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A kind of preparation method of high-density and high-stability network small magnetic ring

A high-stability, high-density technology, applied in the field of soft magnetic materials, can solve problems such as large inductance changes and inductance value drop due to stress, and achieve the effects of reducing core stress, shortening subsequent sintering time, and shortening sintering temperature

Active Publication Date: 2018-11-16
重庆正峰电子技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem in reality is that during the processing of network transformers, the magnetic core is often subjected to three external stresses: the pressure of the parylene insulation layer, the extrusion force of the coil, the pressure of the varnish and the silicone when the coil is fixed, and the magnetic core is subjected to three external stresses. The ring is very small and the inductance changes greatly due to the influence of external force
The commonly used iron core model is R10kH2.54*1.40*0.76. After packaging, the inductance value at 0°C is affected by the stress and drops significantly, which cannot meet the test conditions of 24 turns. The inductance value L S Greater than 350µH required

Method used

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  • A kind of preparation method of high-density and high-stability network small magnetic ring
  • A kind of preparation method of high-density and high-stability network small magnetic ring
  • A kind of preparation method of high-density and high-stability network small magnetic ring

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The magnetic core blank formed by dry pressing, the iron core model selected in this embodiment is R10KH2.54*1.40*0.76, is placed in a vertical furnace and sintered in three stages, and the sintering temperature is raised from room temperature to 780 ℃, 820℃, 860℃, 900℃, respectively recorded as samples 1~4, all kept at the corresponding temperature for 1.5 hours, the following treatment methods were the same for the four samples, and finally the temperature was lowered to below 100℃ after 4.5 hours .

[0023] Take the pre-sintered magnetic core and put it into a grinder, and at the same time add grinding medium balls of the same material as the magnetic core to the grinder for grinding. The weight percentage of the magnetic core and the grinding medium ball is 1:6, the speed of the grinder is 20 rpm, and the grinding time is 1 hour. Clean the dust and sundries on the surface of the ground magnetic core with hot water at 80-99°C, and put the rinsed magnetic core into a...

Embodiment 2

[0037] The magnetic core blank formed by dry pressing, the iron core model selected in this embodiment is R10KH2.54*1.40*0.76, and the test of 4 identical samples is carried out at the same time, recorded as samples 5-8, placed in a vertical furnace and divided into three For sintering in three stages, the sintering temperature was increased from room temperature to 820°C over 5 hours, kept at 820°C for 1.5 hours, and finally the temperature was lowered to below 100°C after 4.5 hours.

[0038] Take the pre-sintered magnetic core and put it into a grinder, and at the same time add grinding medium balls of the same material as the magnetic core to the grinder for grinding. The weight percentage of the magnetic core and the grinding medium ball is 1:6, the speed of the grinder is 20 rpm, and the grinding time is 1 hour.

[0039] Clean the dust and debris on the surface of the ground magnetic core with hot water at 80-99°C, and put the rinsed magnetic core into an oven to bake to ...

Embodiment 3

[0052] The magnetic core blank formed by dry pressing, the iron core model selected in this embodiment is R10KH2.54*1.40*0.76, and the test of 4 identical samples is carried out at the same time, recorded as samples 9-12, placed in a vertical furnace and divided into three For sintering in three stages, the sintering temperature was increased from room temperature to 820°C over 5 hours, kept at 820°C for 1.5 hours, and finally the temperature was lowered to below 100°C after 4.5 hours.

[0053] Take the pre-sintered magnetic core and put it into a grinder, and at the same time add grinding medium balls of the same material as the magnetic core to the grinder for grinding. The weight percentage of the magnetic core and the grinding medium ball is 1:6, the speed of the grinder is 20 rpm, and the grinding time is 1 hour. Clean the dust and debris on the surface of the ground magnetic core with hot water at 80-99°C, and put the rinsed magnetic core into an oven to bake to remove w...

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Abstract

The invention relates to a soft magnetic material, in particular to a preparation method of a high-density and high-stability small network magnet ring. The preparation method comprises the steps of presintering, grinding, sintering, coating and coiling, wherein the presintering comprises the step of sintering a magnet core blank formed by dry pressing in a vertical furnace in three stages, namely increasing the sintering temperature from the room temperature to 780-920 DEG C by 4-6h, performing keeping for 1-2h at 780-920 DEG C, and finally reducing the temperature to be below 100 DEG C by 3-5h. With the adoption of the scheme, the preparation method of the high-density and high-stability small network magnet ring has the advantages of high density, high stability and low stress.

Description

technical field [0001] The invention relates to the technical field of soft magnetic materials, in particular to a method for preparing a high-density and high-stability network small magnetic ring. Background technique [0002] In order to meet the needs of smaller size, lower power consumption and lower cost of devices, various technologies are used in the process of manufacturing magnetic components. By changing the component dimensions, modularizing magnetic components and integrating magnetic components into connectors have become three basic technologies. ADSL network communication transformers are low-power linear transformers. It is mainly used in low-power, small-signal circuits, and its requirements are high conversion efficiency, low distortion, and small size. In order to meet these requirements, the transformer magnetic core usually adopts high magnetic permeability MnZn ferrite material, which requires the material to have a high magnetic permeability μi of 7...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02B22F3/10
CPCB22F3/101B22F3/1017H01F41/0246
Inventor 郝利军
Owner 重庆正峰电子技术有限公司