摘要
作为一种潜在的环境障涂层材料,高熵稀土双硅酸盐的热物理化学性质至关重要.本文报道了一种新型(Gd_(1/7)Dy_(1/7)Ho_(1/7)Er_(1/7)Tm_(1/7)Yb_(1/7)Lu_(1/7))_(2)Si_(2)O_(7)高熵稀土双硅酸盐(7HERED),它兼具与SiC_(f)/SiC复合材料良好的热膨胀系数匹配性、超低的热导率(1273K时为1.5Wm^(-1)K^(-1))、高达1973K的高温稳定性以及在1673K下优异的耐水氧腐蚀性等优异的综合性能.这种优异的综合性能可归因于7HERED的高熵效应和晶格畸变效应.本文所开发的7HERED有望作为下一代环境障涂层材料.
The unique combination of a series of thermal properties and water-oxygen corrosion resistance is crucial for high-entropy disilicates serving as environmental barrier coating materials.Here,we report a novel(Gd_(1/7)Dy_(1/7)Ho_(1/7)Er_(1/7)Tm_(1/7)Yb_(1/7)Lu_(1/7))_(2)Si_(2)O_(7)high-entropy disilicate(7HERED)that simultaneously possesses excellent match of coefficient of thermal expansion with SiC_(f)/SiC composites across 473–1973 K,ultralow thermal conductivity(1.5 Wm^(−1)K^(−1)at 1273 K),superior high-temperature stability up to 1973 K,and water-oxygen corrosion resistance at 1673 K.Such superior properties are attributed to the high-entropy and lattice-distortion effects.Our 7HERED shows great potential as a next-generation environmental barrier coating material.
作者
刘洋
庄磊
谢平波
俞呼雷
褚衍辉
Yang Liu;Lei Zhuang;Pingbo Xie;Hulei Yu;Yanhui Chu(School of Materials Science and Engineering,South China University of Technology,Guangzhou 510641,China)
基金
supported by the National Key Research and Development Program of China(2022YFB3708600)
the National Natural Science Foundation of China(52122204)。
