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Preparation method of increasing coercive force of neodymium iron boron magnet

A technology of neodymium iron boron and coercive force, which is applied in the field of permanent magnet preparation, can solve the problems that the process method is difficult to achieve, and achieve the effects of reducing remanence, increasing coercive force and excellent performance

Inactive Publication Date: 2017-10-10
京磁材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Now in order to prepare permanent magnets with high remanence and high coercive force, it is difficult to achieve

Method used

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  • Preparation method of increasing coercive force of neodymium iron boron magnet
  • Preparation method of increasing coercive force of neodymium iron boron magnet
  • Preparation method of increasing coercive force of neodymium iron boron magnet

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Embodiment 1

[0033] This embodiment provides a preparation method for improving the coercive force of an NdFeB magnet, the steps comprising:

[0034] 1) breaking the NdFeB sintered raw material into coarse powder;

[0035] 2) Jet milling the coarse powder obtained in step 1 to obtain a powder, the particle size of which is 2.0 μm;

[0036] 3) mixing the crushed heavy rare earth metal Dy after hydrogen explosion treatment with an organic solvent to form a viscous solution, and the weight percentage of the heavy rare earth metal powder is greater than 50%;

[0037] 4) Apply the configured viscous solution evenly on the inner wall of the mold, and then pour the powder prepared in step 2 into the mold;

[0038] 5) Put the mold with powder on the limited position of the press, apply a magnetic field above 13000Oe, and press at the same time, the density of the green body is 3.5g / cm 3 , the surface of the pressed green body is attached with a layer of solution containing heavy rare earth eleme...

Embodiment 2

[0054] This embodiment provides a preparation method for improving the coercive force of an NdFeB magnet, the steps comprising:

[0055] 1) breaking the NdFeB sintered raw material into coarse powder;

[0056] 2) Jet milling the coarse powder obtained in step 1 to obtain a powder, the particle size of which is 4.0 μm;

[0057] 3) mixing the crushed heavy rare earth metal DyTb after hydrogen explosion treatment with an organic solvent to form a viscous solution, and the weight percentage of the heavy rare earth metal powder is greater than 50%;

[0058] 4) Apply the configured viscous solution evenly on the inner wall of the mold, and then pour the powder prepared in step 2 into the mold;

[0059]5) Put the mold with powder on the limited position of the press, apply a magnetic field above 13000Oe, and press at the same time, the density of the green body is 5.5g / cm 3 , the surface of the pressed green body is attached with a layer of solution containing heavy rare earth elem...

Embodiment 3

[0077] This embodiment provides a preparation method for improving the coercive force of an NdFeB magnet, the steps comprising:

[0078] 1) breaking the NdFeB sintered raw material into coarse powder;

[0079] 2) Jet milling the coarse powder obtained in step 1 to obtain a powder, the particle size of which is 2.0 μm;

[0080] 3) mixing the crushed Dy-containing compound with an organic solvent after hydrogen explosion treatment to form a viscous solution, and the weight percentage of the heavy rare earth metal powder is greater than 50%;

[0081] 4) Apply the configured viscous solution evenly on the inner wall of the mold, and then pour the powder prepared in step 2 into the mold;

[0082] 5) Put the mold with powder on the limited position of the press, apply a magnetic field above 13000Oe, and press at the same time, the density of the green body is 3.5g / cm 3 , the surface of the pressed green body is attached with a layer of solution containing heavy rare earth elements...

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Abstract

The invention discloses a preparation method for improving the coercive force of an NdFeB magnet. The steps include: 1) breaking the sintered NdFeB raw material into coarse powder; 2) performing airflow grinding on the coarse powder obtained in step 1 to prepare Obtain powder; 3) mix the heavy rare earth metal powder with an organic solvent to configure a viscous solution; 4) evenly smear the configured viscous solution on the inner wall of the mold, and then pour the powder prepared in step 2 into the mold 5) compact; 6) put the green body into a sintering furnace under the protection of nitrogen and vacuumize the sintering furnace at a pressure of 0.4-0.6 Pa; 7) sintering. The present invention makes heavy rare earth metals form neodymium-rich phases at the grain boundaries, greatly improving the coercive force, and at the same time, because the neodymium-rich phases containing heavy rare earth metals only exist at the grain boundaries and the outer layer of the main phase, it basically does not reduce the residual phase. magnetic. The special preparation method can obtain a magnet with excellent performance.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet preparation, and in particular relates to a preparation method for improving the coercive force of an NdFeB magnet. Background technique [0002] Permanent magnets are hard magnets, magnets that can maintain their magnetism for a long time, and are not easy to lose their magnetization or be magnetized. Therefore, whether in industrial production or in daily life, hard magnets are one of the most commonly used strong materials. NdFeB magnets are also called Neodymium magnets, and their chemical formula is Nd 2 Fe 14 B, is an artificial permanent magnet, which is composed of iron and low-cost, abundant resources, and stable supply of neodymium and boron elements, which can be manufactured cheaply. At the same time, the magnetic energy product of NdFeB can reach that of ferrite Therefore, NdFeB magnets are widely used in wind power, motors, VCM, drones and other fields due to their excell...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F1/08H01F41/02B22F9/04B22F3/02B22F3/10
CPCH01F1/0571B22F3/02B22F3/10B22F9/04B22F2003/026H01F1/0577H01F41/0266
Inventor 姜华
Owner 京磁材料科技股份有限公司