POWDER FOR MAGNET

摘要

The present invention provides a powder for a magnet which can form a rare earth magnet having excellent magnetic characteristics and which has excellent moldability, a method for producing the powder for a magnet, a powder compact, and a rare earth-iron-boron-based alloy material.;Magnetic particles constituting a powder for a magnet each include a structure in which a particle of a phase 3 of a hydrogen compound of a rare earth element is dispersed in a phase 2 of an iron-containing material. Since the phase 2 of the iron-containing material is uniformly present in each of the magnetic particles 1, the powder has excellent moldability and easily increases the density of a powder compact 4. The powder for a magnet can be produced by heat-treating a powder of a rare earth-iron-boron-based alloy (R—Fe—B-based alloy) in a hydrogen atmosphere at a temperature equal to or higher than the disproportionation temperature of the R—Fe—B-based alloy to separate the powder into the rare earth element and the iron-containing material and to produce the hydrogen compound of the rare earth element. The powder compact 4 is produced by compacting the powder for a magnet. The powder compact 4 is heat-treated in a vacuum to produce a R—Fe—B-based alloy material 5, and the R—Fe—B-based alloy 5 is magnetized to produce a R—Fe—B-based alloy magnet 6.

主权项

1. A powder for a magnet used for a rare earth magnet,
wherein each of magnetic particles constituting the powder for a magnet is composed of less than 40% by volume of a hydrogen compound of a rare earth element, and the balance composed of an iron-containing material; the iron-containing material contains iron and an iron-boron alloy containing iron and boron; a phase of the hydrogen compound of a rare earth element and a phase of the iron-containing material are present adjacent to each other; and the distance between the phases of the rare earth element hydrogen compound adjacent to each other with the phase of the iron-containing material interposed therebetween is 3 μm or less.