Title:
ND-FE-B MULTILAYER SINTERED MAGNET AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2022/163407
Kind Code:
A1
Abstract:
The present invention provides: an Nd-Fe-B multilayer sintered magnet which is magnetically uniform, while having high magnetic characteristics; and a method for producing this Nd-Fe-B sintered magnet without carrying out a cutting step. This method comprises: a step for producing an Nd-Fe-B thin plate-like sintered magnet, which has a thickness of 3 mm or less and a high orientation degree of 90% or more, and wherein the c-axis direction of an Nd2Fe14B tetragonal compound is oriented within the main surface of the Nd-Fe-B thin plate-like sintered magnet, without carrying out a cutting step by supplying and filling a mold with an alloy powder, the mold having a structure that is divided by a plurality of partition plates which are arranged at regular intervals, subsequently having the alloy powder oriented by applying a magnetic field in a direction that is parallel to the main surface of a cavity that is divided by the partition plates, and then performing sintering; and a step for stacking a plurality of Nd-Fe-B thin plate-like sintered magnets that are obtained by the above-described step.
Inventors:
SAGAWA MASATO (JP)
Application Number:
PCT/JP2022/001412
Publication Date:
August 04, 2022
Filing Date:
January 17, 2022
Export Citation:
Assignee:
NDFEB CORP (JP)
International Classes:
H01F41/02; B22F3/00; B22F3/02; B22F3/14; B22F3/24; B22F7/04; B22F7/08; C22C33/02; C22C38/00; H01F1/057; H01F7/02
Domestic Patent References:
| WO2001095460A1 | 2001-12-13 |
Foreign References:
| JP2012019030A | 2012-01-26 | |||
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| JP6280137B2 | 2018-02-14 | |||
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| JP2019075493A | 2019-05-16 | |||
| JPS6134242B2 | 1986-08-06 | |||
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| JP2011078268A | 2011-04-14 | |||
| JP4391897B2 | 2009-12-24 | |||
| JP6280137B2 | 2018-02-14 |
Attorney, Agent or Firm:
MINORI PATENT PROFESSION CORPORATION (JP)
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