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Production method of permanent magnet material

A technology for permanent magnet materials and production methods, which is applied in the manufacture of magnetic materials, magnetic objects, inductors/transformers/magnets, etc., can solve problems such as difficulties in the deposition of heavy rare earth metals, and achieve improved electroplating efficiency, improved utilization, and intrinsic correction Excellent effect of tenacity

Active Publication Date: 2020-02-18
BAOTOU TIANHE MAGNETICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This makes it very difficult to deposit heavy rare earth metals on the surface of magnets using aqueous solutions as electroplating solutions
Therefore, there is no report on electroplating heavy rare earth elements on the surface of magnets with aqueous solution as electroplating solution to improve coercive force.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] S1) Magnet manufacturing process:

[0057] In terms of atomic percentage, 12.5% ​​of Nd, 1.5% of Dy, 0.5% of Al, 0.5% of Co, 0.05% of Cu, 0.2% of Nb, 5.9% of B and the rest of Fe are used to prepare magnet raw materials; Under the environment of air protection, the magnet raw material is heated and melted by intermediate frequency induction in a vacuum intermediate frequency quick-setting induction furnace, and then cast on a rotating quenched copper roller at 1480°C to obtain an alloy sheet with an average thickness of 0.3mm. The alloy flakes were hydrogenated and crushed under 0.1MPa hydrogen, and then vacuum dehydrogenated at 550°C to obtain coarse magnetic powder with an average particle size D50 of 300 μm, which was then pulverized into fine magnetic powder with an average particle size D50 of 3 μm by a jet mill. Under the protection of nitrogen, the fine magnetic powder is pressed into a green body on a molding press with an orientation magnetic field of 1.8T; vac...

Embodiment 2

[0075] S1) Magnet manufacturing process:

[0076] In terms of atomic percentage, 12.5% ​​of Nd, 1.5% of Dy, 0.5% of Al, 0.5% of Co, 0.05% of Cu, 0.2% of Nb, 5.9% of B and the rest of Fe are used to prepare magnet raw materials; Under the environment of air protection, the magnet raw material is heated and melted by intermediate frequency induction in a vacuum intermediate frequency quick-setting induction furnace, and then cast on a rotating quenched copper roller at 1480°C to obtain an alloy sheet with an average thickness of 0.3mm. The alloy sheet was hydrogenated and crushed under 0.08MPa hydrogen, and then vacuum dehydrogenated at 550°C to obtain a coarse magnetic powder with an average particle size D50 of 300 μm; the coarse magnetic powder was crushed by a jet mill into a fine magnetic powder with an average particle size D50 of 3.0 μm. Under the protection of nitrogen, the fine magnetic powder is pressed into a green body on a molding press with an orientation magnetic ...

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Abstract

The invention discloses a production method of a permanent-magnet material. The production method comprises the steps of electroplating heavy rare-earth metal on a surface of a sintered magnet in an electroplating liquid so as to form a magnet with a plating layer; and performing thermal treatment on the magnet with the plating layer so that the heavy rare-earth metal is diffused in the sintered magnet, wherein the electroplating liquid is an aqueous solution containing a soluble heavy rare-earth salt a soluble VIII metal salt and a coordination agent, and the coordination agent is a substance which can be used for positively moving a deposition potential of the heavy rare-earth metal. The coordination agent and the VIII metal salt are added into the electroplating agent, thus, the electroplating efficiency can be substantially improved, the reaction of a heavy rare-earth element and water is reduced, the production efficiency is improved, and the utilization ratio of the heavy rare-earth metal is improved.

Description

technical field [0001] The invention relates to a production method of a permanent magnet material, in particular to a method for improving the coercive force of the permanent magnet material. Background technique [0002] With the increasing demand for hybrid electric vehicles, pure electric vehicles and energy-saving air-conditioning compressors, the demand for rare earth permanent magnet materials with high coercive force (such as R-Fe-B-M series rare earth permanent magnets) is also increasing. bigger and bigger. Using traditional methods to increase the coercive force of magnets (H cj ), requires the use of a large amount of heavy rare earth elements, resulting in a substantial increase in the cost of the magnet, and will lead to a decrease in remanence (Br) and energy product (BH). The study found that the grain boundary structure has an important impact on improving the coercive force of the magnet. The heavy rare earth elements can enter the grain boundary of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02H01F1/057
CPCH01F1/0573H01F1/0576H01F1/0577H01F41/0266H01F41/0293
Inventor 吴树杰董义刁树林张帅袁易陈雅袁文杰
Owner BAOTOU TIANHE MAGNETICS TECH CO LTD