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Preparation process of ferrite and neodymium iron boron (NdFeB) composite bonded magnet

A bonded magnet and preparation technology, which is applied in the field of magnetic material manufacturing, can solve the problems of poor product performance consistency, cracking, low strength, etc., and achieve the effect of good consistency and magnetic performance, simple process steps, and strong operability

Active Publication Date: 2017-01-18
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) The ferrite powder is spherical, with an average particle size of 0.8-6um, while the NdFeB powder is scaly, with an average particle size of 20-35um. The two kinds of magnetic powders are mixed unevenly, which makes the performance of the mixed product poor in consistency; at the same time, the material is molded , the density is low, only 3.5-5g / cm3, the strength is low, and the product is easy to chip and crack;
[0006] (2) When using the conventional electrophoresis process to carry out anti-corrosion treatment on the product, due to the non-conductivity of ferrite, the anti-corrosion coating on the surface of the product is uneven, and the product is easy to rust

Method used

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  • Preparation process of ferrite and neodymium iron boron (NdFeB) composite bonded magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) After ball milling and drying strontium red ferrite, mix it evenly with NdFeB magnetic powder to obtain a mixture. The mass ratio of strontium red ferrite material to NdFeB magnetic powder is controlled at 1:9, strontium red iron The oxygen body is ball milled to a particle size of 25 μm, and the particle size of the NdFeB magnetic powder is 25 μm;

[0026] (2) After dissolving W-6C epoxy resin in acetone, add the mixture and stir evenly, and dry it stably at 50°C. The mass ratio of W-6C epoxy resin to mixture is 2:100;

[0027] (3) Add the dried material to the crushing and vibrating screen machine and crush it through a 100-mesh sieve. After being pressed into a magnetic ring, use epoxy resin paint EP-703 to paint on the surface. The thickness of the paint is 0.03mm, and it is dried at 150°C The product is obtained in 30-min.

Embodiment 2

[0029] (1) After ball milling and drying strontium red ferrite, mix it evenly with NdFeB magnetic powder to obtain a mixture. The mass ratio of strontium red ferrite material to NdFeB magnetic powder is controlled at 1:4, strontium red iron The oxygen body is ball milled to a particle size of 27 μm, and the particle size of NdFeB magnetic powder is 30 μm;

[0030] (2) After dissolving W-6C epoxy resin in acetone, add the mixture and stir evenly, and dry it stably at 55°C. The mass ratio of W-6C epoxy resin to mixture is 2.5:100;

[0031] (3) Add the dried material to the crushing and vibrating screen machine and crush it through a 100-mesh sieve. After being pressed into a magnetic ring, use epoxy resin paint EP-703 to spray paint on the surface. The product is ready in 40 minutes.

Embodiment 3

[0033] (1) After ball milling and drying strontium red ferrite, mix it evenly with NdFeB magnetic powder to obtain a mixture. The mass ratio of strontium red ferrite material to NdFeB magnetic powder is controlled at 1:1, strontium red iron The oxygen body is ball milled to a particle size of 35 μm, and the particle size of the NdFeB magnetic powder is 35 μm;

[0034] (2) After dissolving W-6C epoxy resin in acetone, add the mixture and stir evenly, and dry it stably at 60°C. The mass ratio of W-6C epoxy resin to mixture is 3:100;

[0035] (3) Add the dried material to the crushing and vibrating screen machine and crush it through a 100-mesh sieve, press it into a magnetic ring, and then spray paint on the surface with epoxy resin paint EP-703. The product was obtained in 60 minutes.

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Abstract

The invention discloses a preparation process of a ferrite and neodymium iron boron (NdFeB) composite bonded magnet. The preparation process comprises the following specific steps: (1) ball-milling strontium ferrite, drying, uniformly mixing with neodymium iron boron magnetic powder and obtaining a mixture, wherein the mass ratio of the strontium ferrite to the neodymium iron boron magnetic powder is controlled to be 1:(1-9); (2) dissolving W-6C epoxy resin in acetone, adding the mixture, uniformly stirring and drying, wherein the mass ratio of the W-6C epoxy resin to the mixture is (2-3):100; (3) adding a dried material into a crushing and screen vibrating machine for crushing and screening, pressing into a magnetic ring, spraying paint on the surface and drying to obtain the product. The preparation process disclosed by the invention is simple in step, strong in maneuverability, low in product cost, good in consistency and magnetic property and low in rusting probability.

Description

technical field [0001] The invention relates to the technical field of magnetic material manufacture, in particular to a preparation process of a ferrite and neodymium-iron-boron composite bonded magnet. Background technique [0002] The maximum magnetic energy product (BH)max of the lowest performance bonded NdFeB magnetic powder reaches 6MGOe, while the maximum magnetic energy product (BH)max of the highest performance sintered permanent magnet ferrite can only reach 4.5MGOe, so use pure bonded NdFeB magnetic powder When it is used instead of permanent magnet ferrite material, the magnetic performance will be wasted. [0003] At present, the price of bonded NdFeB magnetic powder is 100,000-300,000 / ton, compared with 0.3-7,000 / ton for ferrite magnets. Bonded NdFeB magnetic powder is too expensive compared to permanent ferrite materials, which greatly limits the promotion and application of bonded NdFeB. [0004] Through the substitution of raw materials, on the premise of...

Claims

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Application Information

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IPC IPC(8): H01F1/09H01F41/02
CPCH01F1/09H01F41/026H01F41/0266
Inventor 应晓东
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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