Key influencing factors for the thermal shock resistance of La2Zr2O7-based multilayer TBCs

被引：22
作者：
Bobzin, Kirsten [1 ]
Zhao, Lidong [1 ]
Wietheger, Wolfgang [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 | 2020年 / 396卷
关键词：
Thermal barrier coating; Multilayer; Lanthanum zirconate; Thermal shock resistance; BARRIER COATINGS; LANTHANUM ZIRCONATE; THERMOPHYSICAL PROPERTIES; CYCLING BEHAVIOR; STABILITY; DURABILITY; STRESSES; DESIGN; BEAM;
D O I：
10.1016/j.surfcoat.2020.125951
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
In this study, different multilayer thermal barrier coatings (TBCs) made from La2Zr2O7(LZ), ZrO2-7 wt% Y2O3 (YSZ) and a freestanding LZ-YSZ coat were designed and produced by plasma spraying to determine the key influencing factors on the thermal shock resistance of LZ-based multilayer TBCs. The coatings were characterized in terms of their microstructure, phase composition and thermal expansion coefficient. The thermal shock behavior of the TBCs was evaluated using thermal cyclic tests at T = 1300 degrees C as well as at T = 1150 degrees C. The results show that the compressive stresses in the LZ top coat decreased with an increasing coating thickness of the YSZ interlayer. The LZ top coat failed in the interface areas to the YSZ interlayer for an YSZ interlayer that was not thick enough. Sintering ceramic coats significantly influenced the thermal shock resistance.
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页数：13
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