大气等离子喷涂距离对TBC性能影响的研究

以7wt%YSZ为原始粉料，在大气等离子喷涂（APS）过程中通过改变喷涂距离获得了三种热障涂层（TBC）样品。通过图像分析法分辨了气孔的显微结构并计算了不同种类气孔所占的比例，利用激光闪射法(LFA)获得了样品的热导率，比较了气孔率与热导率之间的关系。实验结果表明，APS制备样品过程中，喷涂距离不仅对涂层的整体气孔率有影响，也对涂层中气孔的形貌和分布均具有显著的影响，进而使涂层具有不同的热导率特性。

The Influence of Air Plasma Spay Distance on the Properties of TBC

7wt%YSZ powder was used as feedstocks during Air Plasma Spray (APS). Through controlling the spraying distance during the process, we got three different TBC samples. The properties including porosity, thermal conductivity and microstructure were characterized. Through comparison, we found that the spraying distance largely influenced the shape and distribution of the pores, gave different levels of porosities, and thus produced different thermal conductivity.