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A kind of preparation method of NdFeB magnet

A neodymium-iron-boron, system technology, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of easy agglomeration of fine powder, waste of resources and cost, affecting the performance of magnets, etc. The effect of reducing production costs and reducing safety hazards

Active Publication Date: 2016-10-26
廊坊京磁精密材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the small Fibonacci particle size, large specific surface area, and high activity of this part of the fine powder, it is easy to cause spontaneous combustion in the production process and cause safety hazards. If it is fired in the final NdFeB magnet, the fine powder is easy to burn. Agglomeration, forming defects, and affecting the performance of the magnet, so manufacturers usually discard this part of the fine powder.
However, these fine powders contain a large amount of rare earth elements, and the content is much higher than the rare earth content in the NdFeB powder required for normal production. Direct discarding causes waste of resources and increased costs.

Method used

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  • A kind of preparation method of NdFeB magnet

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preparation example Construction

[0037] The present invention also provides a preparation method of an NdFeB magnet, comprising the following steps:

[0038] A) after mixing the NdFeB fine powder and the organic additive described in any one of the above-mentioned technical solutions, obtain the NdFeB fine powder mixture;

[0039] B) after sintering the NdFeB fine powder mixture obtained in step A) and NdFeB powder, an NdFeB magnet is obtained;

[0040] The Fischer grain size of the fine NdFeB powder is less than 2.5 μm.

[0041]In the present invention, firstly, the NdFeB fine powder is mixed with the organic additive provided by the present invention to obtain the NdFeB fine powder mixture; the Fischer particle size of the NdFeB fine powder is preferably less than 2.5 μm, more preferably less than or equal to 2.3 μm, most preferably less than or equal to 2.0 μm; the Fischer particle size of the NdFeB powder is preferably 2.5-4.0 μm, more preferably 2.8-3.7 μm, most preferably 3.0-3.5 μm; the organic additi...

Embodiment 1

[0057] First, take methyl octanoate, liquid paraffin, polybutene with a molecular weight of 400, silane coupling agent KH550 and the rest of the n-pentane solvent by mass percentage to obtain organic additives. See Table 2 for specific mass percentages. Table 2 is the implementation The mass percent composition of the organic additive prepared in example 1.

[0058] The mass percent composition of the organic additive prepared in Table 2 Example 1

[0059]

[0060] Then, weigh Pr-Nd: 30wt%, Dy: 3.5wt%, Al: 0.5wt%, B: 1.0wt%, Cu: 0.1wt%, Co: 1.0wt% and the rest Fe, Alloy flakes with a thickness of 0.15mm were produced by melting and casting by SC process, and NdFeB magnet coarse powder was produced by HD process.

[0061] Then put the NdFeB coarse powder into the jet mill, use compressed nitrogen to grind into fine powder, adjust the parameters of the jet mill, and control the Fischer particle size of the powder to be 2.5-5.0 μm to obtain NdFeB powder.

[0062] Take out th...

Embodiment 2

[0070] First weigh nonanoic acid methyl ester, liquid paraffin, polybutene with a molecular weight of 400, silane coupling agent KH570 and the rest of the n-hexane solvent to obtain organic additives, see Table 4 for specific mass percentages, and Table 4 is for implementation The mass percent composition of the organic additive prepared in example 2.

[0071] The mass percent composition of the organic additive prepared in Table 4 Example 2

[0072]

[0073] Then, weigh Pr-Nd: 30wt%, Dy: 0.5wt%, Al: 1.0wt%, B: 1.0wt%, Cu: 0.1wt%, Co: 1.0wt% and the rest Fe, The alloy flakes with an average thickness of 0.18mm were obtained by melting and casting by SC process, and the NdFeB magnet coarse powder was produced by HD process.

[0074] Then put the NdFeB coarse powder into the jet mill, use compressed nitrogen to grind into fine powder, adjust the parameters of the jet mill, and control the Fischer particle size of the powder to be 3.0-5.0 μm to obtain NdFeB powder.

[0075] ...

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Abstract

The invention provides an organic additive for neodymium iron boron magnet manufacturing. The additive is characterized by comprising, by mass percentage, 0.1-50% of ester matter, 0.1-25% of liquid paraffin, 0.05-10% of polybutylene, 0.01-5% of coupling agents and the balance varsol. The invention provides a method for manufacturing a neodymium iron boron magnet. The method includes the following steps that neodymium iron boron ultra-fine powder is mixed with the organic additive to obtain a neodymium iron boron ultra-fine powder mixture, and then the obtained neodymium iron boron ultra-fine powder mixture and neodymium iron boron powder are sintered to obtain the neodymium iron boron magnet. According to the method for manufacturing the neodymium iron boron magnet, the prepared organic additive and the neodymium iron boron ultra-fine powder are added into the sintering process of the magnet so that the ultra-fine powder can be effectively used; besides, the ultra-fine powder is not prone to spontaneous combustion and agglomeration in the production process, and safety hidden hazards are reduced, and production cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of magnet preparation, and in particular relates to a preparation method of an NdFeB magnet. Background technique [0002] A magnet is a substance that can generate a magnetic field and has the property of attracting ferromagnetic substances such as iron, nickel, cobalt and other metals. Magnets are generally divided into permanent magnets and soft magnets. Most of the materials used as magnetizers and electromagnets are soft magnets, and their polarity changes with the polarity of the applied magnetic field; permanent magnets are hard magnets, which can maintain their magnetic properties for a long time. , It is not easy to lose magnetization, and it is not easy to be magnetized. Therefore, whether in industrial production or in daily life, hard magnets are one of the most commonly used strong materials. [0003] Hard magnets can be divided into natural magnets and artificial magnets. Artificial magnets m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F1/08H01F41/02
Inventor 陈思思
Owner 廊坊京磁精密材料有限公司
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