Effects of Ta2O5 content on mechanical properties and high-temperature performance of Zr6Ta2O17 thermal barrier coatings

被引：21
作者：
Liu, Qing [1 ,2 ]
Hu, Xiaopeng [1 ,2 ]
Zhu, Wang [1 ,2 ]
Guo, Jinwei [1 ,2 ]
Tan, Zhenyu [1 ,2 ]
机构：
[1] Xiangtan Univ, Sch Mat Sci & Engn, Key Lab Key Film Mat & Applicat Equipment Hunan P, Xiangtan 411105, Hunan, Peoples R China
[2] Xiangtan Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Low Dimens Mat & Applicat Technol, Xiangtan, Hunan, Peoples R China
来源：
JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2021年 / 104卷 / 12期
关键词：
elastic modulus; fracture toughness; hardness; high-temperature performance; Ta2O5; content; Zr6Ta2O17; coating; PHASE-STABILITY; CERAMIC-LAYER; CONDUCTIVITY; BEHAVIOR;
D O I：
10.1111/jace.17990
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：
Zr6Ta2O17/YSZ double ceramic top coat thermal barrier coatings (TBCs) with different Ta2O5 content are prepared by atmospheric plasma spraying (APS). The effects of Ta2O5 content on mechanical properties and high-temperature performance of Zr6Ta2O17 TBCs are investigated. With the decrease in Ta2O5 content, the hardness and fracture toughness of the Zr6Ta2O17 coating increases from 12.833 to 15.117 GPa and from 3.3592 to 3.7753 MPa m(1/2), respectively. The Zr6Ta2O17 coating specimens with different Ta2O5 content do not delaminate from the substrate except the edge peeling after 180 h of oxidation or 2000 thermal cycles at 1150 degrees C. The Zr-12Ta specimen (the molar ratio of ZrO2/Ta2O5 of 0.88:0.12) presents the more excellent mechanical properties and high-temperature performance. The reduction in Ta2O5 content will improve the mechanical properties, high-temperature oxidation, and thermal cycle performance of Zr6Ta2O17/YSZ double ceramic top coat TBCs.
引用
收藏
页码：6533 / 6544
页数：12
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