Title :
The role of oxygen for improving magnetic properties and thermal stability of sintered (Nd,Dy)(Fe,Co)B magnets
Author :
Kim, A.S. ; Camp, F.E.
Author_Institution :
Crucible Res. Centre, Crucible Mater. Corp., Pittsburgh, PA, USA
fDate :
11/1/1995 12:00:00 AM
Abstract :
Oxygen has traditionally been thought of as being detrimental to rare earth permanent magnet properties, even though it was shown to increase the corrosion resistance of NdFeB magnets. In this study, we have systematically investigated the effect of oxygen on the magnetic properties of various types of NdFeB magnets. The addition of appropriate amounts of oxygen to a NdDyFeB magnet system containing cobalt causes increases in the remanence and intrinsic coercivity. The temperature coefficient of coercivity and irreversible temperature losses are also improved (reduced). In alloy systems not containing cobalt, oxygen doping causes a reduction in intrinsic coercivity
Keywords :
boron alloys; cobalt alloys; coercive force; dysprosium alloys; ferromagnetic materials; iron alloys; local moments; neodymium alloys; oxygen; permanent magnets; remanence; thermal stability; (Nd,Dy)(Fe,Co)B magnets; NdDyFeCoB:O; O doping; coercivity; corrosion resistance; irreversible temperature losses; remanence; thermal stability; Coercive force; Demagnetization; Doping; Human computer interaction; Magnetic properties; Magnets; Oxygen; Powders; Remanence; Thermal stability;
Journal_Title :
Magnetics, IEEE Transactions on
