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Bonded magnet and preparation method thereof

A technology of bonded magnets and inorganic binders, which is applied in the direction of magnetic objects, inductors/transformers/magnets, magnetic materials, etc., and can solve the problems of high production cost and low production efficiency of anisotropic NdFeB bonded magnets , to achieve the effect of strong shape retention and improved production efficiency

Active Publication Date: 2017-11-17
BEIJING ZHONG KE SAN HUAN HI TECH
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Problems solved by technology

[0006] The second object of the present invention is to provide a method for preparing bonded magnets to solve the technical problems of high production cost and low production efficiency of anisotropic NdFeB bonded magnets

Method used

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  • Bonded magnet and preparation method thereof
  • Bonded magnet and preparation method thereof

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Embodiment 1

[0053] Commercially available BMND-15P magnetic powder produced by Beikuang Magnetic Materials Co., Ltd. was used. The magnetic powder has been subjected to surface passivation and high temperature oxidation resistance treatment in advance.

[0054] (1) Dissolving sodium silicate equivalent to 2.0% of the weight of the magnetic powder through deionized water to obtain a sodium silicate solution, the concentration of the sodium silicate solution is controlled at 15 to 18wt%; the magnetic powder is put into the sodium silicate solution to form Magnetic powder-sodium silicate solution suspension, the suspension is evacuated, heated and stirred in special equipment to completely volatilize the solvent, and obtain dry pre-compressed magnetic powder uniformly coated with sodium silicate;

[0055] (2) Add molybdenum disulfide equivalent to 0.3% of the weight of the pre-compressed magnetic powder in the pre-compressed magnetic powder, and fully mix to obtain the pre-compressed mixed p...

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Abstract

The invention discloses a bonded magnet and a preparation method thereof. The magnet includes magnetic powder, an inorganic binder, a lubricant and metallic powder. The preparation method of the bonded magnet includes: mixing the magnetic powder, the inorganic binder, and a solvent to form a magnetic powder mixture. The inorganic binder is any of silicate, phosphate, sulfate and borate, or a mixture of two or more than two of the silicate, phosphate, sulfate and borate; the metallic powder is any of Cu powder, Al powder, Zn powder, copper alloy powder, aluminum alloy powder, and zinc alloy powder, or a mixture of two or more than two of the Cu powder, Al powder, Zn powder, copper alloy powder, aluminum alloy powder, and zinc alloy powder. According to the method, magnetic powder covering is performed through the inorganic binder, and then the problem that the magnetic powder covered by an organic binder is poor in fluidity at a high temperature, so the pre-compressed magnetic powder cannot be evenly and stably filled in a die cavity, and cannot be filled in a thin wall die cavity even can be solved; and the inorganic binder can allow high shape preserving ability of a formed blank at the high temperature, and the formed blank can be directly released from the die when the formed blank is not cooled, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of bonded magnet preparation, and in particular relates to an anisotropic NdFeB bonded magnet and a preparation method of the magnet. Background technique [0002] The NdFeB permanent magnet material known as the "Permanent Magnet King" came out in 1983. After more than 30 years of rapid development, it has reached an annual output of more than 100,000 tons, and its output value ranks first among permanent magnet materials. The depth, the rapid maturity of its technology, and the wide range of applications can be called miracles in the history of material development. However, anisotropic NdFeB bonded magnets, which are a main branch of NdFeB permanent magnet materials, have high magnetic properties, high dimensional accuracy, short production cycle, and can be made into thin-walled and complex-shaped sizes. Accurate magnets and other advantages, but due to its high production cost and low production effici...

Claims

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Application Information

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IPC IPC(8): H01F1/047H01F1/08H01F41/02
CPCH01F1/047H01F1/083H01F41/0266H01F41/0273
Inventor 秦国超饶晓雷敖学如蔡道炎胡伯平
Owner BEIJING ZHONG KE SAN HUAN HI TECH
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