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Improved thermal stability and infrared emissivity of high-entropy REMgAl11O19 and LaMAl11O19 (RE = La, Nd, Gd, Sm, Pr, Dy; M = Mg, Fe, Co, Ni, Zn)
Zhu, Haolin1,2,3; Liu, Ling1,3,4; Xiang, Huimin2; Dai, Fu-Zhi2; Wang, Xiaohui5; Ma, Zhuang1,3,4; Liu, Yanbo1,3,4; Zhou, Yanchun2
Corresponding AuthorLiu, Ling(richard@bit.edu.cn) ; Zhou, Yanchun(yczhou@alum.imr.ac.cn)
2022-03-30
Source PublicationJOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN1005-0302
Volume104Pages:131-144
AbstractLaMgAl11O19 (LMA), characterized by high melting point, low density and thermal conductivity as well as good infrared emissivity, is regarded as a potential candidate for the thermal protection of hypersonic vehicles. Nevertheless, the unsatisfied phase stability at high temperature results in declining of the emissivity below 6 mu m, which limits the extensive applications of LaMgAl11O19. In order to overcome this obstacle, three dense bulk high-entropy ceramics, (La0.2Nd0.2Gd0.2Sm0.2Pr0.2)MgAl11O19 (HE LMA-1), (La0.2Nd0.2Gd0.2Sm0.2Dy0.2)Mg Al11O19 (HE LMA-2) and La(Mg0.2Fe0.2Co0.2Ni0.2Zn0.2)Al11O19 (HE LMA-3), were designed and successfully prepared through solid state reaction at 1700 degrees C for 4 h in one step. XRD analyses show that the phase compositions of HE LMA-1, HE LMA-2 and HE LMA-3 are single-phase solid solutions with the relative density of 95.61%, 95.49% and 94.31%, respectively. Heat treatment experiments demonstrate that the phase composition of HE LMA-1 remains a single phase after high-temperature heating, while second phase appears in other two samples. The stability of HE LMA-1 is attributed to small average size difference delta (similar to 4%) of constitute elements. Intriguingly, the average emissivity of HE LMA-1 in the range of 3-6 mu m reaches 0.9, which is significantly higher than that of LMA and other two HE LMA samples. The emissivity of all samples remains above 0.95 from 6 to 10 mu m. In the far infrared region (10-14 mu m), although the emissivity of these specimens decreases slightly, it still exceeds 0.85. The UV-Vis absorption spectra indicate that the formation of many discrete impurity energy levels with small intervals in HE LMA-1 promotes the f electrons to transit between adjacent impurity energy levels and conduction band, which enhances the infrared emission of HE LMA-1 below 6 mu m. In a word, with improved phase stability and thermal emissivity in infrared range, high-entropy REMgAl11O19, especially (La0.2Nd0.2Gd0.2Sm0.2Pr0.2)MgAl11O19 (HE LMA-1), is a promising candidate in thermal protection coatings of hypersonic vehicles. (C) 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
KeywordHigh-entropy ceramics LaMgAl11O19 Thermal stability Infrared emissivity UV-Vis absorption
Funding OrganizationNational Natural Science Foun-dation of China
DOI10.1016/j.jmst.2021.06.068
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foun-dation of China[51772027] ; National Natural Science Foun-dation of China[51972089]
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000773043300006
PublisherJOURNAL MATER SCI TECHNOL
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/172994
Collection中国科学院金属研究所
Corresponding AuthorLiu, Ling; Zhou, Yanchun
Affiliation1.Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
2.Aerosp Res Inst Mat & Proc Technol, Sci & Technol Adv Funct Composite Lab, Beijing 100076, Peoples R China
3.Natl Key Lab Sci & Technol Mat Shock & Impact, Beijing 100081, Peoples R China
4.Beijing Inst Technol Chongqing Innovat Ctr, Chongqing 401120, Peoples R China
5.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Zhu, Haolin,Liu, Ling,Xiang, Huimin,et al. Improved thermal stability and infrared emissivity of high-entropy REMgAl11O19 and LaMAl11O19 (RE = La, Nd, Gd, Sm, Pr, Dy; M = Mg, Fe, Co, Ni, Zn)[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2022,104:131-144.
APA Zhu, Haolin.,Liu, Ling.,Xiang, Huimin.,Dai, Fu-Zhi.,Wang, Xiaohui.,...&Zhou, Yanchun.(2022).Improved thermal stability and infrared emissivity of high-entropy REMgAl11O19 and LaMAl11O19 (RE = La, Nd, Gd, Sm, Pr, Dy; M = Mg, Fe, Co, Ni, Zn).JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,104,131-144.
MLA Zhu, Haolin,et al."Improved thermal stability and infrared emissivity of high-entropy REMgAl11O19 and LaMAl11O19 (RE = La, Nd, Gd, Sm, Pr, Dy; M = Mg, Fe, Co, Ni, Zn)".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 104(2022):131-144.
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