Recent Development for Preparation Processes of Sm2Fe17N x Powders with High Magnetic Properties

被引：0

作者：

He Y. ^{[1
]}

Li C. ^{[1
]}

Chen X. ^{[1
]}

Long Z. ^{[1
]}

Lai J. ^{[1
]}

Shao B. ^{[1
,2
]}

Ma Y. ^{[1
,2
]}

Chen D. ^{[1
,2
]}

Dong J. ^{[1
,2
]}

机构：

[1] School of Metallurgy and Material Engineering, Chongqing University of Science and Technology, Chongqing

[2] Chongqing Key Laboratory of Nano-Micro Composites and Devices, Chongqing

来源：

Cailiao Yanjiu Xuebao/Chinese Journal of Materials Research | 2022年 / 36卷 / 05期

关键词：

Magnetic properties; Metallic material; Preparation methods; Review; Sm[!sub]2[!/sub]Fe[!sub]17[!/sub]N [!sub]x[!/sub;

D O I：

10.11901/1005.3093.2021.279

中图分类号：

学科分类号：

摘要：

The rapid development of new energy vehicles requires permanent magnet materials that can work stably in the temperature range of 120℃~200℃. Sm2Fe17N3 with Curie temperature of 476℃ and anisotropic field of 14.7 T has excellent intrinsic magnetic properties, and can be used in this temperature range. In order to improve the magnetic properties of Sm2Fe17N3 powder, the particle size of which should be reduced to the critical size close to a single domain, so that to gain high anisotropic field; Meanwhile, surface oxidation caused by particle size reduction should be avoided to ensure high remanence magnetism and maximum magnetic energy product. High performance Sm2Fe17N3 can be prepared by powder crushing, mechanical alloying, strip casting, thin strip continuous casting, reduction diffusion and surface plating. At the present, the coercivity and maximum magnetic energy product of Sm2Fe17N3 powder prepared in laboratory have reached 28.1 kOe and 43.6 MGOe respectively. In this paper, the research results on the preparation of Sm2Fe17N3 powders in recent years are reviewed, including preparation methods and the relevant mechanism, and key problems that remain to be solved, namely the relation of the coercivity and remanence of Sm2Fe17N3 powder with the particle size, as well as with the particle magnetic domain structure;the mechanism related with the enhanced effect H2 within the gas mixture NH3/H2 on the nitriding efficiency of the powder still needs to be revealed; further the secondary crushing technique in low oxygen pressures, which can prepare particles with uniform distribution of particle size, while adjust their morphology, remains to be developed; for the present reduction diffusion method, new precursors, and their preparation methods suitable for massive production, and water washing technology for rapid removal of calcium by-products were also needed to develop. © 2022, Editorial Office of Chinese Journal of Materials Research. All right reserved.

引用

页码：321 / 331

页数：10

共 68 条

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