Solution Precursor Thermal Spraying of Gadolinium Zirconate for Thermal Barrier Coating
Solution Precursor Thermal Spraying of Gadolinium Zirconate for Thermal Barrier Coating
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DOI：
10.1016/j.jeurceramsoc.2021.11.050
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发表时间：
2021-11
影响因子：
5.7
通讯作者：
K. Leng;A. Romero;F. Venturi;I. Ahmed;T. Hussain
中科院分区：
文献类型：
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作者：
K. Leng;A. Romero;F. Venturi;I. Ahmed;T. Hussain
锆酸钆（GZ）是一种很有吸引力的热障涂层材料。然而，与氧化钇稳定的氧化锆（YSZ）相比，单层GZ涂层具有差的热循环寿命。本文采用溶液前驱体超音速火焰喷涂（SP-HVOF）技术制备了双层GZ/YSZ热障涂层，并与单层YSZ热障涂层的热循环性能进行了比较。研究了溶液前驱体GZ的温度行为，并进行了单飞溅试验以获得优化的喷雾参数。在热循环测试中，单层YSZ在85 ± 5次循环时达到20%失效，而双层GZ/YSZ在70 ± 15次循环时达到20%失效。单层失效在面漆/TGO界面，而双层失效在GZ/YSZ界面和面漆/TGO界面。此外，Gd扩散发生在GZ/YSZ界面附近，导致GZ层中的孔隙。
Gadolinium zirconate (GZ) is an attractive material for thermal barrier coatings (TBCs). However, a single layer GZ coating has poor thermal cycling life compared to Yttria Stabilized Zirconia (YSZ). In this study, Solution Precursor High Velocity Oxy-Fuel (SP-HVOF) thermal spray was used to produce a double layer GZ/YSZ TBC and compared the thermal cycling performance with the single layer YSZ TBC. The temperature behaviour of the solution precursor GZ was studied, and single splat tests were carried out to obtain an optimised spray parameter. In thermal cycling tests, the single-layer YSZ reached 20 % failure at 85 ± 5 cycles, whereas the double-layer GZ/YSZ was at 70 ± 15 cycles. The single-layer failed at the topcoat/TGO interface, whereas the double-layer failed at GZ/YSZ interface and topcoat/TGO interface. Moreover, Gd diffusion occurred near the GZ/YSZ interface, resulting in porosities in the GZ layer.