Alloy powder for rare-earth magnet, methods for manufacturing alloy powder and rare-earth magnet and powder manufacturing device

A technology for rare earth magnets and alloy powders, which is applied to the powder making device for manufacturing alloy powders for rare earth magnets and the field of manufacturing alloy powders for rare earth magnets, which can solve the problems of low coercivity, squareness, heat resistance, magnets, and production costs rise and other problems, to achieve the effect of saving precious rare earths, not reducing the coercive force, and saving rare earths

Active Publication Date: 2014-05-28
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, methods for manufacturing alloy powder and rare-earth magnet and powder manufacturing device
  • Alloy powder for rare-earth magnet, methods for manufacturing alloy powder and rare-earth magnet and powder manufacturing device
  • Alloy powder for rare-earth magnet, methods for manufacturing alloy powder and rare-earth magnet and powder manufacturing device

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Experimental program
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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

[0080] The difference between embodiment 4-6 and embodiment 1-3 is:

[0081] 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:

[0082] The weight proportion of each composition of table 4

[0083]

[0084] According to the preparation composition of the above 4 to 6, a total of 10Kg of raw materials were weighed and prepared respectively.

[0085] 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 alloy powder for a rare-earth magnet, methods for manufacturing the alloy powder and the rare-earth magnet and a powder manufacturing device. The method for manufacturing the alloy powder includes acquiring all powder with the grain size smaller than 50 micrometers in working procedures for finely crushing at least one type of alloy for the rare-earth magnet and at least one type of alloy coarse powder for the rare-earth magnet by the aid of high-speed inert gas flow with the oxygen content lower than 1000ppm. By the aid of the alloy powder, the methods and the powder manufacturing device, ultrafine powder with the grain size smaller than 1 micrometer does not need to be separated from crushed powder which is transmitted from a crushing device and has a low oxygen content, the oxygen content of atmosphere of the crushing device is reduced and is lower than 1000ppm when the crushing device is used for crushing, and accordingly abnormal grain growth (AGG) can be prevented in a follow-up sintering procedure for acquiring a sintered magnet with a low oxygen content. The alloy powder, the methods and the powder manufacturing device have the advantages that working procedures can be simplified, and the manufacturing cost can be reduced.

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 Applications(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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