High-entropy (Y0.2Nd0.2Sm0.2Eu0.2Er0.2)AlO3: A promising thermal/environmental barrier material for oxide/oxide composites
High-entropy (Y0.2Nd0.2Sm0.2Eu0.2Er0.2)AlO3: A promising thermal/environmental barrier material for oxide/oxide composites
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高熵(Y0.2Nd0.2Sm0.2Eu0.2Er0.2)AlO3：一种有前景的氧化物/氧化物复合材料热/环境屏障材料
DOI：
10.1016/j.jmst.2020.02.011
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发表时间：
2020-06
影响因子：
10.9
通讯作者：
Zhou Yanchun
中科院分区：
文献类型：
--
作者：
Zhaoa Zifan;Chen Heng;Xiang Huimin;Dai Fu-Zhi;Wang Xiaohui;Xu Wei;Sun Kuang;Peng Zhijian;Zhou Yanchun
Yttrium aluminum perovskite (YAlO3) is a promising candidate material for environmental barrier coatings (EBCs) to protect Al2O3f/Al2O3ceramic matrix composites (CMCs) from the corrosion of high-temperature water vapor in combustion environments. Nevertheless, the relatively high thermal conductivity is a notable drawback of YAlO3for environmental barrier coating application. Herein, in order to makeREAlO3more thermal insulating, a novel high-entropy rare-earth aluminate ceramic (Y0.2Nd0.2Sm0.2Eu0.2Er0.2)AlO3was designed and synthesized. The as-prepared (Y0.2Nd0.2Sm0.2Eu0.2Er0.2)AlO3ceramic possesses close thermal expansion coefficient (9.02 × 10―6/oC measured from room temperature to 1200 °C) to that of Al2O3. The thermal conductivity of (Y0.2Nd0.2Sm0.2Eu0.2Er0.2) AlO3at room temperature is 4.1 W·m−1K−1, which is almost one third of the value of YAlO3. Furthermore, to effectively prevent the penetration of water vapor from possible pores/cracks of coating layer, which are often observed in T/EBCs, a tri-layer EBC systemREAlO3/RE3Al5O12/(Al2O3f/Al2O3CMCs) is designed. Close thermal expansion coefficient to Al2O3and low thermal conductivity of (Y0.2Nd0.2Sm0.2Eu0.2Er0.2)AlO3, as well as the formation of dense garnet layer at (Y0.2Nd0.2Sm0.2Eu0.2Er0.2)AlO3/Al2O3interface, indicate that this new type of high-entropy ceramic is suitable as a candidate environmental barrier coating material for Al2O3f/Al2O3CMCs.
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