Title :
The temperature stability of NdFeB and NdFeBCo magnets
Author :
Clegg, A.G. ; Coulson, I.M. ; Hilton, G. ; Wong, H.Y.
Author_Institution :
Sch. of Electr. Eng. & Appl. Phys., Sunderland Polytech., UK
fDate :
9/1/1990 12:00:00 AM
Abstract :
A range of materials including sintered low and high coercivity ternary (NdFeB) and quarternary (NdFeBCo) magnet alloys and bonded Magnequench (MQI) was investigated. The effects of temperature including irreversible and reversible changes of magnetization are discussed. Magnets with two different working points were investigated. Temperature effects as a function of time were determined for magnets held at 100°C for up to 200 h. It was found that the higher the coercivity and loop-squareness, the better the temperature stability of the magnet. The highest coercivity material investigated was produced by using hydrogen decrepitation of the magnet powder
Keywords :
boron alloys; cobalt alloys; coercive force; ferromagnetic properties of substances; iron alloys; magnetisation; neodymium alloys; permanent magnets; 100 C; 150 C; 200 h; 60 C; H decrepitation; NdFeB magnets; NdFeBCo magnets; bonded Magnequench; coercivity; flux loss; magnet powder; magnetization; permanent magnets; quarternary magnet alloys; sintering; temperature effects; temperature stability; ternary magnet alloys; Bonding; Coercive force; Magnetic domains; Magnetic flux; Magnetic materials; Magnetization; Magnets; Neodymium; Stability; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
