TY - GEN
T1 - Examination of the thermal stability of plasma-sprayed La2Ce2O7/YSZ composite coating
AU - Xu, Ya Xin
AU - Liu, Tao
AU - Li, Chang Jiu
N1 - Publisher Copyright:
© (2015) by ASM International All rights reserved.
PY - 2015
Y1 - 2015
N2 - LCO (La2Ce2O7/), a solid solution of La2O3 in CeO2, is a promising top coating in TBCs. However, it is generally necessary to use LCO as a top coat on YSZ coating to construct a multilayer TBC due to poor mechanical properties of LCO. Therefore, the thermal and chemical stability of LCO/YSZ at high temperature environment become important issue. In this paper, the 50LCO-50YSZ composite coating was deposited using blend powders of YSZ and LCO. The LCO powders used have a nominal particle size range from 10 to 44pm. The LCO/YSZ deposits were exposed at 1300 °C for different durations. The microstructure evolution at the LCO/YSZ interface was investigated by quasi-in-situ SEM and EDS examination. At an exposure temperature of 1300°C, it was observed that some LCO splats in contact with YSZ splats experienced the grain morphology change from columnar one to quasi-axial grains with interface healing and however some grains tended to disappear with thermal exposure. Results indicated that LCO-YSZ composite coating is not phase stable at 1300 °C. Diffusion of La element from LCO splat towards the adjacent YSZ splat occurred during sintering, leading to the formation of La2Zr2O7 within YSZ splat.
AB - LCO (La2Ce2O7/), a solid solution of La2O3 in CeO2, is a promising top coating in TBCs. However, it is generally necessary to use LCO as a top coat on YSZ coating to construct a multilayer TBC due to poor mechanical properties of LCO. Therefore, the thermal and chemical stability of LCO/YSZ at high temperature environment become important issue. In this paper, the 50LCO-50YSZ composite coating was deposited using blend powders of YSZ and LCO. The LCO powders used have a nominal particle size range from 10 to 44pm. The LCO/YSZ deposits were exposed at 1300 °C for different durations. The microstructure evolution at the LCO/YSZ interface was investigated by quasi-in-situ SEM and EDS examination. At an exposure temperature of 1300°C, it was observed that some LCO splats in contact with YSZ splats experienced the grain morphology change from columnar one to quasi-axial grains with interface healing and however some grains tended to disappear with thermal exposure. Results indicated that LCO-YSZ composite coating is not phase stable at 1300 °C. Diffusion of La element from LCO splat towards the adjacent YSZ splat occurred during sintering, leading to the formation of La2Zr2O7 within YSZ splat.
UR - https://www.scopus.com/pages/publications/84971249893
M3 - 会议稿件
AN - SCOPUS:84971249893
T3 - Proceedings of the International Thermal Spray Conference
SP - 806
EP - 810
BT - ASM International - International Thermal Spray Conference and Exposition, ITSC 2015
A2 - Agarwal, Arvind
A2 - Lau, Yuk-Chiu
A2 - Widener, Christian A.
A2 - Turunen, Erja
A2 - Bolelli, Giovanni
A2 - Concustell, Amadeu
A2 - McDonald, Andre
A2 - Toma, Filofteia-Laura
PB - ASM International
T2 - International Thermal Spray Conference and Exposition, ITSC 2015
Y2 - 11 May 2015 through 14 May 2015
ER -