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NdFeB magnet with high cu and high al and preparation method thereof

A NdFeB magnet technology, applied in magnetic objects, magnetic circuits characterized by magnetic materials, inductor/transformer/magnet manufacturing, etc., can solve the problem of low Hcj, high Cu NdFeB magnets with low mechanical strength, NdFe Problems such as poor mechanical properties of boron magnets, to achieve the effect of ensuring magnetic properties

Active Publication Date: 2021-06-25
FUJIAN CHANGTING GOLDEN DRAGON RARE EARTH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the defects in the prior art that increasing the Cu content will lead to poor mechanical properties of the sintered NdFeB magnets, and provide high Cu and high Al NdFeB magnets and its preparation method
The invention can effectively solve the problems of low mechanical strength and low Hcj of high Cu NdFeB magnets by jointly adding a certain amount of Al, RH, and high melting point metal elements

Method used

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  • NdFeB magnet with high cu and high al and preparation method thereof
  • NdFeB magnet with high cu and high al and preparation method thereof
  • NdFeB magnet with high cu and high al and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0080] The preparation method of NdFeB magnet is as follows:

[0081] (1) Smelting: According to the mass percentages of elements in each embodiment and comparative example shown in Table 1, a raw material formula satisfying the mass percentages of the elements is configured. The raw materials are smelted, and a quick-setting casting method is adopted to obtain Nd-Fe-B alloy castings.

[0082] The average thickness of the NdFeB alloy cast sheet is 0.28mm.

[0083] (2) Hydrogen breaking: The hydrogen pressure in the hydrogen adsorption process of the NdFeB alloy cast sheet is 0.081 MPa; the temperature in the dehydrogenation process is 500 ° C to obtain NdFeB powder.

[0084] (3) Jet mill: Send the NdFeB powder into the jet mill for further crushing by the jet mill to obtain fine powder.

[0085] The oxygen content in the mill chamber of the jet mill is below 50ppm.

[0086] The rotating speed of the sorting wheel in the jet mill treatment is 4000rpm / min.

[0087] The parti...

Embodiment 2

[0096] The preparation method of NdFeB magnet is as follows:

[0097] Except the selected raw material formula is different and the average thickness of the NdFeB alloy casting in step (1) smelting is 0.30mm, the parameters in the other preparation process are the same as the preparation process of Example 1.

[0098] The parameters in the preparation process of Comparative Examples 18-21 are the same as those of Example 2 except that the selected raw material formulations are different.

Embodiment 3

[0100] The preparation method of NdFeB magnet is as follows:

[0101] Except that the selected raw material formula is different and the sintering temperature in step (5) sintering is 1040° C., the parameters in the other preparation process are the same as the preparation process of Example 1.

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Abstract

The invention discloses a high Cu and high Al NdFeB magnet and a preparation method thereof. High Cu and high Al NdFeB magnets contain: 29.5-33.5% R, 0.985% or more B, 0.50% or more Al, 0.35% or more Cu, 1% or more RH and 0.1-0.4% high melting point elements N and Fe; wherein, the percentage is the mass percentage of the element in the total amount of elements; wherein, the mass percentage of the element content needs to satisfy the following relationship: (1) 1<RH<0.11R<3.54B; (2 )0.12RH<Al. The invention can effectively solve the problem of insufficient strength of high Cu magnets by jointly adding a certain proportion of Al, RH, and high-melting point metal elements, while ensuring the magnetic performance of magnet materials.

Description

technical field [0001] The invention relates to a high Cu and high Al NdFeB magnet and a preparation method thereof. Background technique [0002] With its excellent performance, NdFeB permanent magnet material is currently the most widely used rare earth permanent magnet material. It is widely used in electronics, electric machinery, medical equipment, toys, packaging, hardware machinery, aerospace and other fields. The more common ones are Permanent magnet motors, loudspeakers, magnetic separators, computer disk drives, magnetic resonance imaging equipment instruments, etc. [0003] Adding Cu to NdFeB magnets can effectively improve the coercive force of NdFeB magnets, but when the amount of Cu added exceeds 0.35wt%, the enrichment of Cu at the grain boundaries will lead to the formation of microcracks after sintering and reduce the The compactness and strength of the magnets affect the magnetic properties of NdFeB magnets and limit the availability of high Cu technology ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0577H01F1/0576H01F41/0253H01F41/0266H01F1/0573C22C38/002C22C38/005C22C38/06C22C38/10C22C38/14C22C38/12C22C38/16C22C2202/02H01F41/0273H01F1/057H02K1/02
Inventor 牟维国谢志兴黄佳莹黄清芳
Owner FUJIAN CHANGTING GOLDEN DRAGON RARE EARTH CO LTD
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