High-entropy (Nd0.2Sm0.2Eu0.2Y0.2Yb0.2)(4)Al(2)O(9)with good high temperature stability, low thermal conductivity, and anisotropic thermal expansivity

doi:10.1007/s40145-020-0399-0

CORC > 金属研究所 > 中国科学院金属研究所

	High-entropy (Nd0.2Sm0.2Eu0.2Y0.2Yb0.2)(4)Al(2)O(9)with good high temperature stability, low thermal conductivity, and anisotropic thermal expansivity
	Zhao, Zifan 1,3; Xiang, Huimin 3; Chen, Heng 3; Dai, Fu-Zhi 3; Wang, Xiaohui 2; Peng, Zhijian 1; Zhou, Yanchun 3
刊名	JOURNAL OF ADVANCED CERAMICS
	2020-10-01
卷号	9 期号:5 页码:595-605
关键词	(Nd0 2Sm0 2Eu0 2Y0 2Y0 2) high-entropy ceramics (HECs) environmental barrier coatings phase stability thermal properties
ISSN号	2226-4108
DOI	10.1007/s40145-020-0399-0
通讯作者	Peng, Zhijian(pengzhijian@cugb.edu.cn) ; Zhou, Yanchun(yczhou@alum.imr.ac.cn)
英文摘要	The critical requirements for the environmental barrier coating (EBC) materials of silicon-based ceramic matrix composites (CMCs) include good tolerance to harsh environments, thermal expansion matches with the interlayer mullite, good high-temperature phase stability, and low thermal conductivity. Cuspidine-structured rare-earth aluminates RE(4)Al(2)O(9)have been considered as candidates of EBCs for their superior mechanical and thermal properties, but the phase transition at high temperatures is a notable drawback of these materials. To suppress the phase transition and improve the phase stability, a novel cuspidine-structured rare-earth aluminate solid solution (Nd0.2Sm0.2Eu0.2Y0.2Yb0.2)(4)Al(2)O(9)was designed and successfully synthesized inspired by entropy stabilization effect of high-entropy ceramics (HECs). The as-synthesized HE (Nd0.2Sm0.2Eu0.2Y0.2Yb0.2)(4)Al(2)O(9)exhibits a close thermal expansion coefficient (6.96x10(-6)K(-1)at 300-1473 K) to that of mullite, good phase stability from 300 to 1473 K, and low thermal conductivity (1.50 W center dot(m-1)center dot K(-1)at room temperature). In addition, strong anisotropic thermal expansion has been observed compared to Y(4)Al(2)O(9)and Yb4Al2O9. The mechanism for low thermal conductivity is attributed to the lattice distortion and mass difference of the constituent atoms, and the anisotropic thermal expansion is due to the anisotropic chemical bonding enhanced by the large size rare-earth cations.
WOS研究方向	Materials Science
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000576572000008
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/140835]
专题	金属研究所_中国科学院金属研究所
通讯作者	Peng, Zhijian; Zhou, Yanchun
作者单位	1.China Univ Geosci, Sch Engn & Technol, Beijing 100083, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 3.Aerosp Res Inst Mat & Proc Technol, Sci & Technol Adv Funct Composite Lab, Beijing 100076, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Zifan,Xiang, Huimin,Chen, Heng,et al. High-entropy (Nd0.2Sm0.2Eu0.2Y0.2Yb0.2)(4)Al(2)O(9)with good high temperature stability, low thermal conductivity, and anisotropic thermal expansivity[J]. JOURNAL OF ADVANCED CERAMICS,2020,9(5):595-605.
APA	Zhao, Zifan.,Xiang, Huimin.,Chen, Heng.,Dai, Fu-Zhi.,Wang, Xiaohui.,...&Zhou, Yanchun.(2020).High-entropy (Nd0.2Sm0.2Eu0.2Y0.2Yb0.2)(4)Al(2)O(9)with good high temperature stability, low thermal conductivity, and anisotropic thermal expansivity.JOURNAL OF ADVANCED CERAMICS,9(5),595-605.
MLA	Zhao, Zifan,et al."High-entropy (Nd0.2Sm0.2Eu0.2Y0.2Yb0.2)(4)Al(2)O(9)with good high temperature stability, low thermal conductivity, and anisotropic thermal expansivity".JOURNAL OF ADVANCED CERAMICS 9.5(2020):595-605.