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Alloy powder for rare-earth magnet, method for producing rare-earth magnet, and powder-making device

The technology of a rare earth magnet and its manufacturing method is applied to the powder making device for manufacturing rare earth magnet alloy powder and the field of manufacturing alloy powder for rare earth magnet, which can solve the problems of low magnet, low coercive force, low heat resistance of squareness, and low production cost. rise and other problems, to achieve the effect of not reducing the coercive force, saving precious rare earths, and saving rare earths

Active Publication Date: 2018-01-16
FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the sintering process, if the oxygen content is too small, it is easy to cause over-sintering, and it is easy to cause the problem of abnormal grain growth, and the problems of low coercive force, squareness and heat resistance are also more significant.
As a well-known improved method, Ga, Zr, Mo, V, W, etc. are usually added at about 0.5% to 1% by weight in order to prevent abnormal grain growth. However, these elements are mostly non-magnetic elements, and there are not only steps The disadvantages of complexity and increased production costs, and it is easy to cause the problem of low magnet Br and (BH)max

Method used

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  • Alloy powder for rare-earth magnet, method for producing rare-earth magnet, and powder-making device
  • Alloy powder for rare-earth magnet, method for producing rare-earth magnet, and powder-making device
  • Alloy powder for rare-earth magnet, method for producing rare-earth magnet, and powder-making device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0044] The present invention takes NdFeB series rare earth alloy magnetic powder as an example to illustrate the production process and evaluation process of rare earth magnetism.

[0045] Its production process mainly includes the following processes: raw material preparation→smelting→casting→hydrogen crushing→fine pulverization→forming in a magnetic field→sintering→heat treatment→magnetic performance evaluation→evaluation of oxygen content in the sintered body.

[0046] In raw material preparation process: prepare the Nd of purity 99.5%, industrial Fe-B and industrial pure Fe, and the weight ratio of each composition meets as shown in table 1:

[0047] The weight proportion of each composition of table 1

[0048]

[0049] According to the preparation composition of the above-mentioned 1 to 3, a total of 10Kg of raw materials were weighed and prepared respectively.

[0050] In the smelting process: the prepared raw materials are put into a crucible made of alumina, and an...

Embodiment 4-6

[0078] The difference between embodiment 4-6 and embodiment 1-3 is:

[0079] In raw material preparation process: prepare the Nd of purity 99.5%, industrial Fe-B and industrial pure Fe, and the weight ratio of each composition meets as shown in table 4:

[0080] The weight proportion of each composition of table 4

[0081]

[0082] According to the preparation composition of the above 4 to 6, a total of 10Kg of raw materials were weighed and prepared respectively.

[0083] The pulverizing equipment used in the fine pulverization process is as follows: image 3 As shown in , it includes a pulverizing device 1, a first collecting device 2, a material tank 3, a second collecting device 4 and a compressor 5; The air outlet 13 of the crushing device, the air inlet 12 of the crushing device is connected to the compressor 5, and the air outlet 13 of the crushing device is provided with a filter 14 for passing the powder with a particle size below 20 μm; the first collecting devi...

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Abstract

The invention discloses an alloy powder for rare earth magnets, a method for manufacturing rare earth magnets and a powder making device. The high-speed gas flow of inert gas with an oxygen content of less than 1000 ppm is used to prepare at least one alloy for rare earth magnets or at least one kind of rare earth magnets. In the step of finely pulverizing the alloy coarse powder for rare earth magnets, all powders having a particle size of 50 μm or less are obtained. It no longer separates ultrafine powder below 1 μm from the low oxygen content pulverized powder sent from the pulverizing device whose atmospheric oxygen content drops below 1000 ppm during pulverization, so that the subsequent sintering process of obtaining low oxygen content sintered magnets is less prone to crystal formation. Abnormal growth of grains (AGG), and has the characteristics of simplifying the process and reducing the production cost.

Description

technical field [0001] The invention relates to the technical field of manufacturing magnets, in particular to a method for manufacturing alloy powder for rare earth magnets, a method for manufacturing rare earth magnets and a powder making device for manufacturing alloy powder for rare earth magnets. Background technique [0002] Rare earth magnets are based on intermetallic compounds R 2 T 14 B-based magnets, in which R is a rare earth element, T is iron, or a transition metal element that replaces iron and a part of iron, B is boron, which has extremely high magnetic properties, and is known as the king of magnetism. The maximum magnetic energy product (BH)max is more than 10 times higher than the maximum magnetic energy product of ferrite magnets (Ferrite). In addition, the machining performance of rare earth magnets is excellent, and the working temperature can reach up to 200 degrees Celsius. Moreover, its texture is hard and its performance is stable. It has a good ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/04H01F1/057H01F41/02
Inventor 永田浩吴冲浒
Owner FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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