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A kind of bonded magnetic powder and preparation method thereof

A technology of magnetic powder and weight percentage content, which is applied in the direction of inductance/transformer/magnet manufacturing, magnetic objects, magnetic materials, etc., and can solve problems such as demagnetization

Active Publication Date: 2020-06-23
成都银磁材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the development of new energy vehicles and high-end equipment, the performance requirements of NdFeB materials are getting higher and higher, especially the equipment or devices made of permanent magnet materials are generally impossible to work at a constant temperature, the traditional pure NdFeB Boron magnetic materials demagnetize with the increase of temperature. Therefore, in order to meet the application requirements of high-end equipment, it is necessary to improve the high temperature resistance and magnetic properties of NdFeB permanent magnet materials. Low point, high coercive force products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A bonded magnetic powder, the weight percentage of each element of the bonded magnetic powder is composed of: Nd 11.5%, Ga 0.3%, B5.9%, Co 3.5%, Zn 1%, and the balance is Fe.

[0023] The preparation method of the above-mentioned bonded magnetic powder comprises the following steps:

[0024] 1) According to the weight percentage of each element, take each raw material and add it to the vacuum melting furnace. -2 Under the vacuum state of Pa, it is melted into an alloy ingot;

[0025] 2) The alloy ingot smelted in step 1) is crushed and put into a vacuum induction quenching furnace, and melted into a molten metal at a temperature of 1500°C. The quenching speed is controlled at 25~33m / s, and the molten metal is rapidly quenched into Uniform strips with a thickness of 50 ± 5 μm;

[0026] 3) Break the uniform strip prepared in step 2) into 40 mesh magnetic powder;

[0027] 4) Put the magnetic powder prepared in step 3) at 4.5~5.5×10 -2 Under a vacuum degree of Pa and a ...

Embodiment 2

[0029] A bonded magnetic powder, the weight percentage of each element of the bonded magnetic powder is composed of: Nd 10.5%, Ga 0.6%, B5.5%, Co 3%, Zn 0.8%, and the balance is Fe.

[0030] The preparation method of the above-mentioned bonded magnetic powder comprises the following steps:

[0031] 1) According to the weight percentage of each element, take each raw material and add it to the vacuum melting furnace. -2 Under the vacuum state of Pa, it is melted into an alloy ingot;

[0032] 2) The alloy ingot smelted in step 1) is crushed and put into a vacuum induction quenching furnace, and melted into a molten metal at a temperature of 1450°C. The quenching speed is controlled at 25~33m / s, and the molten metal is rapidly quenched into Uniform strips with a thickness of 50 ± 5 μm;

[0033] 3) Break the uniform strip prepared in step 2) into 40 mesh magnetic powder;

[0034] 4) Put the magnetic powder prepared in step 3) at 4.5~5.5×10 -2 At a vacuum degree of Pa and a tem...

Embodiment 3

[0036] A bonded magnetic powder, the metal elements of the bonded magnetic powder are composed of: Nd 11%, Ga 0.2%, B6%, Co 3.2%, Zn 0.5%, and the balance is Fe.

[0037] The preparation method of the above-mentioned bonded magnetic powder comprises the following steps:

[0038] 1) 1) According to the weight percentage of each element, take each raw material and add it to the vacuum melting furnace. -2 Under the vacuum state of Pa, it is melted into an alloy ingot;

[0039] 2) The alloy ingot smelted in step 1) is crushed and put into a vacuum induction quenching furnace, and melted into a molten metal at a temperature of 1480°C. The quenching speed is controlled at 25~33m / s, and the molten metal is rapidly quenched into Uniform strips with a thickness of 50 ± 5 μm;

[0040] 3) Break the uniform strip prepared in step 2) into 40 mesh magnetic powder;

[0041] 4) Put the magnetic powder prepared in step 3) at 4.5~5.5×10 -2 Under a vacuum degree of Pa, in an environment fill...

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Abstract

The invention relates to the technical field of permanent magnet material processing, in particular to a bonded magnetic powder and a preparation method thereof. The weight percent content of each element in the magnetic powder is as follows: Nd 10.5-11.5%, Ga 0.2-0.6%, B 5.5-6%, Co 3-3.5%, Zn 0.5-1%, and the balance is Fe. The addition of cobalt makes the Curie temperature of the magnetic powder increase linearly, and the reversible temperature coefficient of the magnetic induction decreases. The addition of zinc can inhibit the precipitation of α-Fe phase and significantly increase the coercive force of magnetic powder. In the case of cobalt and gallium, adding zinc can reduce the irreversible loss of magnetic flux of magnetic powder. The preparation method of the present invention further improves the high-temperature resistance performance of the magnetic powder, and increases its Curie point and coercive force by selecting appropriate melting and crystallization parameter conditions.

Description

technical field [0001] The invention relates to the technical field of permanent magnet material processing, in particular to a bonded magnetic powder and a preparation method thereof. Background technique [0002] Due to its excellent performance (high remanence, high coercive force, high magnetic energy product), NdFeB permanent magnet materials have become an indispensable and important material basis in the field of modern science and technology, and the demand for NdFeB has been greatly increased . With the development of new energy vehicles and high-end equipment, the performance requirements of NdFeB materials are getting higher and higher, especially the equipment or devices made of permanent magnet materials are generally impossible to work at a constant temperature, the traditional pure NdFeB Boron magnetic materials demagnetize with the increase of temperature. Therefore, in order to meet the application requirements of high-end equipment, it is necessary to impr...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F41/02C22C38/10B22F1/00B22F9/04
CPCB22F1/0003H01F1/0578H01F41/0253C22C38/002C22C38/005C22C38/10B22F9/04B22F1/142
Inventor 张卫华
Owner 成都银磁材料有限公司
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