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Hot corrosion and thermal shock resistance of Dense-CYSZ/YSZ bilayer thermal barrier coatings systems applied onto Ni-base superalloy
Journal of the European Ceramic Society ( IF 5.8 ) Pub Date : 2020-07-02 , DOI: 10.1016/j.jeurceramsoc.2020.07.004
Jhonattan de la Roche , Pablo Andrés Gómez , Juan Manuel Alvarado-Orozco , Alejandro Toro

Bilayer thermal barriers coatings of Dense Ceria-Yttria-Stabilized Zirconia (D-CYSZ)/Yttria-Stabilized Zirconia (YSZ) were deposited onto Inconel 625 using atmospheric plasma spray (APS). The thickness of the d-CYSZ layer varied (0, 50, 100, and 150 μm), but the total thickness of the system was kept at 300 μm. The thermo-mechanical resistance of the multilayer system was evaluated through thermal shock tests, in which the bilayer systems evaluated exceeded 500 cycles with percentages of delamination of the coating below 20 % of the exposed area and showed higher thermomechanical resistance than a conventional YSZ system. Hot corrosion (HC) resistance of the bilayer system was evaluated using a salt mixture of 32 wt.% Na2SO4 and 68 wt.% V2O5 at 900 °C. The systems with a d-CYSZ layer showed higher resistance to HC, exhibiting fewer changes into the microstructure and presence of the monoclinic phase despite the presence of vertical cracks in the microstructure.



中文翻译:

应用于镍基高温合金的Dense-CYSZ / YSZ双层热障涂层系统的抗热腐蚀和热冲击性能

使用大气压等离子喷涂(APS)将密集的二氧化铈-氧化钇稳定的氧化锆(D-CYSZ)/氧化钇稳定的氧化锆(YSZ)的双层热障涂层沉积在Inconel 625上。d -CYSZ层的厚度变化(0、50、100和150μm),但系统的总厚度保持在300μm。通过热冲击试验评估了多层系统的热机械电阻,其中所评估的双层系统超过500个循环,涂层的分层百分比低于暴露面积的20%,并且显示出比常规YSZ系统更高的热机械电阻。使用32 wt。%Na 2 SO 4和68 wt。%V 2的盐混合物评估了双层系统的耐热腐蚀(HC)能力O 5在900°C。具有d -CYSZ层的系统对HC的抵抗力更高,尽管在微观结构中存在垂直裂纹,但对微观结构和单斜晶相的变化较小。

更新日期:2020-07-02
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