Hot corrosion and thermal shock resistance of Dense-CYSZ/YSZ bilayer thermal barrier coatings systems applied onto Ni-base superalloy

被引:34
作者
de la Roche, Jhonattan [1 ]
Andres Gomez, Pablo [1 ,2 ]
Manuel Alvarado-Orozco, Juan [3 ]
Toro, Alejandro [1 ]
机构
[1] Univ Nacl Colombia, Tribol & Surfaces Grp, Calle 75 79A-51, Medellin 050034, Colombia
[2] Empresas Publ Medellin EPM, Carrera 58 42 125, Medellin 050015, Colombia
[3] Ctr Ingn & Desarrollo Ind CIDESI, Av Playa Pie Cuesta 702, Desarrollo San Pablo 76125, Queretaro, Mexico
基金
欧洲研究理事会;
关键词
TBC systems; YSZ coatings; CYSZ coatings; Thermal shock resistance; Hot corrosion; YTTRIA-STABILIZED ZIRCONIA; SEGMENTATION CRACK DENSITIES; MOLTEN SULFATE; SODIUM-SULFATE; NA2SO4+V2O5 SALT; BEHAVIOR; MECHANISMS; CERIA; YSZ; MICROSTRUCTURE;
D O I
10.1016/j.jeurceramsoc.2020.07.004
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
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 mu m), but the total thickness of the system was kept at 300 mu m. The thermo-me- chanical 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 degrees 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.
引用
收藏
页码:5692 / 5703
页数:12
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