Title :
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
fDate :
9/1/1990 12:00:00 AM
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;
Journal_Title :
Magnetics, IEEE Transactions on
