Cu-added Nd-Fe-B anisotropic powder for permanent magnet use

Journal Article · Mon Apr 15 00:00:00 EDT 1991 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.347841· OSTI ID:5813763

Sakamoto, H; Fujikura, M; Mukai, T ^[1]

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1. R D Laboratories-I, Nippon Steel Corporation, 1618 Ida, Nakaharaku, Kawasaki 211, Japan (JP)

A packed-rolling method has been applied to fabricating Nd-Fe-B anisotropic powder from melt-spun ribbons; the method involves packing the ribbon materials in a steel container under a vacuum and rolling the pack at around 700 {degree}C. The hot-rolled materials, which form a bulk in a plate-shape, exhibited a strong deformation-induced magnetic anisotropy with the easy magnetization axis parallel to the plate-thickness direction. The anisotropic powders can be obtained by pulverizing the hot-rolled materials. Hot rolling to an 82% reduction in ribbon thickness produced the following magnetic properties: {sub {ital i}H{ital c}} = 12.3 kOe, {ital B}{sub {ital r}} = 12.3 kG, and ({ital BH}){sub max} = 36.8 MGOe for a conventional Nd{sub 14}Fe{sub 80}B{sub 6} alloy. We have found that additions of Cu increase the coercive force up to 19 kOe and result in a remarkable improvement in thermal stability of the anisotropic powders. The result is interpreted in terms of the suppression of grain growth by Cu additions.

• OSTI ID: 5813763
• Journal Information: Journal of Applied Physics; (USA), Vol. 69:8; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BORON ALLOYS
MAGNETIC PROPERTIES
IRON ALLOYS
NEODYMIUM ALLOYS
PERMANENT MAGNETS
COERCIVE FORCE
FABRICATION
COPPER ADDITIONS
POWDERS
ALLOYS
COPPER ALLOYS
MAGNETS
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
360104* - Metals & Alloys- Physical Properties