Metal-bonded Sm sub 2 Fe sub 17 -N-type magnets
- 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), Journal Name: Journal of Applied Physics; (United States) Vol. 70:10; ISSN 0021-8979; ISSN JAPIA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Anisotropic sintered Sm{sub 2}(Fe,M){sub 17}N{sub x} magnets made by rotational alignment
Sm{sub 2}Fe{sub 17} interstitial magnets (invited)
Related Subjects
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
CHEMICAL REACTIONS
COERCIVE FORCE
FABRICATION
HEAT TREATMENTS
HIGH TEMPERATURE
IRON COMPOUNDS
IRON NITRIDES
MAGNETS
NITRIDATION
NITRIDES
NITROGEN COMPOUNDS
PERMANENT MAGNETS
PNICTIDES
RARE EARTH COMPOUNDS
SAMARIUM COMPOUNDS
SAMARIUM NITRIDES
TRANSITION ELEMENT COMPOUNDS