Corrosion resistance of nonstoichiometric gadolinium zirconate coatings against CaO-MgO-Al2O3-SiO2 silicate

被引：11
作者：
Zhang, Chengguan [1 ]
Fan, Yun [1 ]
Zhao, Juanli [1 ]
Chen, Hongfei [1 ]
Sun, Luchao [2 ]
Yang, Guang [1 ]
Liu, Bin [1 ]
机构：
[1] Shanghai Univ, Sch Mat Sci & Engn, Shanghai 200444, Peoples R China
[2] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
来源：
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2021年 / 41卷 / 06期
基金：
上海市自然科学基金; 中国国家自然科学基金;
关键词：
Thermal barrier coating; Gadolinium zirconate; Nonstoichiometry; Corrosion resistance; THERMAL-BARRIER COATINGS; THEORETICAL ELASTIC STIFFNESS; ORDER-DISORDER PHENOMENA; RARE-EARTH ZIRCONATE; MECHANICAL-PROPERTIES; CONDUCTIVITY; STABILITY; ALUMINA; PYROCHLORE; CERAMICS;
D O I：
10.1016/j.jeurceramsoc.2021.01.016
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：
Gadolinium zirconate is a promising next-generation thermal barrier coating material and its CaO-MgO-Al2O3SiO2 (CMAS) resistance needs to be further increased. In this study, three gadolinium zirconate coatings with different Gd/Zr ratios are successfully prepared via atmospheric plasma spray using amorphous feedstock. Their mechanical properties and corrosion resistance are investigated. The Young?s moduli and hardness of as-sprayed coatings are comparable with the gadolinium zirconate coatings reported in previous literature. Furthermore, the higher Gd content promotes the formation of the Gd-apatite and the depletion rate of CMAS corrosion. As a result, the infiltration depth of Gd2.3Zr1.7O6.85 coating after 24 h annealing decreases up to 35 % compared with those of Gd2.0Zr2.0O7.0 and Gd1.8Zr2.2O7.1, exhibiting an enhanced long-term corrosion resistance. This work develops a viable fabrication method to produce non-stoichiometric gadolinium zirconate coatings with tailorable CMAS corrosion resistance and is expected to promote the future design of thermal barrier coatings with long service life.
引用
收藏
页码：3687 / 3695
页数：9
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