High-temperature compressive creep behavior and mechanism of Hf6Ta2O17 ceramic as a candidate for thermal barrier coatings

被引：3
|
作者：
Zheng, Y. X. [1 ,2 ]
Hu, X. P. [1 ,2 ]
Liu, S. [1 ,2 ]
Liu, Q. [1 ,2 ]
Zou, Y. [1 ,2 ]
Guo, J. W. [1 ,2 ]
Zhu, W. [1 ,2 ]
机构：
[1] Xiangtan Univ, Sch Mat Sci & Engn, Key Lab Key Film Mat & Applicat Equipment Hunan Pr, Xiangtan 411105, Hunan, Peoples R China
[2] Xiangtan Univ, Sch Mat Sci & Engn, Key Lab Low Dimens Mat & Applicat Technol, Minist Educ, Xiangtan 411105, Hunan, Peoples R China
来源：
CERAMICS INTERNATIONAL | 2023年 / 49卷 / 18期
关键词：
High-temperature creep; Creep mechanism; Grain boundary sliding; Dislocation movement; YTTRIA-STABILIZED ZIRCONIA; PLASTIC-DEFORMATION; CONDUCTIVITY; FLOW;
D O I：
10.1016/j.ceramint.2023.06.248
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：
A novel Hf6Ta2O17 ceramics is prepared by a solid-state reaction method. High-temperature creep behavior of Hf6Ta2O17 and 8YSZ ceramics are investigated by compressive creep test combined with a digital image correlation (DIC) method. It is found that the creep mechanism of Hf6Ta2O17 ceramics is controlled by grain boundary sliding associated with dislocation movement (stress exponent-2-3, and activation energy of 600-620 kJ/mol). Grain boundary sliding accommodated to the interface reaction is the main creep mechanism of 8YSZ ceramics (stress exponent-2, and activation energy of 425-465 kJ/mol). Hf6Ta2O17 ceramics have higher creep resistance than 8YSZ ceramics under the same conditions.
引用
收藏
页码：29905 / 29912
页数：8
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