| 简介 |
PROBLEM TO BE SOLVED : To provide a powder for magnets, which give a rare-earth magnet having excellent magnetic properties and which has excellent compactibility, a process for producing the powder, a powder compact, and a rare-earth/iron/boron alloy material.
SOLUTION : The powder for magnets is configured of magnetic particles 1 having a structure where grains of a phase 3 constituted of the hydride of a rare-earth element are dispersedly present in a phase 2 constituted of an iron-containing substance. The phase 2 constituted of an iron-containing substance is evenly present in each magnetic particle 1. This powder hence has excellent compactibility, and density of a powder compact 4 can be easily heightened. The powder for magnets is obtained by subjecting a powder of a rare-earth iron/boron alloy (R-Fe-B alloy) to heat treatment in a hydrogen atmosphere at a temperature not lower than the disproportionation temperature of the R-Fe-B alloy to thereby separate the rare-earth element and an iron-containing substance and yield the hydride of the rare-earth element. This powder for magnets is compacted to obtain a powder compact 4. The powder compact 4 is heat-treated under vacuum to obtain an R-Fe-B alloy material 5. The R-Fe-B alloy material 5 is magnetized to obtain an R-Fe-B alloy magnet 6.
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