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US 2024/0062936 A1Published application
Method of producing rare earth magnetic powder and rare earth magnetic powder
AssigneesNichia Corporation, Toyota Jidosha Kabushiki Kaisha
InventorsHisashi MAEHARA, Masaaki ITO, Tomonori INUZUKA, Motoki HIRAOKA
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Abstract
A method of producing a rare earth magnetic powder, the method including: heat-treating a mixture containing a SmFeN-based magnetic powder containing Sm, Fe, and N and a modifier powder containing Zn; and dispersing the heat-treated SmFeN-based magnetic powder using a resin-coated metal media or a resin-coated ceramic media.
Claims10
A method of producing a rare earth magnetic powder, the method comprising:
- heat-treating a mixture comprising a SmFeN-based magnetic powder containing Sm, Fe, and N and a modifier powder containing Zn;
- and
- dispersing the heat-treated SmFeN-based magnetic powder using a resin-coated metal media or a resin-coated ceramic media.
A SmFeN-based rare earth magnetic powder, comprising Sm, Fe, and N,
- wherein the SmFeN-based rare earth magnetic powder comprises at least 6% by mass but not more than 10% by mass of Zn based on a total amount of the rare earth magnetic powder, and
- wherein the SmFeN-based rare earth magnetic powder has a particle size D50 corresponding to a 50th percentile of a cumulative particle size distribution by volume of the SmFeN-based rare earth magnetic powder that is at least 1 μm but not more than 4 μm, a residual magnetization σr that is not less than 120 emu/g, and a squareness ratio Hk that is not less than 13000 Oe.
Dependencies are inferred from the claim text.