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Magnetic core sintering process

A process and magnetic core technology, applied in the field of magnetic core manufacturing technology, can solve the problems of low oxygen content, no inductance, magnetic core oxidation, etc., and achieve fine product cross-section, good product performance consistency, and good appearance consistency. Effect

Active Publication Date: 2013-05-08
博兴兴博城建投资集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The defect of this production process is: the oxygen content in the sintering furnace is difficult to control, and it is easy to produce the situation that the oxygen content is too low or too high
When the oxygen content in the sintering furnace is too low, it is easy to cause product defects such as reduction, brittleness, and no inductance of the magnetic core; when the oxygen content is too high, it is easy to cause product defects such as oxidation and brittleness of the magnetic core

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: For a magnetic core whose magnetic core material is manganese zinc ferrite 12K powder, the model is T16*12*8, and the inductance requirement is 6.5K. The sintering process is: including heating process, heat preservation process and cooling process; the heating process includes: placing the magnetic core in the tested sintering furnace, heating to the temperature in the sintering furnace for 12 hours to 650°C, and heating to The temperature in the sintering furnace is 920°C. After 2.2 hours, it is heated to 1150°C in the sintering furnace, and then heated to the final sintering temperature of 1420°C in the sintering furnace after 3 hours; the heat preservation process is to hold at the final sintering temperature for 5.5 hours; the cooling process includes : Close the door of the sintering furnace, check for no air leakage and measure the temperature in the sintering furnace to be 1280°C, perform the first nitrogen replacement for 12 minutes until the oxyge...

Embodiment 2

[0015] Embodiment 2: For a magnetic core whose magnetic core material is manganese-zinc ferrite 10K powder, model T14*8*7, and inductance requirement 7K, the sintering process is: including heating process, heat preservation process and cooling process; heating process Including: the magnetic core is placed in the tested sintering furnace, heated to 640°C in the sintering furnace after 11 hours, heated to 910°C in the sintering furnace after 2.9 hours, and heated to the temperature in the sintering furnace after 2.4 hours 1140°C, and then heated to the final sintering temperature of 1400°C in the sintering furnace after 3.1 hours; the heat preservation process is to keep the temperature at the final sintering temperature for 6.5 hours; the cooling process includes: closing the sintering furnace door, detecting no air leakage and measuring the temperature in the sintering furnace When the temperature is 1290°C, perform the first nitrogen replacement for 12 minutes until the oxyg...

Embodiment 3

[0017] Embodiment 3: For a magnetic core whose magnetic core material is manganese-zinc ferrite 12K powder, the model is T18*10*7, and the inductance requirement is 10K, the sintering process is: including a heating process, a heat preservation process and a cooling process; the heating process Including: the magnetic core is placed in the tested sintering furnace, heated to 630°C in the sintering furnace after 10.5 hours, heated to 900°C in the sintering furnace after 3 hours, and heated to the temperature in the sintering furnace after 2.5 hours 1100°C, and then heated to the final sintering temperature of 1425°C in the sintering furnace after 3.2 hours; the heat preservation process is to keep the temperature at the final sintering temperature for 5.8 hours; the cooling process includes: closing the sintering furnace door, detecting no air leakage and measuring the temperature in the sintering furnace When the temperature in the sintering furnace is 1270°C, carry out the fir...

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PUM

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Abstract

The invention discloses a magnetic core sintering process which relates to the technical field of manufacturing of electronic components, and comprises a temperature rising process, a heat preservation process and a temperature reduction process; the temperature reduction process includes a secondary nitrogen replacement process, and nitrogen is charged all the time in the temperature reduction process and the nitrogen replacement process to keep the air pressure in a sintering furnace to be not lower than 2MPa. As the sintering process is adopted, compared with the prior art, the invention has the advantages that the appearance consistency of the surface of a product after sintering is good, the section of the product is fine and smooth, large crystals do not exist, oxidation and reduction phenomena do not exist, and the consistency of production performance is good.

Description

technical field [0001] The invention relates to the technical field of electronic component manufacturing, in particular to a manufacturing process of a magnetic core. Background technique [0002] In the magnetic core sintering process in the prior art, a vacuum pump is usually used to extract the oxygen in the sintering furnace to prevent oxidation and reduction of the magnetic core during the sintering process. The defect of this production process is: the oxygen content in the sintering furnace is difficult to control, and it is easy to produce the situation that the oxygen content is too low or too high. When the oxygen content in the sintering furnace is too low, it is easy to cause product defects such as reduction, brittleness, and non-inductance of the magnetic core; when the oxygen content is too high, it is easy to cause product defects such as oxidation and brittleness of the magnetic core. Contents of the invention [0003] The purpose of the present inventio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/64
Inventor 徐本文
Owner 博兴兴博城建投资集团有限公司