Magnetic powder, permanent magnet produced therefrom and process

Details Magnetic powder, permanent magnet produced therefrom and process Magnetic powder, permanent magnet produced therefrom and process

1997-04-25

2000-10-31

Sheehan, John

Compositions

Magnetic

Free metal or alloy containing

252 6254, 148301, 148302, 148104, 75252, 75254, 75255, 419 12, 419 13, 419 14, H01F 104, H01F 114

Patent

active

061397652

ABSTRACT:
A magnetic powder and a permanent magnet are provided which have magnetic properties enhanced by magnetic interaction. Disclosed are a magnetic powder comprising a mixture of two or more powders including a magnetic powder A (residual magnetic flux density: BrA, coercive force: HcA) and a magnetic powder B (residual magnetic flux density: BrB, coercive force: HcB) of which the residual magnetic flux densities and the coercive forces have the following relationships: BrA>BrB and HcA<HcB, and a bonded magnet or a sintered magnet produced from the magnetic powder, and a method for mixing magnetic powders and a process for producing a magnet.

REFERENCES:
patent: 4601754 (1986-07-01), Ghandehari
patent: 5281250 (1994-01-01), Hamamura et al.
"Partial Substitution of Sm With Neodymium in RE.sub.2 (TM).sub.17 Resin Bonded Magnets," Journal of Magnetics Society of Japan, vol. 11, No. 2, pp. 243-246 (1987).
"Partial Substitution of Sm With Praseodymium in R.sub.2 (TM).sub.17 Resin Bonded Magnets," Journal of Japan Society of Powder and Powder Metallurgy, vol. 35, No. 7, pp. 584-588 (1988).
"Intrinsic magnetic properties of R.sub.2 Fe.sub.17 C.sub.y N.sub.x compounds: (R=Y, Sm, Er, and Tm)", J. Appl. Phys. 70(4), pp. 2272-2282 (1991).
"Effect of Nitrogen Content on Magnetic Properties of Sm.sub.2 Fe.sub.17 N.sub.x (0<x<6)", IEEE Transactions on Magnetics, vol. 8, No. 5, pp. 2326-2331 (1992).
R. Skomski et al., "Giant Energy Product in Nanostructured Two-phase Magnets," Physical Review B: Condensed Matter, vol. 48, No. 21, pp. 15812-15816 (1993).

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