Advanced rare earth tantalate RETaO_(4)(RE=Dy,Gd and Sm) with excellent oxygen/thermal barrier performance  

作　　者：Jun Wang Jianyu Li Chunyu Jiang Jianbo Song Xing Yang Xiaolong Ma Kailiang Luo Peng Wu Xiaoyu Chong Jing Feng 

机构地区：[1]Faculty of Material Science and Engineering,Kunming University of Science and Technology,Kunming,650093,China [2]Shanxi Tianxuan Coating Technology Co.,Ltd,Xi'an,710000,China

出　　处：《Journal of Rare Earths》2024年第8期1595-1603,I0007,共10页稀土学报（英文版）

基　　金：supported by the Yunnan Major Scientific and Technological Project (202302AG050010);the Yunnan Fundamental Research Project (202201BE070001-008);the National Key Research and Development Program of China (2022YFB3708600)。

摘　　要：Thermal barrier coatings(TBCs) materials with lowered the rmal and oxygen ion conductivity can provide thermal and oxidative protection for high te mperature hot-end components in aero nautical engines and gas turbines,The rare-earth tantalate RETaO_(4)(RE=Dy,Gd and Sm) ceramics with monoclinic(m) phase were successfully synthesized via spark plasma sintering.Oxygen vacancies responsible for the thermal and oxygen ion conductivities of RETaO_(4) were demonstrated by atomic-resolution energy dispersive Xray and X-ray photoelectron spectroscopy.Among the three samples,DyTaO_(4) has excellent oxygen/thermal barrier performance.Compared to the current service thermal barrier coating material ZrO_(2)-8 wt% Y_(2)O_(3)(8 YSZ),DyTaO_(4) has an ultra-low oxygen ion conductivity benefiting from low oxygen vacancy concentration and strong stretching force constants.The intrinsic thermal conductivity of DyTaO_(4)is 68.2% less than that of 8 YSZ.Additionally,the thermal expansion rate curves indicate that the phase transformation does not happen from room te mperature to 1200℃.The above results demonstrate that high-growth rate the rmally grown oxide can be retarded by creating dense DyTaO_(4) coating with lowered thermal and oxygen ion conductivity.

关 键 词：Thermal barrier coatings Rare earths Oxygen vacancies Thermal conductivity Oxygen ion conductivity 

分 类 号：V25[一般工业技术—材料科学与工程] V261.933[航空宇航科学与技术—航空宇航制造工程] TG174.4[金属学及工艺—金属表面处理]