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High entropy defective fluorite structured rare-earth niobates and tantalates for thermal barrier applications
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High entropy defective fluorite structured rare-earth niobates and tantalates for thermal barrier applications
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Journal Article
High entropy defective fluorite structured rare-earth niobates and tantalates for thermal barrier applications
2020
Overview
Rare-earth tantalates and niobates (RE
3
TaO
7
and RE
3
NbO
7
) have been considered as promising candidate thermal barrier coating (TBC) materials in next generation gas-turbine engines due to their ultra-low thermal conductivity and better thermal stability than yttria-stabilized zirconia (YSZ). However, the low Vickers hardness and toughness are the main shortcomings of RE
3
TaO
7
and RE
3
NbO
7
that limit their applications as TBC materials. To increase the hardness, high entropy (Y
1/3
Yb
1/3
Er
1/3
)
3
TaO
7
, (Y
1/3
Yb
1/3
Er
1/3
)
3
NbO
7
, and (Sm
1/6
Eu
1/6
Y
1/6
Yb
1/6
Lu
1/6
Er
1/6
)
3
(Nb
1/2
Ta
1/2
)O
7
are designed and synthesized in this study. These high entropy ceramics exhibit high Vickers hardness (10.9–12.0 GPa), close thermal expansion coefficients to that of single-principal-component RE
3
TaO
7
and RE
3
NbO
7
(7.9×10
−6
-10.8×10
−6
C
−1
at room temperature), good phase stability, and good chemical compatibility with thermally grown Al
2
O
3
, which make them promising for applications as candidate TBC materials.
Publisher
Tsinghua University Press,School of Engineering and Technology, China University of Geosciences, Beijing 100083, China%Science and Technology on Advanced Functional Composite Laboratory, Aerospace Research Institute of Materials & Processing Technology, Beijing 100076, China%Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China%Shanghai Chenhua Science and Technology Corporation Ltd., Shanghai 201804, China%School of Engineering and Technology, China University of Geosciences, Beijing 100083, China,Science and Technology on Advanced Functional Composite Laboratory, Aerospace Research Institute of Materials & Processing Technology, Beijing 100076, China
