Method for producing a rare earth metal-iron-boron permanent magnet by use of a rapidly-quenched alloy powder
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United States of America Patent
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Apr 30, 1991
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N/A
app pub date -
Nov 17, 1989
filing date -
Sep 16, 1986
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Abstract
A rare earth metal-iron-boron permanent magnet is produced by a 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 least one element selected from the group consisting of yttrium and rare earth metals and T is at least one element selected from the group consisting of transition metals. During sintering almost all the rapidly-quenched alloy powder melts to form a liquidus phase which cements the magnetic particles at a sintering temperature. The liquidus phase generates a magnetic crystalline phase and a 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 a 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 also has a reduced oxygen content.
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