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Elastic bonding type Nd-Fe-B magnetic material and manufacturing method thereof

A magnetic material, NdFeB technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problem of high refining temperature NdFeB magnetic powder oxidation, unfavorable bonding NdFeB magnetic material, NdFeB magnetic powder easy Oxidation and other problems occur, to achieve the effect of enhancing the bonding strength, broad application prospects, and preventing oxidation

Active Publication Date: 2010-10-20
江门江益磁材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, in the current method of manufacturing bonded NdFeB magnetic materials, NdFeB magnetic powder is prone to oxidation; moreover, the high refining temperature in the existing process also accelerates the oxidation of NdFeB magnetic powder, and oxidation will not be conducive to bonding Control of Magnetic Properties of Type NdFeB Magnetic Materials
In order to solve this problem, some people propose to add antioxidants, and some people propose to impregnate NdFeB magnetic powder with coupling agent to prevent its oxidation, but these methods have not completely solved the oxidation problem, such as the coupling agent cannot form the effect of complete impregnation, Unable to form a uniform coating layer, resulting in poor anti-oxidation effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] First, mix 500 grams of NdFeB magnetic powder (commercially available) that has been screened through a sieve of 40 mesh or more with 8 grams of coupling agent (NDZ-105), so that the coupling agent is completely impregnated with NdFeB magnetic powder, and then Then add 30 grams of strontium ferrite magnetic powder (North Mine 4D magnetic powder), 60 grams of CPE plastic (Xinghuo 130), 7 grams of plasticizer (epoxy soybean oil, commercially available) and 5 grams of adhesive ( Commercially available), the prepared powder is smelted in the open mill for about 30 minutes, when the roller temperature drops to 40°C-70°C, the rubber mixing step is carried out, and when the temperature of the rubber mixing sheet drops to room temperature, calendering is carried out. Rough pressing is carried out first, and then fine pressing is carried out. The roller temperature of fine pressing (that is, finishing) is controlled at room temperature, the thickness of fine pressing is controlle...

Embodiment 2

[0027] First, mix 300 grams of NdFeB magnetic powder screened through a sieve of 40 mesh or more with 2 grams of coupling agent, so that the coupling agent is completely impregnated with NdFeB magnetic powder, and then add 10 grams of barium ferrite Magnetic powder, 25 grams of PE plastics, 3 grams of plasticizer, 3 grams of binder and 50% recycled material of the total weight of the aforementioned substances, the prepared powder is smelted in an open mill for about 30 minutes, when When the temperature of the roller drops to 40°C-70°C, the rubber mixing step is carried out. When the temperature of the rubber mixing film drops to room temperature, calendering is carried out. Firstly, rough pressing is carried out, and then fine pressing is carried out. The roller temperature of fine pressing is controlled at room temperature. The thickness of fine pressing is controlled at about 2.1mm, the surface is smooth and smooth, and then heat treatment is carried out at 30°C for 2 hours....

Embodiment 3

[0030] First, mix 300 grams of NdFeB magnetic powder and 100 grams of NdFeN magnetic powder with 5 grams of coupling agent that have been screened through a sieve of 40 mesh or more, so that the coupling agent is completely impregnated with NdFeB magnetic powder and NdFeB. Nitrogen magnetic powder, then add 50 grams of strontium ferrite magnetic powder, 50 grams of CPE plastic, 5 grams of plasticizer and 3 grams of binder, and melt the prepared powder in the open mill for about 30 minutes , when the temperature of the roller drops to 40°C-70°C, the rubber mixing step is carried out. When the temperature of the rubber sheet drops to room temperature, the calendering is carried out. Firstly, the rough pressing is carried out, and then the fine pressing is carried out. The roller temperature of the fine pressing is controlled at At room temperature, the thickness of sizing is controlled at about 2.1mm, the surface is smooth and smooth, and then heat treatment is carried out at 30°...

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Abstract

The invention provides an elastic bonding type Nd-Fe-B magnetic material, which is prepared through the following steps: preparation of raw materials, refinement of the prepared powder mixture, rolling, heat treatment and formation, thereby obtaining the elastic bonding type Nd-Fe-B magnetic material. The raw materials comprise the following components: 10-95 parts by weight of Nd-Fe-B magnetic powder, 1-50 part(s) by weight of ferrite powder selected from strontium ferrite and / or barium ferrite, 2-20 parts by weight of adhesive selected from at least one of CPE plastic, PE plastic and NBR rubber, 0.1-3 part(s) by weight of coupling agent, 0.2-3 part(s) by weight of plasticizer and 0.1-3 part(s) by weight of binder. The preparation of the raw materials comprises the following steps: screening the Nd-Fe-B magnetic powder with a 40-mesh sieve or a sieve with more than 40 meshes, blending the Nd-Fe-B magnetic powder after screening and the coupling agent until the coupling agent is completely dipped in the metal magnetic powder, and adding other raw materials. The invention also provides a manufacturing method of the elastic bonding type Nd-Fe-B magnetic material.

Description

technical field [0001] The invention relates to a neodymium-iron-boron magnetic material and a manufacturing method thereof, in particular to an elastic bonding type neodymium-iron-boron magnetic material and a manufacturing method thereof. Background technique [0002] Since Japan's Daido Electronics Company launched the NF series NdFeB rubber magnets to the market in 2002, this type of magnets has quickly gained a reputation in the market for its excellent flexibility, bendability, cold resistance and heat resistance, and has been widely used in audio Magnets used in ultra-small diameter motors, CD, DVD-ROM, DC brushless fan motors, thin panel speakers, and under harsh conditions. In recent years, the total output value of NdFeB bonded magnets has reached about 200 million US dollars, and with the advent of rubber NdFeB permanent magnets and the reduction of costs, the market growth rate of bonded NdFeB will be higher and higher. [0003] At present, the magnetic properti...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F1/08B22F3/12
Inventor 汪南东李栋良杨世清彭亮肖友军
Owner 江门江益磁材有限公司
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