High-coercivity Nd-Fe-B-type permanent magnets with less dysprosium

Author

Hirosawa, Satoshi ; Tomizawa, Hiroyuki ; Mino, Shuji ; Hamamura, Atsushi

Author_Institution

Sumitomo Special Metals Co. Ltd., Osaka, Japan

Volume

26

Issue

5

fYear

1990

fDate

9/1/1990 12:00:00 AM

Firstpage

1960

Lastpage

1962

Abstract

The effects of V or Mo addition on the microstructure and magnetic properties of Nd-Dy-Fe-Co-B sintered magnets were studied experimentally. It is shown that these additives increase the intrinsic coercivity of cobalt-containing Nd-Fe-B-type sintered magnets, serving to reduce the amount of Dy required for thermal stability. Corrosion resistance in a humid atmosphere is also improved by these elements. It is concluded that V or Mo addition in sintered magnets make it possible to achieve the thermal stability and corrosion resistance required in applications which encounter high-temperature and high-humidity environments and in which a high remanence is of secondary importance

Keywords

boron alloys; cobalt alloys; coercive force; corrosion; dysprosium alloys; ferromagnetic properties of substances; grain boundaries; grain size; iron alloys; molybdenum alloys; neodymium alloys; permanent magnets; sintering; vanadium alloys; NdDyFeCoBMo magnets; NdDyFeCoBV sintered magnets; corrosion resistance; grain boundary; grain size; high coercivity permanent magnets; humid atmosphere; intrinsic coercivity; optical Kerr micrographs; permanent magnets; thermal stability; Additives; Atmosphere; Coercive force; Corrosion; Magnetic properties; Microstructure; Permanent magnets; Remanence; Thermal resistance; Thermal stability;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.104582

Filename

104582