首页|Advanced rare earth tantalate RETaO4(RE=Dy,Gd and Sm)with excellent oxygen/thermal barrier performance

Advanced rare earth tantalate RETaO4(RE=Dy,Gd and Sm)with excellent oxygen/thermal barrier performance

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Thermal barrier coatings(TBCs)materials with lowered thermal and oxygen ion conductivity can provide thermal and oxidative protection for high temperature hot-end components in aeronautical engines and gas turbines.The rare-earth tantalate RETaO4(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 RETaO4 were demonstrated by atomic-resolution energy dispersive X-ray and X-ray photoelectron spectroscopy.Among the three samples,DyTaO4 has excellent oxygen/thermal barrier performance.Compared to the current service thermal barrier coating material ZrO2-8 wt％Y2O3(8 YSZ),DyTaO4 has an ultra-low oxygen ion conductivity benefiting from low oxygen va-cancy concentration and strong stretching force constants.The intrinsic thermal conductivity of DyTaO4 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 temperature to 1200 ℃.The above results demonstrate that high-growth rate thermally grown oxide can be retarded by creating dense DyTaO4 coating with lowered thermal and oxygen ion conductivity.

Thermal barrier coatingsRare earthsOxygen vacanciesThermal conductivityOxygen ion conductivity

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

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Faculty of Material Science and Engineering,Kunming University of Science and Technology,Kunming,650093,China

Shanxi Tianxuan Coating Technology Co.,Ltd.,Xi'an,710000,China

Yunnan Major Scientific and Technological ProjectYunnan Fundamental Research ProjectNational Key Research and Development Program of China

202302AG050010202201BE070001-0082022YFB3708600

2024

10.1016/j.jre.2024.05.012

稀土学报(英文版)
中国稀土学会

稀土学报(英文版)

CSTPCDEI
影响因子：1.3
ISSN：1002-0721
年,卷(期)：2024.42(8)
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