Phase Stability and Thermal Shock Resistance of Gd2O3 Doped La2Ce2O7 Thermal Barrier Coatings
(LaxGd1–x)2Ce2O7(x=0,0.1,0.2,0.3)with single fluorite structure were synthesized by solid-state sintering at 1400 ℃ for 24h.The thermal conductivity and phase stability results were compared and the results indicated that,(La0.8Gd0.2)2Ce2O7 had low thermal conductivity and good phase stability from room temperature to 1400 ℃,hence designated as the optimal thermal barrier coating material among the Gd2O3 doped La2Ce2O7 ceramics.Besides,after 100h heat treatment at 1400 ℃,there was no phase transformation in(La0.8Gd0.2)2Ce2O7 bulk,indicating high temperature phase stability.Moreover,the corresponding double-ceramic-layer(DCL)(La0.8Gd0.2)2Ce2O7/YSZ TBCs had better thermal shock resistance ability than that of La2Ce2O7/YSZ TBCs,which was around 109 cycles at 1200 ℃.However,the failure modes was similar to that of La2Ce2O7/YSZ TBCs,which was still layer-by-layer spallation in(La0.8Gd0.2)2Ce2O7 ceramic layer due to the sintering of the ceramic coating.
Thermal barrier coatings (TBCs) La2Ce2O7 Phase stability Thermal shock resistance Thermal conductivity
Gao Lihua Jia Fang Ji Xiaojuan Zhang Deming
Beijing General Research Institute of Mining and Metallurgy,Beijing 100160,China;Beijing Engineering Technology Research Centre of Surface Strengthening and Repairing of Industry Parts,Beijing 102206,China
国际会议
北京
英文
1349-1354
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）