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Effect of Thermal Treatment on the Grain Growth of Nanostructured YSZ Thermal Barrier Coating Prepared by Air Plasma Spraying

机译:热处理对空气等离子喷涂纳米结构YSZ热障涂层晶粒长大的影响

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摘要

A nanostructured thermal barrier coating is prepared by air plasma spraying using the 8wt percent Y_2O_3 partially stabilized zirconia nanopowder 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 con-sistes 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 deg C, whereas over 1000 degC the gains grow rapidly and monoclinic phase noticeably appeares.
机译:通过使用8wt%的Y_2O_3部分稳定的氧化锆纳米粉,其平均粒径为40nm,通过空气等离子体喷涂来制备纳米结构的热障涂层。用SEM,TEM和XRD研究了原料纳米粉体和涂层的微观结构和相组成。发现喷涂后的氧化锆涂层的平均粒径为67 nm,主要由亚稳态四方相和一些单斜相和四方相组成。热处理结果表明,纳米结构涂层的晶粒在900摄氏度以下略微增长,而在1000摄氏度以上,增益迅速增长,并且明显出现单斜晶相。

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