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Preparation method for high-performance bonded neodymium iron boron permanent magnet material

A permanent magnet material, NdFeB technology, applied in the direction of magnetic material, inorganic material magnetism, magnetic object, etc., can solve the problem of magnetic performance and mechanical performance decline, and achieve the effect of high magnetic performance and less non-magnetic phase

Active Publication Date: 2017-02-08
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the traditional bonded magnets usually use organic polymers as binders and their magnetic properties and mechanical properties will be greatly reduced when they are applied in a relatively high temperature environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) Select commercially available quenched NdFeB magnetic powder with a particle size of 75-125 μm;

[0021] 2) Smelting Ce 80 co 20 (mass fraction) alloy target;

[0022] 3) Deposit Ce on the surface of NdFeB powder by magnetron sputtering 80 co 20 Alloy thin layer, vacuumize to (3-5)×10 -3 After Pa, 0.1Pa argon is introduced as a protective gas, and the sputtering power per unit target area is maintained at 10w / cm 2 , the sputtering time is 2h, and the thickness of the deposited layer is 180nm;

[0023] 4) The surface-coated NdFeB powder is put into the mold, and vacuum hot-pressed to achieve a vacuum degree of 2×10 - 3 After the Pa is higher than the argon protection, the hot-pressing temperature is 490°C, the pressure is 100MPa, and the holding time is 8min. Finally, a bonded magnet with high magnetic properties and high mechanical strength is obtained.

Embodiment 2

[0025] 1) Select commercially available quenched NdFeB magnetic powder with a particle size of 75-125 μm;

[0026] 2) Smelting Nd 65 Dy 25 Al 10 (mass fraction) alloy target;

[0027] 3) Deposit Nd on the surface of NdFeB powder by magnetron sputtering 65 Dy 25 Al 10 Alloy thin layer, vacuumize to (3-5)×10 -3 After Pa, 0.1Pa argon is introduced as a protective gas, and the sputtering power per unit target area is maintained at 8w / cm 2 , the time is 2h, and the thickness of the deposited layer is 150nm;

[0028] 4) The surface-coated NdFeB powder is put into the mold, and vacuum hot-pressed to achieve a vacuum degree of 2×10 - 2 After the Pa is higher than the argon protection, the hot-pressing temperature is 580°C, the pressure is 100MPa, and the holding time is 10min. Finally, a bonded magnet with high magnetic properties and high mechanical strength is obtained.

Embodiment 3

[0030] 1) Select commercially available quenched NdFeB magnetic powder with a particle size of 75-125 μm;

[0031] 2) Smelting Pr 83 co 2 Cu 15 (mass fraction) alloy target;

[0032] 3) Depositing Pr on the surface of NdFeB powder by magnetron sputtering 83 co 2 Cu 15 Alloy thin layer, vacuumize to (3-5)×10 -3 After Pa, argon gas is introduced as a protective gas, and the sputtering power per unit target area is maintained at 6w / cm 2 , the time is 2h, and the thickness of the deposited layer is 100nm;

[0033] 4) The surface-coated NdFeB powder is put into the mold, and vacuum hot-pressed to achieve a vacuum degree of 2×10 - 2 After the Pa is higher than the argon protection, the hot pressing temperature is 430°C, the pressure is 100MPa, and the holding time is 15min. Finally, a bonded magnet with high magnetic properties and high mechanical strength is obtained.

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Abstract

The invention relates to a preparation method for a high-performance bonded neodymium iron boron permanent magnet material, belonging to the field of a rare earth permanent magnetic material. The preparation method is characterized by the following steps: coating the surface of rapid quenching neodymium iron boron powder with low-melting metal or alloy film (melting point scope: 300-600 DEG C) according to a vapor deposition method; performing vacuum hot pressing molding under the temperature being 0.85-0.95 times of the melting point of the metal or alloy; lastly, acquiring a high-performance bonded neodymium iron boron magnet. The low-melting metal or alloy is composed of R-M, R-N, R-(M,N) or N-N; the melting point scope is at 300-600 DEG C; R is one or more of La, Ce, Pr, Nd, Gd, Tb, Dy and Ho; M is one or more of Fe, Co and Ni; N is one or more of Cu, Al, Ga, Zn, Sn and Ag. The high-performance bonded neodymium iron boron permanent magnet material has the advantages that magnet strength and magnetic performance are high, and the electric conductivity is excellent, so that the high-performance bonded neodymium iron boron permanent magnet material, compared with the traditional bonded neodymium iron boron magnet, is more beneficial to electrophoresis treatment of the anti-corrosion layer of the magnet.

Description

technical field [0001] The invention belongs to the field of rare earth permanent magnet materials, in particular to a preparation method of a high-performance bonded NdFeB permanent magnet material. Background technique [0002] Bonded NdFeB magnets have the characteristics of complex shape, high dimensional accuracy, no need for secondary processing, high material utilization, high production efficiency, low cost, and excellent magnetic properties. They are widely used in hard disk drives, optical drives, office automation, consumer electronics , household appliances, automobile industry, etc. are widely used. [0003] The production methods of bonded magnets mainly include injection molding, extrusion molding, and compression molding. The characteristic of bonded magnet production is that magnetic powder, binder, coupling agent, lubricant, etc. need to be mixed in a certain proportion, and then magnets are prepared by injection molding, extrusion molding or compression m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/08B22F1/02B22F3/14
CPCH01F1/0572H01F1/0576H01F1/0578B22F3/14B22F2003/145B22F1/17
Inventor 包小倩高学绪卢克超马斌
Owner UNIV OF SCI & TECH BEIJING