High-coercivity samarium-iron-nitrogen from nitriding melt-spun ribbons

Journal Article · Thu Apr 01 00:00:00 EST 1993 · Journal of Materials Engineering; (United States)

DOI:https://doi.org/10.1007/BF02660289· OSTI ID:6490816

Pinkerton, F E; Fuerst, C D ^[1]

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1. General Motors NAO Research and Development Center, Warren, MI (United States)

Melt spinning has proven to be an excellent technique for magnetic hardening of a variety of permanent magnet materials, especially Nd-Fe-B. Recently, a new permanent magnet material has been discovered by nitriding the compound Sm[sub 2]Fe[sub 17] to obtain Sm[sub 2]Fe[sub 17]N[sub x]. The authors have obtained magnetically hard Sm-Fe-N ribbons with a room-temperature intrinsic coercivity H[sub ci] = 22 kOe (1.8 MA/m) by nitriding melt-spun Sm-Fe precursor ribbons. Best results were obtained by grinding the ribbons to a <25 [mu]m powder, then heat treating the powder in vacuum for 1 h at 700 C prior to nitriding in N[sub 2] gas at 450 to 480 C. X-ray diffraction shows that the primary phase is TbCu[sub 7]-type Sm[sub 2]Fe[sub 17]N[sub x], a disordered hexagonal modification of the rhombohedral Sm[sub 2]Fe[sub 17] phase.

• OSTI ID: 6490816
• Journal Information: Journal of Materials Engineering; (United States), Vol. 2:2; ISSN 0931-7058
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
IRON ALLOYS
FABRICATION
MAGNETIC PROPERTIES
PERMANENT MAGNETS
SAMARIUM ALLOYS
COERCIVE FORCE
MAGNETIC MATERIALS
NITROGEN ADDITIONS
ALLOYS
MAGNETS
MATERIALS
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
360104* - Metals &amp; Alloys- Physical Properties
360101 - Metals &amp; Alloys- Preparation &amp; Fabrication