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A double sintering process for high permeability ferrite to increase initial permeability

A technology with initial magnetic permeability and high magnetic permeability, which is applied in the direction of magnetic objects, magnetic materials, inorganic materials, etc., and can solve problems such as low inductance and economic loss of enterprises

Active Publication Date: 2020-07-28
ZHEJIANG CHUNHUI MAGNETOELECTRICITY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] High permeability ferrite products (above 5K) often have a lot of unqualified products whose inductance is lower than the requirement or the batch inductance value is lower than the requirement after one-time sintering. If the unqualified products are scrapped, the enterprise will cause Great economic loss. The new technology of double sintering was not used before, and the loss exceeded one million yuan every year.

Method used

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  • A double sintering process for high permeability ferrite to increase initial permeability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The primary sintering of RH7K (38*19*13) includes the following steps: kiln installation, 6.5h debinding section to raise the temperature from room temperature to 450°C, 7.5h heating section to raise the temperature from 450°C to 1390°C, heat preservation section Insulate at 1390°C for 5.0h, in the cooling stage, the oxygen content is 0.1% at 1050°C, 0.15% at 1060°C, 0.45% at 1080°C; 0.65% at 1110°C, and the cooling time is 9.0h. Reload the unqualified products whose inductance coefficient is less than 25% of the standard, and reinstall the kiln. The temperature in the debinding section will be raised from room temperature to 450°C in 6.5 hours, the temperature in the heating section will be raised from 450°C to 1400°C in 7.5 hours, and the temperature in the heat preservation section will be 1400°C. In the cooling stage, the oxygen content is 0.1% at 1050°C, 0.35% at 1060°C, 0.65% at 1080°C, and 0.85% at 1110°C. The cooling time is 9.0h.

Embodiment 2

[0026] The primary sintering of RH10K (38*24*22) includes the following steps: kiln installation, 6.5 hours in the debinding section to raise the temperature from room temperature to 450°C, 7.5 hours to raise the temperature from 450°C to 1400°C in the heat preservation section Insulate at 1400°C for 5.0h, in the cooling stage, the oxygen content is 0.1% at 1050°C, 0.15% at 1060°C, 0.45% at 1080°C; 0.65% at 1110°C, and the cooling time is 9.0h. Put the unqualified products whose inductance coefficient exceeds the standard within 25% into the kiln again. In the glue discharge section, the temperature will rise from room temperature to 450°C in 6.5 hours, and the temperature will rise from 450°C to 1410°C in the heating section for 7.5 hours, and the temperature in the heat preservation section will be 1410°C. In the cooling stage, the oxygen content is 0.1% at 1050°C, 0.35% at 1060°C, 0.65% at 1080°C, and 0.85% at 1110°C. The cooling time is 9.0h.

example 1、2

[0027] Example 1, 2 (Inductance coefficient unit: nH / N2. Test conditions: f=1KHz; N=10Ts; T=25±3℃)

[0028]

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Abstract

The invention discloses a two-time-sintering process for increasing initial permeability of a high-permeability ferrite. After the high-permeability ferrite is sintered for the first time, unqualified products with inductance coefficient within 25% below the lowest standard value, and the second sintering process includes: 1) placing the unqualified products with the inductance coefficient within 25% below the lowest standard value into a kiln again; 2) discharging rubber: raising a room temperature to 450 DEG C for 6.5 hours; 3) heating: raising the temperature from 450 DEG C to a higher temperature for 7.5 hours; 4) keeping the temperature: to increase the inductance coefficient by 12.5% for each time, the temperature is raised by 5 DEG C as compared with that in the temperature keeping step in the primary sintering time, and the high temperature is kept for 5.0 hours; 5) cooling for 9.0 hours: the oxygen content at the temperature of 1060-1110 DEG C is increased by 0.2% as compared with that in the cooling step in the primary sintering time, and the cooling time lasts for 9.0 hours. The two-time-sintering process for increasing the initial permeability of the high-permeability ferrite has the advantages that the unqualified products with the inductance coefficient within 25% below the lowest standard value can be enabled to be qualified after two-time sintering.

Description

technical field [0001] The invention relates to the field of manganese-zinc soft magnetic ferrite, in particular to a two-time sintering process for improving the initial magnetic permeability of high magnetic permeability ferrite. Background technique [0002] High permeability ferrite products (above 5K) often have a lot of unqualified products whose inductance is lower than the requirement or the batch inductance value is lower than the requirement after one-time sintering. If the unqualified products are scrapped, the enterprise will cause Great economic loss, the new process technology of double sintering was not used before, and the loss exceeded millions of yuan every year. The primary sintering process is as follows: 1. Kiln installation; 2. Glue removal, 3. Heating, 4. High temperature insulation, according to different products, choose a certain temperature between 1380-1400 ° C for 5 hours; 5. Cooling, atmosphere protection cooling, cooling down The time is 9.0h....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/64H01F1/34
CPCC04B35/2658C04B35/64C04B2235/656C04B2235/6567H01F1/344
Inventor 徐仲达燕杰陈志华许锡坤毕建国
Owner ZHEJIANG CHUNHUI MAGNETOELECTRICITY TECH CO LTD