采用YSZ(8%Y2O3-ZrO2,质量分数)纳米粉末,经大气等离子喷涂(APS)方法制备得YSZ纳米热障涂层(TBC).喷涂前的粉末颗粒直径为30-50 nm,晶粒尺寸约12 nm.对涂层的分析结果表明:YSZ纳米涂层平均晶粒尺寸在20-30 nm,有个别粗晶直径达200-300 nm.涂层由立方相c-ZrO2和四方相t'-ZrO2组成,t′相内存在畴结构.涂层内孔洞细小弥散,多呈闭合式.TEM下可见位错缠结和富层错的板条带结构.
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