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High entropy defective fluorite structured rare-earth niobates and tantalates for thermal barrier applications
Journal of Advanced Ceramics ( IF 18.6 ) Pub Date : 2020-06-05 , DOI: 10.1007/s40145-020-0368-7
Zifan Zhao , Heng Chen , Huimin Xiang , Fu-Zhi Dai , Xiaohui Wang , Wei Xu , Kuang Sun , Zhijian Peng , Yanchun Zhou

Rare-earth tantalates and niobates (RE3TaO7 and RE3NbO7) 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 RE3TaO7 and RE3NbO7 that limit their applications as TBC materials. To increase the hardness, high entropy (Y1/3Yb1/3Er1/3)3TaO7, (Y1/3Yb1/3Er1/3)3NbO7, and (Sm1/6Eu1/6Y1/6Yb1/6Lu1/6Er1/6)3(Nb1/2Ta1/2)O7 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 RE3TaO7 and RE3NbO7 (7.9×10−6-10.8×10−6C−1 at room temperature), good phase stability, and good chemical compatibility with thermally grown Al2O3, which make them promising for applications as candidate TBC materials.

中文翻译:

用于热障用途的高熵缺陷萤石结构的稀土铌酸盐和钽酸盐

稀土钽酸盐和铌酸盐(RE 3 TaO 7和RE 3 NbO 7)由于其超低的导热性和比热稳定性更好的特性,已被认为是下一代燃气涡轮发动机中有希望的候选隔热涂层(TBC)材料。氧化钇稳定的氧化锆(YSZ)。但是,维氏硬度和韧性低是RE 3 TaO 7和RE 3 NbO 7的主要缺点,限制了它们作为TBC材料的应​​用。为了提高硬度,需要高熵(Y 1/3 Yb 1/3 Er 1/33 TaO 7,(Y1/3 Yb 1/3 Er 1/33 NbO 7和(Sm 1/6 Eu 1/6 Y 1/6 Yb 1/6 Lu 1/6 Er 1/63(Nb 1/2 Ta本研究设计合成了1/2)O 7。这些高熵陶瓷具有很高的维氏硬度(10.9-12.0 GPa),与单主要成分RE 3 TaO 7和RE 3 NbO 7的热膨胀系数接近(7.9×10 -6 -10.8×10 -6 C室温下为-1),良好的相稳定性以及与热生长的Al 2 O 3的良好化学相容性,这使其有希望用作候选TBC材料。
更新日期:2020-06-05
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