Metal-bonded Sm sub 2 Fe sub 17 -N-type magnets

Journal Article · Fri Nov 15 00:00:00 EST 1991 · Journal of Applied Physics; (United States)

DOI:https://doi.org/10.1063/1.350082· OSTI ID:5161124

Huang, M Q; Zhang, L Y; Ma, B M; Zheng, Y; Elbicki, J M; Wallace, W E; Sankar, S G ^[1]

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1. The Advanced Materials Corporation, Pittsburgh, Pennsylvania (USA)

A number of metal-bonded Sm{sub 2}Fe{sub 17}-N magnets have been fabricated. These magnets exhibit {sub {ital i}H{ital c}} = 5.1--17.0 kOe, {ital B}{sub {ital r}} = 6.4--8.4 kG, (BH){sub max}=5.0--10.8 MGOe, {ital T}{sub {ital c}} = 757 K, and {rho}=6.2--6.7 g/cm{sup 3}. Powder metallurgical techniques have been employed with a mixture of powdered Sm{sub 2}Fe{sub 17}-N and Zn, Sn, or In. Heat treatment is carried out in the temperature range of 160--450 {degree}C in a N{sub 2} atmosphere at pressures ranging from 0--900 psi. The effects of Zn, Sn, and In contents and heat treatment conditions on the magnetic properties have been studied. Zn as the binder significantly enhances the coercivity {sub {ital i}H{ital c}} from 1.8--2.5 kOe for Zn-free magnets to 5--17 kOe for 9--20-wt. % Zn-containing magnets. The Fe-Zn phase, FeZn{sub 4}, and/or Fe{sub 3}Zn{sub 7}, formed during heat treatment, may play an important role in producing a high coercivity. Sn-bonded magnets exhibit significant coercivity, whereas the In-bonded materials do not. The coercivity behavior is discussed in terms of the chemistry of the system.

• OSTI ID: 5161124
• Journal Information: Journal of Applied Physics; (United States), Vol. 70:10; ISSN 0021-8979
• Country of Publication: United States
• Language: English

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