Comparative investigation on the hot corrosion failure of YSZ and GdYb-YSZ double-ceramic-layer thermal barrier coatings under Na2SO4+V2O5 molten salts

被引：16

作者：

Xiang, Yong ^{[1
]}

Yan, Kai ^{[1
]}

Yu, Haiyuan ^{[2
]}

Guo, Yuwei ^{[2
]}

Ying, Yuxi ^{[2
]}

Li, Zhenrui ^{[2
]}

Sun, Jian ^{[3
]}

Fang, Chaogang ^{[4
]}

机构：

[1] China Univ Petr, Coll Mech & Transportat Engn, Beijing 102249, Peoples R China

[2] Beijing Beiye Funct Mat Co LTD, Mat Res Inst, Beijing 100192, Peoples R China

[3] China United Gas Turbine Technol Co LTD, Beijing 100015, Peoples R China

[4] Sichuan Ind Metrol & Testing Inst, Chengdu 610031, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2023年 / 49卷 / 11期

基金：

中国国家自然科学基金; 北京市自然科学基金;

关键词：

Thermal barrier coatings; YSZ; GdYb-YSZ; Hot corrosion; Failure mechanism; PHASE-STABILITY; THERMOPHYSICAL PROPERTIES; OPTICAL BASICITY; BEHAVIOR; SULFATE; ZRO2; RE; CONDUCTIVITY; DEGRADATION; EVOLUTION;

D O I：

10.1016/j.ceramint.2023.02.245

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：

The 5.2Gd2O3-5.6Yb2O3-9.5Y2O3 co-doped ZrO2 (GdYb-YSZ) double-ceramic-layer (DCL) thermal barrier coat-ings (TBCs) were prepared by atmospheric plasma spraying (APS) in this work. Hot corrosion behavior and failure mechanism of the APS GdYb-YSZ DCL and single-layer yttria partially stabilized zirconia (YSZ) TBCs under the Na2SO4+V2O5 molten salts were comparably investigated. The YSZ coating suffered from severe breakage after the hot corrosion test due to its poor corrosion resistance and easy infiltration by molten salts. In contrast, GdYb-YSZ DCL coating exhibited a better resistance to crack propagation and a significantly longer corrosion lifetime than the YSZ coating, which was attributed to the protective effect of the upper GdYb-YSZ layer. On the one hand, the superior phase stability of the GdYb-YSZ DCL coating could slow down the gener-ation speed of phase transformation stress. On the other hand, the higher corrosion reaction rate of the upper GdYb-YSZ layer could suppress the further infiltration of molten salts into the inner TBCs, which improved the structural integrity of TBCs in corrosive environments.

引用

页码：18678 / 18688

页数：11