Bonded magnet and preparation method thereof

A bonded magnet and binder technology, which is used in magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc. Mechanical properties, good magnetic properties, and the effect of solving large brittleness and low toughness

Pending Publication Date: 2022-02-25
新昌中国计量大学企业创新研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiments of the present application provide a bonded magnet to solve the shortcomings of the bonded magnet in the prior art, such as low addition of magnetic powder and low toughness and high brittleness, so that the bonded magnet has excellent magnetic and mechanical properties

Method used

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  • Bonded magnet and preparation method thereof

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[0033] Another aspect of the embodiments of the present application provides a method for preparing a bonded magnet, comprising the following steps:

[0034] Material preparation: prepare magnetic powder, coupling agent, lubricant and binder;

[0035] Surface treatment: Mix magnetic powder, coupling agent and lubricant to obtain surface modified magnetic powder;

[0036] Mixing: mixing surface modified magnetic powder with binder to obtain blended magnetic powder;

[0037] Molding: The blended magnetic powder is molded to obtain a bonded magnet;

[0038] In the molding step, the molding process includes at least one of compression molding, injection molding or extrusion molding.

[0039] In the method of preparing bonded magnets, the pre-mixing of magnetic powder, coupling agent and lubricant can better modify the surface of the magnetic powder, ensuring that the system has excellent fluidity and processability during the preparation process.

[0040] As an implementation met...

Embodiment 1

[0046] A bonded magnet, raw materials include 88.0g of NdFeB magnetic powder, 6.0g of polyurethane material, 4.5g of polyester resin, 0.7g of silane coupling agent, 0.5g of polyisocyanate, 0.15g of polyethylene wax and 0.15 g zinc stearate.

[0047] The preparation process of bonded magnet is as follows:

[0048] Material preparation: Prepare NdFeB magnetic powder, polyurethane material, polyester resin, silane coupling agent, polyisocyanate, lubricant according to the ingredients;

[0049] Surface treatment: Dissolve silane coupling agent, polyethylene wax and zinc stearate in 10ml of acetone to form a mixed solution. Under nitrogen atmosphere, mix and stir the mixed solution with NdFeB magnetic powder for 6 minutes, and then put it under 0.2MPa Under the vacuum degree, heat treatment at 95°C for 2 hours;

[0050] Mixing: mix surface-treated NdFeB magnetic powder, polyurethane material, polyester resin and polyisocyanate to obtain molding raw materials;

[0051] Molding: t...

Embodiment 2

[0053] A bonded magnet, raw materials include 90.0g of NdFeB magnetic powder, 4.6g of polyurethane material, 4.0g of polyester resin, 0.8g of phthalate coupling agent, 0.4g of polyisocyanate, 0.1g of polyethylene wax and 0.1 g zinc stearate.

[0054] The preparation process of bonded magnet is as follows:

[0055] Material preparation: Prepare NdFeB magnetic powder, polyurethane material, polyester resin, phthalate coupling agent, polyisocyanate, lubricant according to the ingredients;

[0056] Surface treatment: Dissolve phthalate coupling agent, polyethylene wax and zinc stearate in 10ml of acetone to form a mixed solution. Under a helium atmosphere, mix and stir the mixed solution with NdFeB magnetic powder for 10 minutes, then Heat treatment at 100°C for 1.5 hours under a vacuum of 0.4MPa;

[0057] Mixing: mix surface-treated NdFeB magnetic powder, polyurethane material, polyester resin and polyisocyanate to obtain molding raw materials;

[0058] Forming: the forming ra...

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PUM

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Abstract

The invention discloses a bonded magnet and a preparation method thereof. The bonded magnet comprises the following raw materials: magnetic powder, a coupling agent, a lubricant and a binder, wherein the binder accounts for 5-16% of the weight of the raw materials, and the binder comprises a polyurethane material, polyester resin and polyisocyanate. The bonded magnet disclosed by the invention is good in performance consistency, good in formability, accurate in size, high in residual magnetism and good in mechanical property. The problems of low addition amount, high brittleness and low toughness of bonded magnet magnetic powder in the prior art are solved.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular to a bonded magnet and a preparation method thereof. Background technique [0002] Magnetic materials are an important class of basic functional materials. Magnetic materials are widely used in production and life. They have applications in the fields of electronic information, automobiles, electric tools, home appliances and even aerospace. They are a type of basic materials that are difficult to replace. [0003] The application of magnetic materials often requires magnets to have relatively precise dimensions. For magnets or integrally assembled parts that require high dimensional accuracy and complex shapes, many magnetic materials are difficult to meet the requirements for use. Bonded magnets are composites composed of magnetic powder, binder and appropriate additives. The magnetic powder is bonded by the binder and made into a specific shape according to a certain m...

Claims

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Application Information

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IPC IPC(8): H01F1/04H01F1/057H01F1/10H01F1/053H01F41/02
CPCH01F1/04H01F1/0571H01F1/10H01F1/053H01F41/02
Inventor 王疆瑛梁军张景基刘亚丕杜汇伟朱泽洁陈俊甫宗泉
Owner 新昌中国计量大学企业创新研究院有限公司
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