熔敷  

Laser cladding of thermal barrier coatings on copper

作　　者：高阳[1] 潘峰[1] 佟百运[2] 梁勇[2] 师昌绪[2] 

机构地区：[1]清华大学材料科学与工程系,北京100084 [2]中国科学院金属研究所,沈阳110016

出　　处：《中国有色金属学报》2003年第2期315-318,共4页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(59971025)

摘　　要：采用5kW连续CO2激光热源实现了在铜基材上熔敷热障涂层,得到无孔隙、与基体冶金结合的密实ZrO2陶瓷层。发现在ZrO2/NiCoCrAlY界面上生成了Al2O3等氧化物中间层。NiCoCrAlY结合层由胞状晶、胞状枝晶及枝晶组成,其中γ′和β强化相的析出使显微硬度值显著提高。针对TiO2 Al添加剂可以避免裂纹产生,提出陶瓷涂层高温化学反应机制和添加剂中钛在晶界间扩散结合机制。Zirconia thermal barrier coatings were obtained on copper by a 5 kW CO2 laser, and dense coatings without porosity and with metallurgical bond to substrates were produced. Al2O3 intermediate layer is found at the interface between NiCoCrAlY layer and ZrO2 ceramic layer. NiCoCrAlY bond coatings are composed of cells, cellular dendrites and dendrites, and the precipitation of γ′ and β phases increases the microhardness values. TiO2Al dopants can avoid cracks, so the chemical reaction mechanism in ceramic coatings at elevated temperature, and adhesion mechanism by titanium additive diffusion among the grain boundary were proposed.

关 键 词：热障涂层 激光熔敷 铜基材 高炉 铁口 渣口 

分 类 号：TG174.453[金属学及工艺—金属表面处理] TF573.6[金属学及工艺—金属学]