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采用大气等离子喷涂制备了纳米结构氧化钇稳定的氧化锆热障涂层.运用SEM,TEM和XRD等方法研究了涂层和原料粉末的微观结构和相组成.结果表明,喷涂过程中平均晶粒大小由40 nm变为67 nm,涂层主要由亚稳四方相组成.涂层热处理结果显示,900℃以下晶粒长大速度缓慢,然而1000℃以上晶粒长大速度迅速增加,而且出现较多的单斜相.“,”A nanostructured thermal barrier coating is prepared by air plasma spraying using the 8wt% Y2O3 partially stabilized zirconia nano-powder with an average grain size of 40 nm. The microstructure and phase composition of feedstock nano-powder and coating are investigated using SEM, TEM and XRD. It is found that the as-sprayed zirconia coating has an average grain size of 67 nm and mainly consistes of metastable tetragonal phase, together with some monoclinic phase and tetragonal phase. Thermal treatment results show that the grains of the nanostructured coating grow slightly below 900℃, whereas over 1000℃ the gains grow rapidly and monoclinic phase noticeably appeares.