Title:
希土類磁石の製造法、希土類磁石用原料合金及び粉末
Document Type and Number:
Japanese Patent JP4133315
Kind Code:
B2
Abstract:
To provide a method for manufacturing rare-earth magnet by which the rare earth magnet of high magnetic characteristic is supplied easily and stably and an end material amount generated in the case of working a magnet is reduced, by improving the oxidation and yield of R component so as to expand a sintering temperature area in a method using a single alloy, and to provide alloy and powder useful for the method.
The method for manufacturing comprises a process for preparing a material alloy (A) and a raw material (B). The material alloy (A) has the specific composition of R-B-M. In the material alloy (A), an R2Fe14B phase is a main phase and is 77 vol.%, an R-rich phase is 15 to 23 vol.%, 90 vol.% of the R2Fe14B phase consists of crystal grains of a specific grain diameter, and the axial lattice constant of the R2Fe14B phase is larger than that in a balanced state by 0.3 to 1%. The material alloy (B) has the specific composition of R-B-M. In the material alloy (B), a main phase R2Fe14B is 85 vol.%, and an R-rich phase is not larger than 15 vol.%. The method also comprises a process of crushing the alloys (A) and (B), a process of molding crushed powder, a process of sintering the molded matter, and a heat treatment process for treating a sintered matter with heat.
COPYRIGHT: (C)2004,JPO&NCIPI
Inventors:
Kenji Konishi
Hiroshi Abe
Shinya Tabata
Application Number:
JP2002381779A
Publication Date:
August 13, 2008
Filing Date:
December 27, 2002
Assignee:
Santoku Co., Ltd.
International Classes:
B22F9/04; H01F1/053; B22F1/00; B22F3/00; C22C38/00; H01F1/08; H01F41/02
Domestic Patent References:
| JP7066022A | | | | |
| JP2002033207A | | | | |
| JP1146310A | | | | |
Attorney, Agent or Firm:
Hajime Sakai
Masahiro Kurai
