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)
文献类型：期刊论文
| 作者 | Zhu, Haolin2,3,4; Liu, Ling1,2,4; Xiang, Huimin3; Dai, Fu-Zhi3; Wang, Xiaohui5; Ma, Zhuang1,2,4; Liu, Yanbo1,2,4; Zhou, Yanchun3 |
| 刊名 | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
 |
| 出版日期 | 2022-03-30 |
| 卷号 | 104页码:131-144 |
| ISSN号 | 1005-0302 |
| 关键词 | High-entropy ceramics LaMgAl11O19 Thermal stability Infrared emissivity UV-Vis absorption |
| DOI | 10.1016/j.jmst.2021.06.068 |
| 通讯作者 | Liu, Ling(richard@bit.edu.cn) ; Zhou, Yanchun(yczhou@alum.imr.ac.cn) |
| 英文摘要 | LaMgAl11O19 (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. |
| 资助项目 | National Natural Science Foun-dation of China[51772027] ; National Natural Science Foun-dation of China[51972089] |
| WOS研究方向 | Materials Science ; Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| 出版者 | JOURNAL MATER SCI TECHNOL |
| WOS记录号 | WOS:000773043300006 |
| 资助机构 | National Natural Science Foun-dation of China |
| 源URL | [http://ir.imr.ac.cn/handle/321006/172993]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 通讯作者 | Liu, Ling; Zhou, Yanchun |
| 作者单位 | 1.Beijing Inst Technol Chongqing Innovat Ctr, Chongqing 401120, Peoples R China 2.Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China 3.Aerosp Res Inst Mat & Proc Technol, Sci & Technol Adv Funct Composite Lab, Beijing 100076, Peoples R China 4.Natl Key Lab Sci & Technol Mat Shock & Impact, Beijing 100081, Peoples R China 5.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：金属研究所
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