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Thermal diffusivity/microstructure relationship in Y-PSZ thermal barrier coatings

机译:Y-PSZ热障涂层的热扩散率/微观结构关系

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A set of yttria partially stabilized zirconia coatings with different thickness was deposited on flat nickel-base alloy coupons by air plasma spray (APS) under uncontrolled temperature conditions. In this way, the length of the spraying process(and consequently the coating thickness) had a direct effect on phase composition as well as on the thermal properties of the material. In particular, both the monoclinic phase percentage and thermal diffusivity increased considerably with the thickness.Because this trend was observed together with a slight but clearly visible increase in the total porosity, the interpretation of the results was not straightforward, but required a detailed discussion of the thermal transport mechanism. Considering thecomplex microstructure typical of APS coatings and the relevant role of porosity, it was shown how a modest reduction in the fraction of closed pores can account for the observed increase in diffusivity. It was then proposed that the volume changeassociated with the progressive tetragonal to monoclinic phase transformation can be responsible for the reduction of the closed porosity of lenticular shape oriented parallel to the surface, in spite of the observed increase in the total porosity.
机译:在不受控制的温度条件下,通过空气等离子喷涂(APS)将一组具有不同厚度的氧化钇部分稳定的氧化锆涂层沉积在平坦的镍基合金试样上。这样,喷涂过程的长度(以及涂层厚度)直接影响相组成以及材料的热性能。特别是,单斜晶相百分数和热扩散率均随厚度的增加而显着增加,因为观察到这种趋势以及总孔隙率略有增加但明显可见,因此对结果的解释并不简单,但需要详细讨论热传输机制。考虑到典型的APS涂层的复杂微观结构和孔隙率的相关作用,表明封闭孔分数的适度降低可以解释所观察到的扩散率增加。因此提出,尽管观察到总孔隙率增加,但与渐进的四方相向单斜晶相转变有关的体积变化仍可导致平行于表面取向的双凸透镜形状的封闭孔隙率降低。

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