Neodymium iron boron magnet and preparation method

A neodymium iron boron and magnet technology, applied in magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of easy oxidation of heavy rare earth metal compounds, poor oxidation resistance of magnets, reduction of remanence and magnetic energy product, etc. , to achieve the effect of saving heavy rare earth resources, remanence and maximum magnetic energy product stability, and magnetic energy product reduction

Active Publication Date: 2016-02-24
JIANGXI JLMAG RARE EARTH
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AI Technical Summary

Problems solved by technology

At present, the method of increasing the coercive force mainly increases the coercive force by adding heavy rare earth directly during smelting, but this method will significantly reduce the remanence and magnetic energy product on the basis of increasing the coercive force, and the heavy rare earth metal compound is very It

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  • Neodymium iron boron magnet and preparation method

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Example Embodiment

[0030] The present invention also provides a preparation method of an NdFeB magnet, comprising the following steps:

[0031] A) After the rare earth metal is subjected to rapid quenching, the rare earth amorphous belt is obtained, and after crushing, the rare earth amorphous powder is obtained;

[0032] B) mixing the rare earth amorphous powder obtained in the above steps with an organic solvent to obtain a suspension;

[0033] C) coating the suspension obtained in the above steps on the surface of the NdFeB blank to obtain a semi-finished product;

[0034] D) After heat-treating the semi-finished product obtained in the above steps, an NdFeB magnet is obtained.

[0035] In the present invention, firstly, the rare earth metal is rapidly quenched to obtain rare earth amorphous strips, and then crushed to obtain rare earth amorphous powder; the rare earth amorphous strips are preferably heavy rare earth amorphous strips. The method of rapid quenching in the present invention i...

Example Embodiment

[0046] Example 1

[0047] The rare earth Dy is put into a high-vacuum quick-quenching equipment, and the line speed of the cold roll is adjusted to 40 m / s by vacuuming. After quick-quenching, a rare-earth amorphous strip is obtained.

[0048] The rare earth amorphous ribbons obtained in the above steps are crushed in a ball mill to obtain rare earth amorphous Dy powder with an average particle size of about 2 μm, and the crushed powder is added to ethanol to form a suspension.

[0049] Process the 35SH NdFeB blank into a semi-finished product of 18*9.75*2.1 (2.1 is the orientation direction), process the semi-finished product, degrease and other pretreatments to make the surface clean and smooth; then put the pretreated semi-finished product into the suspension Soak the coating in the solution, so that the surface is evenly coated with a layer of amorphous Dy film, and then dry; then place the semi-finished product in a sintered graphite box, put the graphite box with the prod...

Example Embodiment

[0057] Example 2

[0058] Put the rare earth Dy and Tb into the high vacuum quick quenching equipment according to the mass ratio of 1:1, vacuumize and adjust the line speed of the cold roll to 50m / s, and obtain the rare earth amorphous belt after quick quenching.

[0059] The rare earth amorphous ribbon obtained in the above steps is crushed in a ball mill to obtain rare earth amorphous DyTb powder with an average particle size of about 1.8 μm, and the crushed powder is added to ethanol to form a suspension.

[0060] Process the 42SH NdFeB blank into a semi-finished product of 45*21*1.9 (1.9 is the orientation direction), process the semi-finished product, degrease and other pretreatments to make the surface clean and smooth; then put the pretreated semi-finished product into the suspension Soak the coating in the liquid to make the surface evenly coated with a layer of amorphous DyTb film, and then dry it; then place the semi-finished product in a sintered graphite box, put ...

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Abstract

The invention provides a neodymium iron boron magnet. The neodymium iron boron magnet is prepared through diffusion and heat treatment of a rare earth amorphous alloy and a neodymium iron boron magnet workblank. The rare earth amorphous alloy is used on the neodymium iron boron magnet, so that the coercivity of the magnet is remarkably improved, the original remanence of the magnet and the maximum magnetic energy product cannot be remarkably reduced, the oxidation resistance of rare earth powder is effectively improved through use of the rare earth amorphous alloy, the problems that the coercivity cannot be improved and heavy rare earth resources are wasted after oxidation of rare earth compounds are solved, the heavy rare earth resources are saved, and the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of magnet preparation, and in particular relates to an NdFeB magnet and a preparation method thereof. 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 ...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F1/06H01F41/02B22F7/08
CPCB22F7/08H01F1/0572H01F41/0253
Inventor 毛华云蔡报贵刘路军詹益街张锦红
Owner JIANGXI JLMAG RARE EARTH
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