Magnetically anisotropic bond magnet, magnetic powder for the ma

Details Magnetically anisotropic bond magnet, magnetic powder for the ma Magnetically anisotropic bond magnet, magnetic powder for the ma

1989-12-04

1992-02-04

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

75349, 75352, 75356, 75357, H01F 102

Patent

active

050857150

ABSTRACT:
A process for producing magnetically anisotropic powder having "flattened" crystal grains of an R-TM-B-M system alloy with preferably (c)/(a) greater than 2, where (c) is the grain size perpendicular to the C-axis and (a) the grain size parallel to the C-axis, includes the steps of plastically deforming a green compact of flakes formed by rapidly-quenching the alloy melt, and then crushing the plastically deformed body. In the alloy system, R is at least one of the rare earth elements including Y, TM is Fe or Fe a part of which has been substituted with Co, B is boron, and M is an additive selected from Si, Al, Nb, Zr, P and C.

REFERENCES:
patent: 4192696 (1980-03-01), Menth et al.
patent: 4402770 (1983-09-01), Koon
patent: 4597938 (1986-07-01), Matsuura et al.
patent: 4601875 (1986-09-01), Yamamoto et al.
K. Gudimetta et al, "Magnetic Properties Fe-R-B Powders": Appl. Phys. Lett. 48(10), 10 Mar. 1986, pp. 670-672.

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