Failure of plasma sprayed nano-zirconia-based thermal barrier coatings exposed to molten CaO-MgO-Al2O3-SiO2 deposits

被引：88

作者：

Zhou, Xin ^{[1
]}

Chen, Tao ^{[1
]}

Yuan, Jieyan ^{[1
]}

Deng, Zhonghua ^{[2
]}

Zhang, Hao ^{[1
]}

Jiang, Jianing ^{[1
]}

Cao, Xueqiang ^{[1
]}

机构：

[1] Wuhan Univ Technol, State Key Lab Silicate Mat Architectures, 122 Luoshi Rd, Wuhan 430070, Hubei, Peoples R China

[2] BOE Technol Co Ltd, Mianyang, Sichuan, Peoples R China

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2019年 / 102卷 / 10期

基金：

中国国家自然科学基金;

关键词：

atmospheric plasma spraying; CMAS degradation; nanostructured YSZ coating; HIGH-TEMPERATURE ATTACK; VOLCANIC ASH; CMAS; YTTRIA; DEGRADATION; MECHANISMS; BEHAVIOR; INFILTRATION; RESISTANT; CORROSION;

D O I：

10.1111/jace.16498

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：

Recently, nanostructured thermal barrier coatings have received considerable attention because of some superior properties in comparison with their conventional counterpart. In this study, nanostructured 8 wt% yttria-stabilized zirconia (n-YSZ) coatings were deposited by atmospheric plasma spraying, and the degradation behavior caused by molten calcium-magnesium-aluminon-silicate (CMAS) attack was investigated. Results showed that the thermo-chemical reaction product between CMAS and YSZ (both powders and coatings) is different with the change of CMAS content. At low CMAS concentration, a cubic phase is generated by the diffusion of Ca into YSZ grains. As compared to the conventional YSZ, less C-ZrO(2 )is detected for n-YSZ. When CMAS reaches a certain concentration (eg 15 mg/cm(2)), disruptive phase transformation from tetragonal to monoclinic will occur and the reaction is more readily for n-YSZ. Two different chemical reaction mechanisms governing the CMAS content effect were proposed. It should be noted that the nanozone in the coatings plays an important role in the CMAS degradation process, which enhances CMAS infiltration rate and accelerates the chemical reaction, leading to a poor CMAS resistance of the nanostructured coating than that of the conventional counterpart.

引用

页码：6357 / 6371

页数：15

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