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Ferrite bead and preparation method thereof

A ferrite bead and ferrite material technology, which is applied in the manufacture of inductors/transformers/magnets, electrical components, inductors, etc., can solve problems such as product short circuit, poor appearance of magnetic bead products, and low production efficiency. Effects of improved appearance, low processing cost, and high appearance pass rate

Active Publication Date: 2017-06-09
SHENZHEN SUNLORD ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the existing high-permeability ferrite bead products, in the electroplating process, in addition to depositing on the electrodes at both ends of the magnet, the coating will also extend to the magnet part of the magnetic bead product, resulting in poor appearance of the magnetic bead product and product failure. Short circuit, etc.
For such products with poor appearance, at present, the poor penetration and plating products are mainly removed by manual or machine selection, which leads to low production efficiency

Method used

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  • Ferrite bead and preparation method thereof
  • Ferrite bead and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0021] The preparation method of the ferrite bead of this specific embodiment comprises the following steps:

[0022] S1, preparing a semi-finished ferrite bead, in which a magnet is sintered from a ferrite material, and a silver electrode is arranged on the magnet.

[0023] S2, putting the ferrite bead semi-finished product into a furnace with an oxygen volume fraction of 60%-95% for high-temperature treatment at a temperature of 400°C-600°C for 2h-10h, and cooling in the furnace after the treatment.

[0024] Based on the ferrite material, there may be a problem of incomplete sintering during the sintering process, resulting in metal particles on the surface of the magnet, and then the surface material is improved through the high-temperature furnace treatment process in step S2. The conversion efficiency of the metal particles on the surface of the magnet in the semi-finished magnetic beads into metal oxides is low. When the oxygen atmosphere is added when returning to the f...

experiment example 1

[0034] Prepare the semi-finished ferrite bead, and spread the semi-finished product on the silicon carbide saggar. Put the semi-finished silicon carbide sagger into the bell furnace. After sealing, vacuumize the furnace so that the pressure in the furnace is -50KPa, and then fill the gas with an oxygen content of 60%. After the oxygen is introduced, the pressure in the furnace is maintained at 2Kpa. Start the heating program, heat to 400°C within 1h, and then heat treat at this temperature for 2h. After the treatment, cool down with the furnace. Electroplating is carried out on the processed magnetic bead semi-finished product, and a metal plating layer is deposited on the electrode of the magnetic bead semi-finished product to obtain a ferrite magnetic bead.

[0035] Test the appearance effect and appearance qualification rate of the same batch of ferrite beads produced, and the test results are shown in the table below.

experiment example 2

[0037] Prepare ferrite bead semi-finished products, and place the semi-finished products on the anti-mouth bowl made of alumina in a stacked and superimposed manner. Put the semi-finished aluminum oxide anti-bowl into the bell furnace. After sealing, vacuumize the pressure in the furnace to -120KPa, then fill in the gas with an oxygen content of 95%, and make the pressure in the furnace Keep it at 5KPa. Start the heating program, heat to 600°C within 2h, and then heat treat at this temperature for 10h. After heat treatment, cool down with the furnace. Electroplating is carried out on the processed magnetic bead semi-finished product, and a metal plating layer is deposited on the electrode of the magnetic bead semi-finished product to obtain a ferrite magnetic bead.

[0038] Test the appearance effect and appearance qualification rate of the same batch of ferrite beads produced, and the test results are shown in the table below.

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Abstract

The invention discloses a ferrite bead and a preparation method thereof. The method for preparing the ferrite bead comprises the following steps: S1, preparing a ferrite bead semi-finished product, wherein a magnet in the ferrite bead semi-finished product is formed by sintering a ferrite material, and a silver electrode is arranged on the magnet; S2, performing high-temperature treatment on the ferrite bead semi-finished product in a furnace with the oxygen volume fraction being 60-95% at the temperature of 400-600 DEG C for 2-10 hours, and performing furnace cooling after treatment is ended; and S3, performing electroplating treatment on the ferrite bead semi-finished product treated in S2, and depositing a metal coating on the electrode of the ferrite bead semi-finished product, thereby obtaining the ferrite bead. According to the preparation method disclosed by the invention, the appearance yield of the prepared product can be improved, and the manufacturing cost is low.

Description

[0001] 【Technical field】 [0002] The invention relates to a preparation process of ferrite magnetic beads. [0003] 【Background technique】 [0004] In the existing high-permeability ferrite bead products, in the electroplating process, in addition to depositing on the electrodes at both ends of the magnet, the coating will also extend to the magnet part of the magnetic bead product, resulting in poor appearance of the magnetic bead product and product failure. short circuit etc. For such products with poor appearance, at present, the poor penetration and plating products are mainly removed by manual or machine selection, which leads to low production efficiency. [0005] 【Content of invention】 [0006] The technical problem to be solved by the present invention is to make up for the above-mentioned deficiencies in the prior art, and propose a ferrite magnetic bead and a preparation method thereof, which can improve the appearance pass rate of the obtained product, and the ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F17/00H01F41/00
CPCH01F17/00H01F41/00
Inventor 许光李美帆
Owner SHENZHEN SUNLORD ELECTRONICS
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