Coercive force Co added Nd-Fe-B based powders prepared by crushing sintered magnets

Journal Article · Sat Sep 01 04:00:00 EDT 1990 · IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (USA)

DOI:https://doi.org/10.1109/20.104816· OSTI ID:5963144

Sakai, I; Tsutai, A; Sahashi, M; Inomata, K ^[1]

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1. Toshiba Corp., Kawasaki, Kanagawa (Japan). Research and Development Center

An anisotropic resin-bonded magnet was prepared by crushing sintered Nd-Fe-B magnets with Co-Al or Co-Ga. The authors have obtained the following magnetic properties for the composition of Nd{sub 14.5}Fe{sub 63}Co{sub 16}Ga{sub 1}B{sub 5.5} : (BH)max = 114 kJ/M{sup 3}, Br = 0.89 T and iHc = 810 kA/m. Especially, Co addition plays a significant role in improving the magnetic properties of the crushed powder. The surface layer damaged by crushing become thinner in the Co containing powder. In the Co added sintered magnets, the main crack brought about by Vickers indentation is comparatively easy to propogate through the grain boundaries and microcrack branchings is scarcely observed. These mechanical properties are closely related to the thickness of the damaged surface layer. Al or Ga addition to the Nd-Fe-Co-B system is very effective for obtaining a high coercive force of the powder.

• OSTI ID: 5963144
• 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) 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
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALLOYS
BONDING
BORIDES
BORON COMPOUNDS
COBALT ADDITIONS
COBALT ALLOYS
COERCIVE FORCE
COMMINUTION
CRUSHING
FABRICATION
IRON BORIDES
IRON COMPOUNDS
JOINING
MAGNETIC PROPERTIES
MAGNETS
MECHANICAL PROPERTIES
NEODYMIUM BORIDES
NEODYMIUM COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PHYSICAL PROPERTIES
POLYMERS
RARE EARTH COMPOUNDS
RESINS
SINTERING
TRANSITION ELEMENT COMPOUNDS