Effect of melting state on the thermal shock resistance and thermal conductivity of APS ZrO2–7.5 wt.% Y2O3 coatings
Effect of melting state on the thermal shock resistance and thermal conductivity of APS ZrO2–7.5 wt.% Y2O3 coatings
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DOI：
10.1016/j.surfcoat.2015.03.011
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发表时间：
2015-05
影响因子：
5.4
通讯作者：
Xuemei Song;Ziwei Liu;T. Suhonen;T. Varis;Liping Huang;Xuebin Zheng;Yi Zeng
中科院分区：
文献类型：
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作者：
Xuemei Song;Ziwei Liu;T. Suhonen;T. Varis;Liping Huang;Xuebin Zheng;Yi Zeng
两种类型的ZrO 2 - 7.5wt.%的显微结构利用扫描电镜和电子背散射衍射分析对等离子喷涂（APS）制备的不同柱状晶含量的Y2 O3（YSZ）涂层进行了研究。柱状晶和等轴晶的形成机制的差异，其特征在于使用收集在一个水容器中的颗粒，从它被发现，这些机制是密切相关的飞行中的颗粒的熔融状态。此外，还发现，喷涂涂层的柱状晶浓度越高，其抗热震性越高。这意味着可以简单地通过引入更多的柱状晶粒来改善APS YSZ涂层的抗热震性，因为这增加了它们的热导率。利用这些知识，成功制备了具有良好抗热震性和1100 °C下热导率为0.81 W·（m·K）− 1的YSZ涂层。
The microstructures of two types of ZrO2–7.5 wt.% Y2O3(YSZ) coatings fabricated by air plasma spraying (APS) but containing different amounts of columnar grains were investigated through scanning electron microscopy and electron backscatter diffraction analysis. Differences in the formation mechanisms of columnar and equiaxed grains were characterized using particles collected in a water container, from which it was found that these mechanisms are closely related to the melted state of the in-flight particles. Furthermore, it was found that the higher the columnar grain concentration of an as-sprayed coating, the higher its thermal shock resistance. This means that it is possible to improve the thermal shock resistance of APS YSZ coatings simply by introducing more columnar grains, as this increases their thermal conductivity. Using this knowledge, YSZ coatings with good thermal shock resistance and a thermal conductivity of 0.81 W·(m·K)− 1at 1100 °C were successfully prepared.