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.
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