Title:
POWDER FOR MAGNET
Document Type and Number:
WIPO Patent Application WO/2011/129366
Kind Code:
A1
Abstract:
Provided are a powder for magnets which gives 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.
The powder for magnets is configured of magnetic particles (1) having a structure which comprises a phase (2) constituted of an iron-containing substance and, dispersed therein, grains of a phase (3) constituted of the hydride of a rare-earth element. The phase (2) constituted of an iron-containing substance is evenly present in each magnetic particle (1). This powder hence has excellent compactibility, and a powder compact (4) having a heightened density is easy to obtain therefrom. 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).
Inventors:
MAEDA, Toru (1-1, Koyakita 1-chome, Itami-sh, Hyogo 16, 〒6640016, JP)
前田 徹 (〒16 兵庫県伊丹市昆陽北一丁目１番１号 住友電気工業株式会社伊丹製作所内 Hyogo, 〒6640016, JP)
前田 徹 (〒16 兵庫県伊丹市昆陽北一丁目１番１号 住友電気工業株式会社伊丹製作所内 Hyogo, 〒6640016, JP)
Application Number:
JP2011/059183
Publication Date:
October 20, 2011
Filing Date:
April 13, 2011
Export Citation:
Assignee:
SUMITOMO ELECTRIC INDUSTRIES, LTD. (5-33, Kitahama 4-chome Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
住友電気工業株式会社 (〒41 大阪府大阪市中央区北浜四丁目５番３３号 Osaka, 〒5410041, JP)
MAEDA, Toru (1-1, Koyakita 1-chome, Itami-sh, Hyogo 16, 〒6640016, JP)
住友電気工業株式会社 (〒41 大阪府大阪市中央区北浜四丁目５番３３号 Osaka, 〒5410041, JP)
MAEDA, Toru (1-1, Koyakita 1-chome, Itami-sh, Hyogo 16, 〒6640016, JP)
International Classes:
B22F1/00; B22F3/00; B22F3/02; B22F3/10; C22C33/02; H01F1/053; H01F1/06; H01F1/08; H01F41/02
Attorney, Agent or Firm:
YAMANO, Hiroshi (KEIMEI PATENT OFFICE, 10F ASTRO Shin Osaka 2 Bldg., 1-3, Nishinakajima 6-chome, Yodogawa-ku, Osaka-sh, Osaka 11, 〒5320011, JP)
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Claims: