| 简介 |
PROBLEM TO BE SOLVED : To provide powder for a magnet, which can be used for the production of a rare earth magnet having excellent magnet properties and has excellent moldability, and to provide a process for producing the powder, a powder molded article, a rare earth-iron-based alloy material, a rare earth-iron-nitrogen-based alloy material which can be used as raw material for the magnet, and processes for producing the powder and the alloy materials.
SOLUTION : Each of magnetic particles 1 that constitute the powder for a magnet has such a structure that particles of a phase 3 of a hydrogen compound of a rare earth element are dispersed in a phase 2 of an iron-containing material such as Fe. In the powder, the phase 2 of the iron-containing material is present in each of the magnetic particles 1 homogeneously. The powder therefore has excellent moldability and achieves the production of a powder molded article 4 having a high relative density. The powder for a magnet is produced by heating a rare earth-iron-based alloy powder in a hydrogen atmosphere to separate a rare earth element and an iron-containing material from each other and producing a hydrogen compound of the rare earth element. The powder molded article 4 is produced by press-molding the powder for a magnet, and a rare earth-iron-based alloy material 5 is produced by heating the powder molded material 4 under a reduced pressure. A rare earth-iron-nitrogen-based alloy material 6 is produced by heating the rare earth-iron-based alloy material 5 in a nitrogen atmosphere.
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