Resin-bonded rare earth-iron-boron magnet

Details Resin-bonded rare earth-iron-boron magnet Resin-bonded rare earth-iron-boron magnet

1989-01-06

1990-12-04

Sheehan, John P.

Compositions

Magnetic

With wax, bitumen, resin, or gum

252 6254, 148302, 420 83, 420121, C04B 3564

Patent

active

049752138

ABSTRACT:
In a method for producing a resin-bonded rare earth-iron-boron magnet, a powder is subjected to a heat-treatment below its melting point. The powder can be either: (1) a mixture of both: (a) a powder of a rare earth-iron-boron magnetic alloy comprising about 8 to about 30 atomic percent of R, which stands for at least one selected from the group of Y (yttrium) and rare earth elements, about 2 to about 28 atomic precent of B(boron), and at least 50 atomic percent of Fe(iron) and (b) at least one of the group consisting of R, R-oxides, which are oxides of R, and R-compound, which are the compounds consisting essentially of more than 30 atomic percent of R and the balance substantially of at least one of Fe and Co; or (2) a rare earth-iron-boron magnetic alloy comprising about 8 to about 30 atomic percent of R, about 2 to about 28 atomic percent of B, about 0.1 to about 13 atomic percent of Ga, and at least 50 atomic percent of Fe. The resultant heat-treatment powder is then bonded with a resin. The present invention also includes a magnet such as might be made by such a method.

REFERENCES:
patent: 4836868 (1989-06-01), Yajima et al.
patent: 4842656 (1989-06-01), Maines et al.
Materials Letters, vol. 4, No. 5.6.7, Jul. 1986, pp. 304 to 306.
IEEE Transactions on Magnetics, vol. Mag-23, No. 5, Sep. 1987, pp. 2512-2514.

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