A highly porous thermal barrier coating based on Gd2O3-Yb2O3 co-doped YSZ

被引：28
作者：
Bobzin, Kirsten [1 ]
Zhao, Lidong [1 ]
Oete, Mehmet [1 ]
Koenigstein, Tim [1 ]
机构：
[1] Rhein Westfal TH Aachen, Surface Engn Inst, Kackertstr 15, D-52072 Aachen, Germany
来源：
SURFACE & COATINGS TECHNOLOGY | 2019年 / 366卷
关键词：
Thermal barrier coating; High energy ball milling; Heat-treatment; Thermal shock behavior; Thermal conductivity; STABILIZED ZIRCONIA; PHASE-STABILITY; CONDUCTIVITY; MICROSTRUCTURE; BEHAVIOR; GD2O3;
D O I：
10.1016/j.surfcoat.2019.03.064
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
In this study, a highly porous TBC based on Gd2O3-Yb2O3 co-doped YSZ was produced by plasma spraying using a spray powder, specially prepared by high energy ball milling. The coating was characterized in terms of the microstructure, phase composition, hardness and thermal conductivity. The thermal shock behavior was evaluated using thermal cyclic test at T = 1150 degrees C. A free-standing coating was heat-treated in a furnace at T = 1150 degrees C for t = 500 h to investigate the effect of sintering on the microstructure and properties of the coating. Results revealed that the coating in as-sprayed condition exhibited a highly porous microstructure with a porosity of p = 39%. The highly porous TBC presented a better thermal shock behavior compared to a conventional TBC. After heat-treatment, the value of porosity dropped to p = 26%, which still corresponds to a highly porous microstructure. Both the thermal conductivity and hardness of the coating significantly increased due to sintering. However, the coating exhibited low thermal conductivity values of kappa < 1.1 W/m.K at high temperatures.
引用
收藏
页码：349 / 354
页数：6
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