Properties evaluation and failure behaviour of plasma sprayed Y4Hf3O12 for thermal barrier coating applications

被引：7
作者：
Dang, Xian [1 ,2 ,3 ]
Yuan, Jieyan [1 ,2 ]
Li, Xinyang [1 ,2 ]
Huang, Zhulin [1 ,2 ]
Hu, Xiaoye [1 ,2 ]
Li, Yue [1 ,2 ]
Cao, Xueqiang [4 ]
机构：
[1] Chinese Acad Sci, Key Lab Mat Phys, Hefei 230031, Peoples R China
[2] Chinese Acad Sci, Inst Solid State Phys, Anhui Key Lab Nanomat & Nanotechnol, Hefei 230031, Peoples R China
[3] Anhui Univ, Inst Phys Sci & Informat Technol, Hefei 230039, Peoples R China
[4] Wuhan Univ Technol, State Key Lab Silicate Mat Architectures, Wuhan 430070, Peoples R China
来源：
SURFACE & COATINGS TECHNOLOGY | 2023年 / 454卷
关键词：
Thermal barrier coatings; Y4Hf3O12; Thermal cycling; Interface stress; Failure mechanism; YTTRIA-STABILIZED ZIRCONIA; PHASE-STABILITY; STRONTIUM ZIRCONATE; CERAMIC MATERIALS; MICROSTRUCTURE; DELAMINATION; TEMPERATURE; LAYER; YSZ; RADIATION;
D O I：
10.1016/j.surfcoat.2022.129162
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
In this study, thermal barrier coating (TBC) of Y4Hf3O12 compound was produced by the plasma spray method. Phase composition, microstructure, thermophysical properties, high temperature stability, as well as CaO-MgO-Al2O3-SiO2 (CMAS) corrosion behaviour were investigated for Y4Hf3O12 coating. Results reveal Y4Hf3O12 coating of defective fluorite structure, as a result of high concentration of Y cation, to exhibit low thermal conductivity, outstanding structure stability up to 1300 degrees C and super good protectiveness against CMAS, but with relative low TEC. Preliminary findings support that Y4Hf3O12 ceramic can be top-layer materials on YSZ to form a double-ceramic-layer (DCL) TBC system. Thus, by adding a YSZ buffer layer, the Y4Hf3O12/YSZ DCL TBC was further developed on Ni-based superalloy and its thermal cycling durability was evaluated. It indicates that this DCL TBC system could undertake a cyclic lifetime longest to similar to 459 cycles. The failure behaviour in thermal shock test is related to the crack evolution induced by a combination of TEC mismatch, TGO growth and sintering of top-layer Y4Hf3O12.
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页数：14
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