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Magnetic core sintering process

A process and magnetic core technology, applied in the field of magnetic core manufacturing process, can solve problems such as low oxygen content, magnetic core oxidation, magnetic core reduction, etc., to achieve good product performance consistency, fine product cross-section, and good appearance consistency Effect

Active Publication Date: 2011-10-19
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] Example 1: For the magnetic core material is Mn-Zn ferrite 12K powder, the model is T16*12*8, and the inductance requirement is 6.5K. The sintering process includes: heating process, heat preservation process and cooling process; heating process includes: placing the magnetic core in the tested sintering furnace, heating to 650℃ in the sintering furnace in 12 hours, 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. After 3 hours, it is heated to the final sintering temperature of 1420°C in the sintering furnace. The heat preservation process is 5.5 hours at the final sintering temperature; the cooling process includes : Close the door of the sintering furnace, check that there is no air leakage and determine that the temperature in the sintering furnace is 1280 ℃, perform the first nitrogen replacement for 12 minutes, until the oxygen content in the sintering furnace is less than 1.5%, when ...

Embodiment 2

[0015] Example 2: For the magnetic core material of 10K manganese-zinc ferrite powder, the model is T14*8*7, and the inductance requirement is 7K, the sintering process includes: heating process, heat preservation process and cooling process; heating process Including: the magnetic core is placed in the tested sintering furnace, heated to 640℃ in the sintering furnace in 11 hours, heated to 910℃ in the sintering furnace in 2.9 hours, and heated to the temperature in the sintering furnace in 2.4 hours 1140℃, and then heating for 3.1 hours to the final sintering temperature of 1400℃ in the sintering furnace; the heat preservation process is 6.5 hours at the final sintering temperature; the cooling process includes: closing the sintering furnace door, detecting no air leakage and measuring the temperature in the sintering furnace When it is 1290℃, perform the first nitrogen replacement for 12 minutes until the oxygen content in the sintering furnace is less than 1.5%. When the temp...

Embodiment 3

[0017] Example 3: For the magnetic core material of Mn-Zn ferrite 12K powder, the model is T18*10*7, and the inductance requirement is 10K, the sintering process includes: heating process, heat preservation process and cooling process; heating process Including: the magnetic core is placed in the sintering furnace after testing, heated to 630℃ in the sintering furnace in 10.5 hours, heated to 900℃ in the sintering furnace in 3 hours, and heated to the temperature in the sintering furnace in 2.5 hours 1100℃, and then heating for 3.2 hours to the final sintering temperature of 1425℃ in the sintering furnace; the heat preservation process is 5.8 hours at the final sintering temperature; the cooling process includes: closing the sintering furnace door, detecting no air leakage, and measuring the temperature in the sintering furnace At 1270°C, perform the first nitrogen replacement for 11 minutes until the oxygen content in the sintering furnace is less than 1.5%. When the temperatur...

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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] The core sintering process in the prior art usually uses a vacuum pump to extract oxygen from the sintering furnace to prevent oxidation and reduction of the core during the sintering process. The disadvantage of this production process is that the oxygen content in the sintering furnace is difficult to control, and the oxygen content is likely to be 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 oxidation and brittle product defects of the magnetic core. Summary of the invention [0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a m...

Claims

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Application Information

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