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Patent Searching and Data


Title:
METHOD FOR MANUFACTURING RARE EARTH PERMANENT MAGNET
Document Type and Number:
WIPO Patent Application WO/2019/212102
Kind Code:
A1
Abstract:
The present invention provides a method for manufacturing a rare earth permanent magnet which enables easy magnetic field orientation by narrowing the fineness distribution of powder via fine grinding that repeatedly grinds, multiple times, a rare earth alloy by supplying a high-pressure nitrogen gas according to a jet mill method, and which improves coercivity and thermal stability of a rare earth permanent magnet via grain refinement by using a hydrogenation-disproportionation-desorption-recombination (HDDR) process.

Inventors:
KIM, Dong Hwan (49 Dalseo-daero 85-gil, Dalseo-gu, Daegu, 42714, KR)
KONG, Koon Seung (216Dong 1601Ho, 125 Hosan-ro,Dalseo-gu, Daegu, 42706, KR)
Application Number:
KR2018/010756
Publication Date:
November 07, 2019
Filing Date:
September 13, 2018
Export Citation:
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Assignee:
STAR GROUP IND. CO., LTD (49 Dalseo-daero 85-gil, Dalseo-gu, Daegu, 42714, KR)
International Classes:
H01F41/02; B22F3/12; B22F9/04; H01F1/057
Attorney, Agent or Firm:
GOOD PATENT LAW FIRM (3F47, Hosan-roDalseo-gu, Daegu, 42711, KR)
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