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Method for fabricating NdFeB magnet from waste NdFeB magnet

A neodymium-iron-boron and magnet technology, applied in the field of high-grade neodymium-iron-boron magnets, can solve the problems of low utilization rate of recycled materials and cost reduction.

Active Publication Date: 2017-01-11
CHINA STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the proportion of recycled materials used in the above method is only 10-40%, that is, 60-90% uses new materials. The utilization rate of recycled materials is too low, and the cost reduction is limited.

Method used

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Embodiment Construction

[0022] In order to make the above and other objects, features, and advantages of the present invention more comprehensible, preferred embodiments of the present invention will be exemplified below and described in detail in conjunction with the accompanying drawings. Furthermore, the directional terms mentioned in the present invention are, for example, up, down, top, bottom, front, back, left, right, inside, outside, side, surrounding, central, horizontal, transverse, vertical, longitudinal, axial, The radial direction, the uppermost layer or the lowermost layer, etc. are only directions referring to the attached drawings. In addition, the singular forms "a", "an" and "the" mentioned in the present invention include plural references, unless the context clearly dictates otherwise. For example, the term "a compound" or "at least one compound" may include multiple compounds, including mixtures thereof; "%" mentioned in the present invention refers to "weight percent (wt%)" unle...

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Abstract

The invention provides a method for fabricating an NdFeB magnet from a waste NdFeB magnet. The method comprises the steps of providing first powder, wherein the first powder is formed from the waste NdFeB magnet; providing second powder, wherein the second powder is formed from an alloy thin strip; mixing the first powder and the second powder to form mixed powder, wherein the first powder relative to the weight of the mixed powder accounts for 90-99wt%; and sequentially performing magnetic field pressing and matching, vacuum sintering and thermal processing on the mixed powder to form the NdFeB magnet.

Description

technical field [0001] The present invention relates to a method for manufacturing NdFeB magnets from waste NdFeB magnets, in particular to a method of recycling NdFeB magnet wastes with poor magnetic properties and producing NdFeB magnets with high magnetic properties method. Background technique [0002] In order to meet the needs of the market or end applications, NdFeB magnets are usually made of strip casting (Strip casting) raw materials, through hydrogen crushing and jet milling (Jet Mill) steps, magnetic field forming alignment, sintering and heat treatment to make square (rectangular) magnets. ) After the blank is sintered, the required magnet shape is obtained through processing and grinding, such as tile shape, circular ring or fan shape, etc. To adapt to different shape requirements, the yield rate of processing square blanks into various shapes is about 20-70%, that is, there will be 30-80% processing waste. These wastes contain high-priced rare earth elements...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/057B22F8/00B22F9/04
CPCY02W30/50
Inventor 丘军浩黃宏胜陈柏伟
Owner CHINA STEEL
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