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Rare earth permanent magnetism material and its making method

A technology of rare earth permanent magnets and manufacturing methods, which is applied in the direction of magnetic materials, magnetic objects, electrical components, etc., and can solve problems affecting the magnetic properties of magnets, etc.

Active Publication Date: 2008-09-17
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In conclusion, when the dispersion of the R-rich phase is insufficient to cover the grain boundaries of the main phase, the coercivity decreases locally on the grain boundaries that are not covered, thus affecting the magnetic properties of the whole magnet

Method used

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  • Rare earth permanent magnetism material and its making method

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Embodiment 1

[0035]Neodymium (Nd), Dy-Fe, Terbium (Tb), Fe-B, Nb-Fe, Co, Al, Cu and Fe are used to provide an alloy composition consisting of 28.5% by weight Nd, 1% (weight) of Dy, 0.5 (weight) of Tb, 1.00% (weight) of B, 0.4% (weight) of Nb, 1.00% (weight) of Co, 0.20% (weight) of Al, 0.10% ( weight) of Cu and the balance of Fe. The raw material was melted in an alumina crucible in a high-frequency vacuum induction furnace under an argon atmosphere. Alloy flakes about 0.3-0.5 mm thick are formed by quick-setting method. The high-temperature alloy flakes separated from the casting rolls were kept warm for 1 hour in a box made of high heat insulating material. The alloy sheet is then loaded into a box with a water-cooled structure to rapidly cool the strip to room temperature. Hydrogen is absorbed in the obtained alloy at room temperature, and then released from the alloy at 560°C, and the alloy is broken into alloy powders of about 0.5mm by using the deformation in the hydrogen absorpti...

Embodiment 2

[0038] Neodymium (Nd), Dy-Fe, Terbium (Tb), Fe-B, Nb-Fe, Co, Al, Cu and Fe are used to provide an alloy composition consisting of 27.5% by weight Nd, 1.5% (weight) of Dy, 1 (weight) of Tb, 1.00% (weight) of B, 0.4% (weight) of Nb, 1.00% (weight) of Co, 0.20% (weight) of Al, 0.10% ( weight) of Cu and the balance of Fe. The raw material was melted in an alumina crucible in a high-frequency vacuum induction furnace under an argon atmosphere. Alloy flakes about 0.3-0.5 mm thick are formed by quick-setting method. The high-temperature alloy flakes separated from the casting rolls were kept warm for 1 hour in a box made of high heat insulating material. The alloy sheet is then loaded into a box with a water-cooled structure to rapidly cool the strip to room temperature. Hydrogen is absorbed in the obtained alloy at room temperature, and then released from the alloy at 560°C, and the alloy is broken into alloy powders of about 0.5mm by using the deformation in the hydrogen absorpt...

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Abstract

The invention relates to a rare earth permanent magnet and a manufacturing method thereof, more particularly a neodymium ferroboron permanent magnet material and a manufacturing method thereof. The rare earth permanent magnet comprises a rapid hardening alloy and a crystal boundary object, the crystal boundary object is one or more of metal Nd, Pr, Sm, Eu, Gd, Tb, Dy, Ho, Al, Cu, Sn, Zn, the crystal boundary mixture is 0.3-2% of the total weight. The crystal boundary object, without melting, directly crushes pure metals or the metal mixture with hydrogen and adds gas stream to mill into powder, then mixes with main phase rapid hardening alloy powder to form and sinter, the performance of magnet is more improved than the magnet with the same ingredients in traditional procedure. The invention omits a melting procedure of the crystal boundary object, directly adds the powder and saves the production cost of the magnet.

Description

technical field [0001] The invention relates to a rare earth permanent magnet and a manufacturing method thereof, in particular to a neodymium iron alloy permanent magnet material and a manufacturing method thereof. Background technique [0002] In the past, R-Fe-B series rare earth permanent magnets mainly used a single alloy process, that is, preparation of R-Fe-B series alloy → powder making → orientation molding → sintering. The microstructure of the magnet made of single alloy is not ideal. By improving the microstructure of the magnet, the magnet with the same composition can obtain higher performance or the magnet with the same performance contains less precious elements. The invention relates to optimizing the formula of the magnet, improving the production process so as to achieve the purpose of improving the magnetic performance and saving rare earth raw materials. [0003] The ferromagnetic phase that contributes the most to the magnetic properties in R-Fe-B magn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/053C22C1/04B22F9/08B22F3/16C21D1/26
Inventor 郝忠彬
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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