Title:
永久磁石用希土類系合金粉末の製造方法
Document Type and Number:
Japanese Patent JP4288637
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method which industrially mass produces rare earth based alloy powder for a permanent magnet, where a rare earth based bonded magnet and a sintered magnet which have stable high coercive force and large remanent magnetization can be obtained, when HDDR treatment of R-T-(M)-B material alloy is performed. SOLUTION: By completing first dehydrogenation treatment under specified conditions, large coercive force can be obtained in a powder state, while large magnetization is maintained in a second dehydrogenation treatment, where a great deal of treatment is enabled. That is, a material alloy of the intermediate product which is obtained in the first treatment can be left as it is, and a great deal of the material alloy for the intermediate product can be treated at a time in the second treatment. Thereby an HDDR-treated powder having high magnetic characteristic can be obtained.
Inventors:
Hiroyuki Tomizawa
Application Number:
JP33793499A
Publication Date:
July 01, 2009
Filing Date:
November 29, 1999
Export Citation:
Assignee:
Hitachi Metals Co., Ltd.
International Classes:
H01F1/06; B22F1/00; B22F9/04; H01F1/053; H01F1/057; H01F41/02
Domestic Patent References:
| JP6501135A | ||||
| JP7090308A | ||||
| JP7054003A | ||||
| JP10041113A | ||||
| JP7076754A | ||||
| JP5209210A | ||||
| JP2004901A |