Improved corrosion resistance and magnetic properties of Nd-Fe-B-type sintered magnets with Mo and Co

Journal Article · Mon Apr 15 04:00:00 EDT 1991 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.347845· OSTI ID:5811097

Hirosawa, S; Mino, S; Tomizawa, H ^[1]

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1. Sumitomo Special Metals Co., Ltd., 2-15-17 Egawa, Shimamotocho, Mishimagun, Osaka 618, Japan (JP)

A few atomic percent addition of Mo considerably improves the intrinsic coercivity ({ital H}{sub {ital cJ}}) of Nd-Dy-Fe-Co-B sintered magnets if the Mo content is optimized against B content. It is shown that upgrading of the magnet can be realized by decreasing both Mo and B contents, keeping the optimum Mo-B relation. Dependence of corrosion resistance of both uncoated and aluminum-coated magnets on Co and Nd contents are studied and significant improvement of the corrosion resistance is attributed to formation of an Nd-Co compound, probably Nd{sub 3}Co.

• OSTI ID: 5811097
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 69:8; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALLOYS
BORIDES
BORON COMPOUNDS
COBALT BORIDES
COBALT COMPOUNDS
COERCIVE FORCE
CORROSION RESISTANCE
CRYSTAL STRUCTURE
FABRICATION
GRAIN BOUNDARIES
IRON BORIDES
IRON COMPOUNDS
MAGNETIC PROPERTIES
MAGNETS
METALLURGY
MICROSTRUCTURE
MOLYBDENUM ADDITIONS
MOLYBDENUM ALLOYS
NEODYMIUM BORIDES
NEODYMIUM COMPOUNDS
OPTIMIZATION
PHYSICAL PROPERTIES
POWDER METALLURGY
RARE EARTH COMPOUNDS
SINTERING
STABILITY
TRANSITION ELEMENT COMPOUNDS