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Stress-field-oriented anisotropic flexible bonded neodymium-iron-boron magnet and preparation method thereof

An anisotropic, neodymium-iron-boron technology, applied in the direction of magnets, magnetic objects, inductors/transformers/magnets, etc., can solve the problems that the stress field orientation cannot be achieved, and the magnets are difficult to meet the application requirements, etc., and achieve easy preparation and good Curvature, the effect of expanding the application field

Active Publication Date: 2011-04-06
GUANGZHOU GOLDEN SOUTH MAGNETIC MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When this kind of flake NdFeB magnetic powder passes between the two pressure rollers of the calender during the rolling process, the flake magnetic powder will rotate in the rubber matrix, and the flat surface of the sheet is arranged regularly perpendicular to the direction of the external force. The aggregation of easy magnetization axes is formed in the direction of pressure, thereby realizing orientation. This orientation does not require any external magnetic field, and is completely realized by the mechanical force between the two rollers of the calender. The process is simple, and it can be made into ultra-thin, ultra-long, ultra-thin Wide sheets, strips and products of various shapes, but the magnetic powder processed only by calendering cannot achieve the purpose of stress field orientation, and the produced magnets are also difficult to meet higher-end application requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for preparing an anisotropic flexible bonded NdFeB magnet with stress field orientation, comprising the following steps:

[0025] (1) Flattening treatment process: Add 2000g of magnetic powder (particle size -80 mesh) obtained by crushing the MQIII magnet into an appropriate amount of absolute ethanol to form a liquid slurry (ball material ratio 10:1, Φ is 2mm and Φ4 is mm Balls account for 50% each), the slurry was flattened in the stirring mill for 3 hours, then heated to 60°C in an oven, and baked at this temperature for 2 hours, to obtain anisotropic flake magnetic powder with good flattening (the ratio of the average particle size to the average thickness is 10);

[0026] (2) Magnetic powder coating process: Take 200g of the above magnetic powder and 4g of nano-silica, add it to 12g of silicone resin dissolved in toluene and mix evenly, heat to 80°C until the solvent is completely evaporated, then heat in a vacuum oven at 260°C And solidified at this temp...

Embodiment 2

[0032] A method for preparing an anisotropic flexible bonded NdFeB magnet with stress field orientation, comprising the following steps:

[0033] (1) Flattening treatment process: Add 2000g of the magnetic powder obtained by crushing the MQIII magnet (the particle size is -80 mesh, the brand is 37-11) into an appropriate amount of pure alcohol to form a liquid slurry (the ratio of ball to material is 7:1, Φ is 2mm and balls with Φ of 4mm each account for 50%). After the slurry is flattened in the stirring mill for 6 hours, it is heated to 60°C in an oven and baked at this temperature for 2 hours to obtain a well-flattened shape isotropic Anisotropic flaky magnetic powder, the ratio of average particle size to average thickness is 11;

[0034] (2) Magnetic powder coating process: Take 200g of the above-mentioned flattened magnetic powder and 4g of nano-silica, add them to 12g of silicone resin dissolved in toluene and mix evenly, heat to 80°C until the solvent is completely eva...

Embodiment 3

[0040] A method for preparing an anisotropic flexible bonded NdFeB magnet with stress field orientation, comprising the following steps:

[0041] (1) Flattening treatment process: Add 2000g of the magnetic powder obtained by crushing the MQIII magnet (the particle size is -80 mesh, the brand is 37-11) into an appropriate amount of pure alcohol to form a liquid slurry (the ratio of balls to materials is 7:1, Φ2 is mm and balls with Φ of 4mm each account for 50%). After the slurry is flattened in the stirring mill for 6 hours, it is heated to 60°C in an oven and baked at this temperature for 2 hours to obtain a well-flattened shape isotropic Anisotropic flaky magnetic powder, the ratio of average particle size to average thickness is 12.

[0042] (2) Magnetic powder coating process: Take 200g of the above-mentioned magnetic powder and 3g of nano-silica, add them to 9g of silicone resin dissolved in toluene and mix evenly, heat to 80°C until the solvent is completely volatilized,...

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Abstract

The invention relates to a stress-field-oriented anisotropic flexible bonded neodymium-iron-boron magnet and a preparation method thereof. The preparation method comprises the following steps of: crushing an MQIII magnet; and flattening, coating with organic silicone resin, mixing and milling with a bonder and additives, and rolling into a magnet with a certain thickness, wherein the magnet is prepared from the following components in percentage by weight: 75-95 percent of anisotropic neodymium-iron-boron magnetic powder, 5-20 percent of bonder and 0-5 percent of other additives. The invention has the advantages of simple process, easiness of large-size magnet preparation and high production efficiency and is compatible with the favorable immunity of the flexible magnet, and the magnet can be continuously wound on a shaft which is 10 times the thickness of the magnet without fracture, reach the highest performance up to 110kJ / m<3> and even exceed the performance of an anisotropic rigid molded magnet so as to further expand the application fields of flexible magnets.

Description

technical field [0001] The invention relates to a neodymium iron boron magnet and a preparation method thereof, in particular to a stress field orientation anisotropic flexible bonded neodymium iron boron magnet and a preparation method thereof. Background technique [0002] In the big family of permanent magnet materials, the ones that came out in the 1980s are based on Nd 2 Fe 14 The NdFeB permanent magnet with B as the matrix has the most excellent magnetic properties. It is mainly divided into two categories: sintered NdFeB and bonded NdFeB. Since the 1990s, with the strong demand of the computer-based information industry, isotropic rigid bonded NdFeB magnets represented by quick-quenched NdFeB magnets have been widely used. [0003] In the past, the processing methods of isotropic bonded NdFeB magnets mostly used hard plastics, resins, etc. Rigid, brittle, and inflexible, and products of different specifications are produced by molding and injection molding processe...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F1/08H01F7/02H01F41/02B22F1/02
CPCH01F41/0266H01F1/0572H01F1/0578H01F1/09H01F7/0215
Inventor 汪小明杨应彬戴雨兰饶钦盛罗毅张科元
Owner GUANGZHOU GOLDEN SOUTH MAGNETIC MATERIAL
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