A bonded NdFeB magnet and its preparation method

A NdFeB, magnet technology, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of easy cracking density, unevenness, etc., to reduce product cracking, reduce density unevenness, improve The effect of yield and market competitiveness

Active Publication Date: 2017-03-29
HUNAN AEROSPACE MAGNET & MAGNETO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The further technical problem to be solved by the present invention is to provide a product that can solve the problems of easy cracking and uneven density during the molding process of products with large size, that is, large pressed cross-sectional area and height, and can improve the product qualification rate and reduce production costs. Preparation method of bonded NdFeB magnet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Bonded NdFeB magnet: 95 wt% NdFeB magnetic powder, 1.5 wt% antioxidant (nano-aluminum powder), 3 wt% thermosetting binder (bisphenol A epoxy resin and dicyandiamide curing agent), lubricated agent (zinc stearate and molybdenum disulfide) 0.5 wt%.

[0029] Preparation method of bonded NdFeB magnet:

[0030] (1) Crush the NdFeB magnetic powder and pass it through a 100-mesh sieve; (2) Add 28.5kg of sieved NdFeB magnetic powder and 0.45kg of nano-aluminum powder to dissolve 0.9kg of commercially available thermosetting binder W-6C ( Bisphenol A epoxy resin and dicyandiamide curing agent) in acetone, stir to make the acetone completely volatilize to obtain rubber powder; (3) mix the rubber powder with 0.15g lubricant (0.135kg zinc stearate and 0.015kg disulfide Molybdenum mixture) mixed evenly to obtain a magnetic powder mixture; (4) According to the size of the pressed product (the cross-sectional area is 20cm 2 , height 35mm) and density requirements (density up to 6.2g...

Embodiment 2

[0034] Bonded NdFeB magnet: 97 wt% NdFeB magnetic powder, 0.1 wt% antioxidant (nano carbon powder), 2.8 wt% thermosetting binder (bisphenol A epoxy resin and dicyandiamide curing agent), lubricated agent (zinc stearate and molybdenum disulfide) 0.1 wt%.

[0035] Preparation method of bonded NdFeB magnet:

[0036](1) Crush the NdFeB magnetic powder and pass it through a 100-mesh sieve; (2) Add 9.7kg of sieved NdFeB magnetic powder and 0.01kg of nano-carbon powder to dissolve 0.28kg of commercially available thermosetting binder W-6C ( Bisphenol A epoxy resin and dicyandiamide curing agent) in acetone, stir to make the acetone completely volatilize to obtain rubber powder; (3) mix the rubber powder with 0.01g lubricant (0.009kg zinc stearate and 0.001kg disulfide Molybdenum mixture) mixed evenly to obtain a magnetic powder mixture; (4) according to the size of the pressed product (the cross-sectional area is 18cm 2 , height 50mm) and density requirements (density up to 6.3g / cm...

Embodiment 3

[0040] Bonded NdFeB magnet: 96.8 wt% NdFeB magnetic powder, 1.3 wt% antioxidant (nano-aluminum powder and carbon powder), 1.5 wt% thermosetting adhesive (bisphenol A epoxy resin and dicyandiamide curing agent) %, lubricant (zinc stearate and molybdenum disulfide) 0.4 wt%.

[0041] Preparation method of bonded NdFeB magnet:

[0042] (1) After crushing the NdFeB magnetic powder, pass through 160 mesh and 320 mesh sieves (take the magnetic powder between 160 and 320 mesh); (2) Mix 9.68kg of NdFeB magnetic powder with 0.13kg kg nanometer aluminum powder and 0.032kg carbon powder mixture) into the acetone of 0.15kg commercially available thermosetting binder W-6C (bisphenol A epoxy resin and dicyandiamide curing agent) after dissolving, stir to volatilize the acetone to obtain Rubber powder; (3) Mix rubber powder with 0.04kg lubricant (a mixture of 0.036kg zinc stearate and 0.004kg molybdenum disulfide) to obtain a magnetic powder mixture; (4) According to the size of the pressed ...

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Abstract

The invention relates to a bonded Nd-Fe-B magnet and a manufacturing method of the bonded Nd-Fe-B magnet. The bonded Nd-Fe-B magnet is composed of Nd-Fe-B magnetic powder, an antioxidant, a thermoset binding agent and lubricant. The manufacturing method includes the following steps that (1), the Nd-Fe-B magnetic powder is crushed and screened; (2), the Nd-Fe-B magnetic powder and the antioxidant are added into acetone which the thermoset binding agent is dissolved in, and the mixture is stirred until the acetone is fully volatilized to obtain gelatine powder; (3), the gelatin powder and the lubricant are mixed to obtain a mixed magnetic powder; (4), the magnetic powder mixture is pressed several times to obtain a magnet green body; (5), the magnet green body is heated and solidified to obtain the bonded Nd-Fe-B magnet. The bonded Nd-Fe-B magnet has the advantages of being high in density, good in uniformity, high in oxidation resistance and the like. According to the manufacturing method, magnetic powder crushing and pressing in several times are adopted to solve the problems that in the forming process, the large-size bonded Nd-Fe-B magnet is prone to cracking, corners are prone to falling off, and the density is not uniform, the qualified rate of the bonded Nd-Fe-B magnet is increased, and production cost is reduced.

Description

technical field [0001] The invention relates to a neodymium-iron-boron magnet and a preparation method thereof, in particular to a bonded neodymium-iron-boron magnet and a preparation method thereof. Background technique [0002] Bonded NdFeB has the advantages of good formability, high dimensional accuracy, good uniformity of magnetic properties, large degree of freedom in shape, and low production energy consumption. It is widely used in computers, electronic technology, household appliances, office supplies, automobiles and other fields. . [0003] The bonded NdFeB magnets prepared by molding have large differences in product density according to different application fields, and the lowest density is only 5.5g / cm 3 , the density is as high as 6.3g / cm 3 , since the magnetic properties are proportional to the product density, for products with high magnetic properties, the density generally needs to reach 6.2 g / cm 3 The above can meet the requirements. In order to incr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F1/08H01F41/02B22F3/02
Inventor 谭春林李彬胡盛青周朝辉向芳
Owner HUNAN AEROSPACE MAGNET & MAGNETO
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