Production and characterization of Nd and Dy doped lanthanum zirconate-based thermal barrier coatings

被引:28
作者
Karabas, Muhammet [1 ,2 ]
机构
[1] Istanbul Tech Univ, Dept Met & Mat Engn, TR-34469 Istanbul, Turkey
[2] Hakkari Univ, Dept Mat Sci & Engn, TR-30110 Hakkari, Turkey
关键词
Thermal barrier coatings; Lanthanum zirconate; Plasma spray; Thermal conductivity; FAILURE MECHANISMS; CONDUCTIVITY; MICROSTRUCTURE; TRANSITION; STABILITY; CERAMICS; STRENGTH; BEHAVIOR; SHOCK;
D O I
10.1016/j.surfcoat.2020.125864
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
In this study, thermal barrier coatings in (La-0.7(Nd, Dy)(0.3))(2)Zr2O7 compound were produced by the plasma spray method as a single and double layer with YSZ. Microstructure, X-ray diffraction analysis, thermal conductivity measurements in the temperature range of 25-805 degrees C, tensile adhesion strengths, and thermal cycle tests at 1250-1300 degrees C of the coatings were performed. It was observed that the thermal conductivity values of single-layer and double-layer coatings were lower than in the undoped lanthanum zirconate coating, and that thermal conductivity value increased with increasing temperature. According to thermal-cycle test results, the single-layer Dy, Nd doped lanthanum zirconate-based coating was damaged at 163 and 300 cycles respectively. There was no damage after 400 cycles in the double-layer coatings. The adhesion-strength values of single-layer coatings were lower than those of double-layer coatings. Such results imply that LDZ and LNZ ceramics can be top-layer materials on YSZ for a double-layer TBC system.
引用
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页数:8
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