Method for producing a rare earth metal-iron-boron permanent mag

Details Method for producing a rare earth metal-iron-boron permanent mag Method for producing a rare earth metal-iron-boron permanent mag

1989-04-11

1990-02-06

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148104, 419 12, 419 32, 419 33, 419 38, 419 47, H01F 102

Patent

active

048986259

ABSTRACT:
A rare earth metal-iron-boron permanent magnet is produced by the sintering method using a magnetic powder prepared from an ingot of R.sub.2 Fe.sub.14 B and another powder prepared from a rapidly-quenched alloy ribbon of R-T-B. R is at least one selected from yttrium and rare earth metals and T is at least one selected from transition metals. The rapidly-quenched alloy powder almost all melts to form a liquidus phase which cements the magnetic particles at a sintering temperature. The liquidus phase generates a magnetic crystalline phase and the solid solution phase upon cooling from the sintering temperature. A comparatively large amount of rapidly-quenched alloy powder is used to produce a magnet having a reduced amount of solid solution phase. In addition to this, the rapidly-quenched alloy can readily be finely ground and the rapidly-quenched alloy powder can therefore be uniformly mixed with the magnetic alloy powder so that the magnet having excellent magnetic properties can be produced wherein the magnetic particles are uniformly dispersed in the small amount of the solid solution phase. The magnet has a reduced oxygen content.

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