Influence of misch metal content on microstructure and magnetic properties of R-Fe-B magnets sintered by dual alloy method

doi:10.1088/1674-1056/26/5/057502

Abstract

MM₁₄Fe_79.9B_6.1/Nd_13.5Fe_80.5B₆ magnets were fabricated by dual alloy method (MM, misch metal). Some magnets have two Curie temperatures. Curie temperatures T_c1 corresponds to the main phase which contains more LaCe, and T_c1 decreases from 276.5 ℃ to 256.6 ℃ with the content of MM increasing from 30.3 at.% to 50.6 at.%. The variation of B_r with the increase of MM indicates the existence of inter-grain exchange coupling in the magnets. When MM/R ≤ 30.3 at.%, the magnetic properties can reach the level of the intrinsic coercivity H_cj ≥ 7.11 kOe and the maximum energy product (BH)_max ≥ 41 MGOe. Compared with Nd, La and Ce are easier to diffuse to the grain boundaries in the sintering process, and this will cause the decrease of H_cj. Due to the diffusion between the grains, the atomic ratio of La, Ce, Pr, and Nd in each grain is different and the percentage of Nd in all grains is higher than that in misch metal.

Keywords: misch metal multiple-main-phase grain permanent magnet

Received: 20 February 2017
Revised: 07 March 2017
Accepted manuscript online:

PACS:	75.50.Vv	(High coercivity materials)
	75.50.Ww	(Permanent magnets)

Fund:

Project supported by the National Key Research and Development Program of China (Grant Nos. 2014CB643702 and 2016YFB0700903), the National Natural Science Foundation of China (Grant No. 51590880), and the Knowledge Innovation Project of the Chinese Academy of Sciences (Grant No. KJZD-EW-M05).

Corresponding Authors: Bao-Gen Shen
E-mail: shenbg@aphy.iphy.ac.cn

Cite this article:

Rong-Xiang Shang(商荣翔), Jie-Fu Xiong(熊杰夫), Dan Liu(刘丹), Shu-Lan Zuo(左淑兰), Xin Zhao(赵鑫), Rui Li(李锐), Wen-Liang Zuo(左文亮), Tong-Yun Zhao(赵同云), Ren-Jie Chen(陈仁杰), Ji-Rong Sun(孙继荣), Bao-Gen Shen(沈保根) Influence of misch metal content on microstructure and magnetic properties of R-Fe-B magnets sintered by dual alloy method 2017 Chin. Phys. B 26 057502

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Influence of misch metal content on microstructure and magnetic properties of R-Fe-B magnets sintered by dual alloy method

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