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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, Zifan1,2; Xiang, Huimin1; Chen, Heng1; Dai, Fu-Zhi1; Wang, Xiaohui3; Peng, Zhijian2; Zhou, Yanchun1
Corresponding AuthorPeng, Zhijian(pengzhijian@cugb.edu.cn) ; Zhou, Yanchun(yczhou@alum.imr.ac.cn)
2020-10-01
Source PublicationJOURNAL OF ADVANCED CERAMICS
ISSN2226-4108
Volume9Issue:5Pages:595-605
AbstractThe 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.
Keyword(Nd0 2Sm0 2Eu0 2Y0 2Y0 2) high-entropy ceramics (HECs) environmental barrier coatings phase stability thermal properties
DOI10.1007/s40145-020-0399-0
Indexed BySCI
Language英语
WOS Research AreaMaterials Science
WOS SubjectMaterials Science, Ceramics
WOS IDWOS:000576572000008
PublisherSPRINGER
Citation statistics
Cited Times:11[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/140836
Collection中国科学院金属研究所
Corresponding AuthorPeng, Zhijian; Zhou, Yanchun
Affiliation1.Aerosp Res Inst Mat & Proc Technol, Sci & Technol Adv Funct Composite Lab, Beijing 100076, Peoples R China
2.China Univ Geosci, Sch Engn & Technol, Beijing 100083, Peoples R China
3.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
Recommended Citation
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.
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