Effects of terbium sulfide addition on magnetic properties, microstructure and thermal stability of sintered Nd—Fe—B magnets

doi:10.1088/1674-1056/25/7/077502

Abstract To increase coercivity and thermal stability of sintered Nd-Fe-B magnets for high-temperature applications, a novel terbium sulfide powder is added into (Pr_0.25Nd_0.75)_30.6Cu_0.15Fe_balB₁ (wt.%) basic magnets. The effects of the addition of terbium sulfide on magnetic properties, microstructure, and thermal stability of sintered Nd-Fe-B magnets are investigated. The experimental results show that by adding 3 wt.% Tb₂S₃, the coercivity of the magnet is remarkably increased by about 54% without a considerable reduction in remanence and maximum energy product. By means of the electron probe microanalyzer (EPMA) technology, it is observed that Tb is mainly present in the outer region of 2:14:1 matrix grains and forms a well-developed Tb-shell phase, resulting in enhancement of H_A, which accounts for the coercivity enhancement. Moreover, compared with Tb₂S₃-free magnets, the reversible temperature coefficients of remanence (α) and coercivity (β) and the irreversible flux loss of magnetic flow (h_irr) values of Tb₂S₃-added magnets are improved, indicating that the thermal stability of the magnets is also effectively improved.

Keywords: terbium sulfide magnetic property microstructure thermal stability

Received: 02 January 2016
Revised: 14 March 2016
Accepted manuscript online:

PACS:	75.50.Ww	(Permanent magnets)
	75.50.Vv	(High coercivity materials)
	71.20.Eh	(Rare earth metals and alloys)

Fund: Project supported by the Science Funds from the Ministry of Science and Technology, China (Grant Nos. 2014DFB50130 and 2011CB612304) and the National Natural Science Foundation of China (Grant Nos. 51172168 and 51072139).

Corresponding Authors: Gao-Lin Yan
E-mail: gaolinyan@whu.edu.cn

Cite this article:

Xiang-Bin Li(李向斌), Shuo Liu(刘硕), Xue-Jing Cao(曹学静), Bei-Bei Zhou(周贝贝), Ling Chen(陈岭), A-Ru Yan(闫阿儒), Gao-Lin Yan(严高林) Effects of terbium sulfide addition on magnetic properties, microstructure and thermal stability of sintered Nd—Fe—B magnets 2016 Chin. Phys. B 25 077502

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Effects of terbium sulfide addition on magnetic properties, microstructure and thermal stability of sintered Nd—Fe—B magnets

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