A method of producing a SmFeN-based rare earth magnet, the method including: dispersing a SmFeN-based anisotropic magnetic powder including Sm, Fe, La, W, R, and N, wherein R is at least one selected from the group consisting of Ti, Ba, and Sr, using a resin-coated metal media or a resin-coated cera
A method of producing a SmFeN-based rare earth magnet, the method including: dispersing a SmFeN-based anisotropic magnetic powder including Sm, Fe, La, W, R, and N, wherein R is at least one selected from the group consisting of Ti, Ba, and Sr, using a resin-coated metal media or a resin-coated ceramic media to obtain a dispersed SmFeN-based anisotropic magnetic powder; mixing the dispersed SmFeN-based anisotropic magnetic powder with a modifier powder to obtain a powder mixture; compacting the powder mixture in a magnetic field to obtain a magnetic field compact; pressure-sintering the magnetic field compact to obtain a sintered compact; and heat-treating the sintered compact.
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1. A method of producing a SmFeN-based rare earth magnet, the method comprising: dispersing a SmFeN-based anisotropic magnetic powder comprising Sm, Fe, La, W, R, and N, wherein R is at least one selected from the group consisting of Ti, Ba, and Sr, using a resin-coated metal media or a resin-coated
1. A method of producing a SmFeN-based rare earth magnet, the method comprising: dispersing a SmFeN-based anisotropic magnetic powder comprising Sm, Fe, La, W, R, and N, wherein R is at least one selected from the group consisting of Ti, Ba, and Sr, using a resin-coated metal media or a resin-coated ceramic media to obtain a dispersed SmFeN-based anisotropic magnetic powder;mixing the dispersed SmFeN-based anisotropic magnetic powder with a modifier powder to obtain a powder mixture;compacting the powder mixture in a magnetic field to obtain a magnetic field compact;pressure-sintering the magnetic field compact to obtain a sintered compact; andheat-treating the sintered compact. 2. The method of producing a SmFeN-based rare earth magnet according to claim 1, wherein the dispersed SmFeN-based anisotropic magnetic powder has an average particle size of at least 2.0 μm but not more than 4.0 μm, a residual magnetization σr of not less than 152 emu/g, and an oxygen content of not higher than 0.5% by mass. 3. The method of producing a SmFeN-based rare earth magnet according to claim 1, wherein the resin-coated metal media is a nylon resin-coated iron core media. 4. The method of producing a SmFeN-based rare earth magnet according to claim 1, wherein the modifier powder is a zinc powder, a zinc alloy powder, or a combination thereof. 5. The method of producing a SmFeN-based rare earth magnet according to claim 1, wherein the modifier powder is a zinc powder. 6. The method of producing a SmFeN-based rare earth magnet according to claim 1, wherein, in mixing the dispersed SmFeN-based anisotropic magnetic powder with the modifier powder, an amount of the modifier powder relative to an amount of the dispersed SmFeN-based anisotropic magnetic powder is not more than 15% by mass. 7. The method of producing a SmFeN-based rare earth magnet according to claim 1, wherein, in mixing the dispersed SmFeN-based anisotropic magnetic powder with the modifier powder, an amount of the modifier powder relative to an amount of the dispersed SmFeN-based anisotropic magnetic powder is not less than 1% by mass. 8. The method of producing a SmFeN-based rare earth magnet according to claim 1, wherein, in pressure-sintering the magnetic field compact to obtain the sintered compact, the magnetic field compact is pressure-sintered at a temperature not lower than 310° C. 9. The method of producing a SmFeN-based rare earth magnet according to claim 1, wherein, in pressure-sintering the magnetic field compact to obtain the sintered compact, the magnetic field compact is pressure-sintered at a temperature not higher than 400° C.
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