文献类型：期刊文献

英文题名：YGYSZ/YSZ double ceramic layer thermal barrier coatings: Coating design and failure mechanism during thermal shock test

作者：Xu, Wenhu[1];Shi, Junmiao[1];Zhao, Zheng[1];Yang, Kehan[1];Chen, Xiaolong[2];Ling, Heyu[1];Shi, Jiayang[1];Zhang, Xiancheng[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China;[2]Jinan Univ, Inst Adv Wear & Corros Resistant & Funct Mat, Guangzhou 510632, Peoples R China

年份：2025

卷号：516

外文期刊名：SURFACE & COATINGS TECHNOLOGY

收录：;EI(收录号：20253819205019);WOS:【SCI-EXPANDED(收录号:WOS:001583123900001)】；

基金：This work was supported by the National Natural Science Foundation of China (52375146) .

语种：英文

外文关键词：Thermal barrier coatings; Thermal shock properties; Finite element simulation

摘要：Conventional Yttria-stabilized zirconia (YSZ) Thermal Barrier Coatings (TBCs) suffer from phase transformation and sintering issues at high temperatures, limiting their further application. To overcome these limitations, this study designed ZrO2-9.5Y2O3-5.6Yb2O3-5.2Gd2O3 (YGYSZ)/YSZ double ceramic layer (DCL) TBCs and investigated the influence of YGYSZ layer thickness on their performance through experiments and finite element analysis (FEA). The YGYSZ/YSZ DCL TBCs exhibited superior thermal shock resistance due to the effective inhibition of YSZ phase transition and sintering by the YGYSZ layer. However, the optimal thickness of the YGYSZ layer was found to be crucial. Too thin a YGYSZ layer resulted in rapid sintering of the YSZ layer and interfacial stress concentration, leading to early failure. On the other hand, an excessively thick YGYSZ layer exacerbated thermal mismatch stresses during quenching, reducing the interfacial fracture toughness and promoting interlayer cracking. A thickness range of 200-240 mu m for the YGYSZ layer was identified as optimal for balancing thermal shock resistance and interlayer integrity. The study revealed that the thickness of the YGYSZ layer significantly influenced the temperature field distribution, stress field evolution, and crack propagation behavior of the DCL TBCs, providing a theoretical basis for thickness optimization and reliable preparation of YGYSZ/YSZ DCL TBCs.