采用一种新的方法,将Y2O3稳定的ZrO2前驱体溶液雾化注入直流等离子体中直接制备热障涂层.扫描电镜、透射电镜、X射线衍射分析、激光闪烁法分别观察分析了涂层的显微组织、纳米晶粒、相结构和热导率,排水法、冷热冲击法分别检测了涂层密度和热循环性能.实验结果显示:等离子体喷涂液体制备出来的热障涂层不具有层状组织,晶粒尺寸小于100nm,组成相为四方相,硬度为350左右,热导率在1.2～1.5 W/m·K范围,涂层中存在16%左右的孔隙率,具有比常规微米结构热障涂层更优越的热循环性能.分析结果表明:液体注入热等离子体中的雾化沉积既区别于物理化学气相沉积,又区别于粉末注入热等离子体中的熔化沉积,属于表面工程技术下的交叉领域.
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