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Preparation process of a high-performance small-size high-thickness ratio electroplated bonded magnet

A preparation process and bonded magnet technology, applied in the direction of inductance/transformer/magnet manufacturing, magnetic objects, circuits, etc., can solve problems such as drop-off corners, large magnetic performance drop, easy to rust, etc., to facilitate mass production and easy process Effect of controlling and inhibiting heterogeneous nucleation

Active Publication Date: 2017-10-13
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the problem that when the existing bonded NdFeB magnetic powder is pressed into a small-sized, high-thickness ratio magnetic ring, the product is prone to cracking, corner drop, large difference in density between top and bottom, large size fluctuations, poor corrosion resistance, easy to rust, and magnetic performance decline. To provide a preparation process for high-performance, small-size, high-thickness ratio electroplating bonded magnets with small surface porosity, good electrical conductivity, good flow performance, and high magnetic flux

Method used

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  • Preparation process of a high-performance small-size high-thickness ratio electroplated bonded magnet
  • Preparation process of a high-performance small-size high-thickness ratio electroplated bonded magnet
  • Preparation process of a high-performance small-size high-thickness ratio electroplated bonded magnet

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Effect test

Embodiment 1

[0024] A preparation process of a high-performance small-size high-thickness ratio electroplated bonded magnet, the preparation process includes the following steps:

[0025] 1. According to the formula of Nd:Fe:B:Co=69:23.2:1:1.8 (wt%), the NdFeB magnetic powder is obtained through a rapid quenching process and the magnetic properties are tested;

[0026] 2. The magnetic powder is sieved with 100 mesh, 150 mesh, 200 mesh, 250 mesh and 325 mesh;

[0027] 3. Weigh and mix the magnetic powder according to the following mass ratio (100-150 mesh): (150-200 mesh): (200-250 mesh): (250-325 mesh): 325 mesh or more = 11.5:2.8:0.8:2.9 :1.2;

[0028] 4. Press epoxy resin: dicyandiamide: KH-550 coupling agent: seaweed extract=80:17.5:1.5:1 (wt%) formula, make magnetic powder glue; The preparation method of described algae extract is: According to the number of parts by mass, 200 parts of Trichoderma, 120 parts of Thalassiosira wilsonii and 700 parts of Chlorococcus viridis are washed a...

Embodiment 2

[0037] A preparation process of a high-performance small-size high-thickness ratio electroplated bonded magnet, the preparation process includes the following steps:

[0038] 1. According to the formula of Nd:Fe:B:Co=69:23.3:1:1.7 (wt%), the NdFeB magnetic powder is obtained through the rapid quenching process and the magnetic properties are tested;

[0039] 2. The magnetic powder is sieved with 100 mesh, 150 mesh, 200 mesh, 250 mesh and 325 mesh;

[0040] 3. Weigh and mix the magnetic powder according to the following mass ratio (100-150 mesh): (150-200 mesh): (200-250 mesh): (250-325 mesh): 325 mesh or more = 12.1:3.1:0.9:2.9 :1.1;

[0041]4. Press epoxy resin: dicyandiamide: KH-550 coupling agent: seaweed extract=80:17:2:1 (wt%) formula, make magnetic powder glue; The preparation method of described algae extract is: According to the number of parts by mass, 200 parts of Trichoderma, 120 parts of Thalassiosira wilsonii and 700 parts of Chlorococcus viridis are washed and ...

Embodiment 3

[0049] A preparation process of a high-performance small-size high-thickness ratio electroplated bonded magnet, the preparation process includes the following steps:

[0050] 1. According to the formula of Nd:Fe:B:Co=69:23.1:1:1.9 (wt%), the NdFeB magnetic powder is obtained through the rapid quenching process and the magnetic properties are tested;

[0051] 2. The magnetic powder is sieved with 100 mesh, 150 mesh, 200 mesh, 250 mesh and 325 mesh;

[0052] 3. Weigh and mix the magnetic powder according to the following mass ratio (100-150 mesh): (150-200 mesh): (200-250 mesh): (250-325 mesh): 325 mesh or more = 11.8:3.2:1.2:3.2 :0.8;

[0053] 4. Press epoxy resin: dicyandiamide: KH-550 coupling agent: seaweed extract=80:16.8:2.2:1 (wt%) formula, make magnetic powder glue; The preparation method of described algae extract is: According to the number of parts by mass, 200 parts of Trichoderma, 120 parts of Thalassiosira wilsonii and 700 parts of Chlorococcus viridis are washed...

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Abstract

The invention relates to a preparation process of a high-performance, small-size, high-thickness ratio electroplating bonded magnet. The preparation process includes the following steps: Nd, Fe, B and Co are prepared through a rapid quenching process to obtain a rough NdFeB magnetic powder, and the Epoxy resin, dicyandiamide, coupling agent and additives are mixed to make magnetic powder glue, the semi-finished magnetic powder is mixed with magnetic powder glue, and the magnetic ring is pressed according to the standard molding pressure of 10-12T / cm2 Φ17.4mm×Φ15.5mm×3.5 mm, the extruded product is chamfered by dry method. In the process of rapid quenching of the melt, the invention is beneficial to suppress heterogeneous nucleation, control the rapid growth of crystal grains, and form uniform and fine soft magnetic phase and hard magnetic phase grains; the process is simple, the process is easy to control, the cost is low, and the forming Easy, easy to produce high-density magnet products of various shapes according to the needs of use, and it is convenient for mass production.

Description

technical field [0001] The invention relates to the field of magnetic components, in particular to a preparation process of a high-performance, small-size, high-thickness ratio electroplating bonded magnet with small surface porosity, good electrical conductivity, good fluidity, and high magnetic flux. Background technique [0002] Neodymium iron boron, simply speaking, is a kind of magnet. The difference from the magnets we usually see is that it is called the "magnet king" because of its excellent magnetic properties. NdFeB contains a large amount of rare earth elements neodymium, iron and boron, and its characteristics are hard and brittle. Since the surface is easily oxidized and corroded, NdFeB must be surface coated. Surface chemical passivation is one of the good solutions. As a kind of rare earth permanent magnet material, NdFeB has extremely high magnetic energy product and coercive force. At the same time, the advantages of high energy density make NdFeB permanen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02H01F1/057B22F1/00
CPCH01F1/0571H01F41/0266B22F1/10
Inventor 应晓东
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD