Invention Grant
- Patent Title: Rare-earth magnet and method of manufacturing the same
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Application No.: US17539491Application Date: 2021-12-01
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Publication No.: US12217907B2Publication Date: 2025-02-04
- Inventor: Masaaki Ito , Daisuke Ichigozaki , Noritsugu Sakuma , Akihito Kinoshita , Michiya Kume , Hisashi Maehara
- Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA , NICHIA CORPORATION
- Applicant Address: JP Toyota; JP Anan
- Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA,NICHIA CORPORATION
- Current Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA,NICHIA CORPORATION
- Current Assignee Address: JP Toyota; JP Anan
- Agency: Oliff PLC
- Priority: JP2020-209452 20201217
- Main IPC: H01F41/02
- IPC: H01F41/02 ; B22F3/16 ; B22F3/24 ; H01F1/059

Abstract:
A rare-earth magnet and a method of manufacturing the same are provided. The method includes: preparing Sm—Fe—N magnetic powder; preparing reforming material powder containing metallic zinc; mixing the magnetic powder and the reforming material powder to obtain mixed powder; subjecting the mixed powder to compression molding in a magnetic field to obtain a magnetic-field molded body; subjecting the magnetic-field molded body to pressure sintering to obtain a sintered body; and subjecting the sintered body to heat treatment. A content proportion of the metallic zinc in the reforming material powder is 10 to 30% by mass with respect to the mixed powder. When a temperature and time in conditions for the heat treatment are defined as x° C. and y hours, respectively, the formulas y≥−0.32x+136 and 350≤x≤410 are met.
Public/Granted literature
- US20220199321A1 RARE-EARTH MAGNET AND METHOD OF MANUFACTURING THE SAME Public/Granted day:2022-06-23
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