Magnetic properties of sintered permanent magnets R-Fe-Cu-B (R = Pr, Nd)

Journal Article · Sat Sep 01 00:00:00 EDT 1990 · IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (USA)

DOI:https://doi.org/10.1109/20.104813· OSTI ID:5876861

Lin, C H; Chen, C J; ESu, C D; Chang, W C ^[1]; Chen, S K; Chin, T S ^[2]

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1. Materials Research Lab., Industrial Technical Research Inst., Hsinchu 310015 (TW)
2. Dept. of Materials Science and Engineering, National Tsing Hua Univ., Hsinchu 30043 (TW)

Radially anisotropic Pr{sub 15}Fe{sub 77.5}Cu{sub 1.5}B{sub 6} permanent magnets have been prepared from hydrogen decrepitated (HD) powders by conventional powder metallurgy processes. The best magnetic properties obtained along the radial directions are as follows: (BH)max = 10.5 MGOe, Br = 7.5 kG, and iHc = 8.5 kOe. Since Pr{sub 2}(Fe,Cu){sub 14}BH{sub x} exhibits planar anisotropy, the tetragonal c-axis of the HD powders should lie in the plane perpendicular to the field direction during alignment compaction. This style of radial alignment is not changed in the subsequent dehydrogenation and sintering processes. The easy direction of magnetization of the magnet can be changed by alloy design, switching from radial directions to the field direction with the addition of 33 wt% or more of Nd-Fe- B. Further addition of Nd-Fe-B monotonically increases both Br and (BH)max. For the Nd-Fe-Cu-B system, a small concentration of 1.5 at% Cu dramatically deteriorates the magnetic properties of the sintered magnet due to the extensive precipitation of free iron.

• OSTI ID: 5876861
• Journal Information: IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (USA), Journal Name: IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (USA) Journal Issue: 5 Vol. 26:5; ISSN IEMGA; ISSN 0018-9464
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ANISOTROPY
BORIDES
BORON COMPOUNDS
CHEMICAL COMPOSITION
COPPER BORIDES
COPPER COMPOUNDS
FABRICATION
IRON BORIDES
IRON COMPOUNDS
MAGNETIC PROPERTIES
MAGNETS
NEODYMIUM BORIDES
NEODYMIUM COMPOUNDS
PERMANENT MAGNETS
PHYSICAL PROPERTIES
PRASEODYMIUM BORIDES
PRASEODYMIUM COMPOUNDS
RARE EARTH COMPOUNDS
SINTERING
TRANSITION ELEMENT COMPOUNDS