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A bonded NdFeB strong magnet and its preparation method

A technology of NdFeB and strong magnets, which is applied in the field of bonded NdFeB strong magnets and its preparation, can solve the problems of easy environment, easy pulverization and corrosion of prepared materials, low Curie temperature point, etc., and achieve uniform magnetic properties and The effect of stability, small dimensional change, and high impact resistance

Active Publication Date: 2016-05-11
金华市磁莱福磁铁科技有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The advantages of NdFeB are high cost performance and good mechanical properties. The disadvantages are that the Curie temperature is low, the temperature characteristics are poor, and it is easy to pulverize and corrode. It must be improved by adjusting its chemical composition and adopting surface treatment methods. , in order to meet the requirements of practical application
But using these two methods to prepare NdFeB magnets, the manufacturing cost is high, it is not easy to change its shape, and the prepared materials are easy to cause environmental pollution

Method used

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  • A bonded NdFeB strong magnet and its preparation method

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Comparison scheme
Effect test

Embodiment 1

[0027] refer to figure 1 , first put 85% by weight of NdFeB magnetic powder, 2% of ferrite rubber and plastic magnetic powder, 8% of rubber, 0.5% of nylon, and 4.5% of additives into the mixer, and the order of addition should be It depends on the performance requirements of plasticizing rubber, the role of compounding agents, the performance of dispersion and the amount used. In this embodiment, the binder and additives are added first, and then the main material is added to mix materials with different specific gravity evenly. Then put the mixed material into the internal mixer for mixing and plasticization (S1). The mixing temperature should be appropriate. High temperature is conducive to the plastic flow and deformation of raw rubber and rubber material, and is beneficial to the rubber on the surface of solid compound particles. Wetting and mixing to eat powder, but it will reduce the viscosity of the rubber material, which is not conducive to the crushing and dispersion...

Embodiment 2

[0029] refer to figure 1 , first put 87% by weight of NdFeB magnetic powder, 4% of ferrite rubber and plastic magnetic powder, 3.5% of rubber, 0.5% of polyphenylene sulfide, and 5% of additives into the mixer. The sequence should be determined according to the performance requirements of the plasticizing rubber, the role of the compounding agent, the performance of the dispersion and the amount used. In this embodiment, the binder and auxiliary agent are added first, and then the main material is added, so that various materials with different specific gravity are mixed evenly. Then put the mixed material into the internal mixer for mixing and plasticization (S1). The mixing temperature should be appropriate. High temperature is conducive to the plastic flow and deformation of raw rubber and rubber material, and is beneficial to the rubber on the surface of solid compound particles. Wetting and mixing to eat powder, but it will reduce the viscosity of the rubber material, whi...

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Abstract

The invention provides a bonded NdFeB (neodymium, ferrum and boron) magnet. The magnet comprises the following raw materials in percentage by weight: 80-95 percent of NdFeB powder, 0-20 percent of ferrite rubber magnetic powder, 0-20 percent of rubber, 0-20 percent of functional plastic, and the balance of assistant. The invention further provides a preparation method of the bonded NdFeB strong magnet. With the adoption of the bonded NdFeB strong magnet and the preparation method thereof, the produced product is soft, small in brittleness, high and stable in magnetic property, easy to be assembled, and various specifications and dimensions can be easily formed, and meanwhile, the preparation cost is low, the efficiency is high, the energy is saved the consumption is reduced; and moreover, the magnet and the method are environment-friendly and halogen-free, and are pollution-free for the environment.

Description

technical field [0001] The invention relates to a magnet and a preparation method thereof, in particular to a bonded NdFeB strong magnet and a preparation method thereof. Background technique [0002] Magnetic synthetic material (product) is a new type of polymer functional material developed in the past two years, and it is one of the important basic materials (products) in the field of modern science and technology. Magnetic synthetic materials are divided into two types: structural type and composite type. Among them, composite magnetic synthetic materials are divided into two categories, thermoplastic and thermosetting. Thermoplastic magnetic synthetic materials can be divided into two categories according to the processing method, one is based on chlorinated polyethylene or nitrile rubber, etc., and the magnetic rubber is formed by rubber processing technology; the other is made of nylon, polyphenylene sulfide, etc. Injection (extrusion) magnets for substrates. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F7/02H01F1/057H01F1/08H01F41/02
Inventor 周红义
Owner 金华市磁莱福磁铁科技有限公司
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