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Wide-band manganese-zinc series high-magnetic-conductivity soft magnet oxysome material

A technology of soft magnetic ferrite and high magnetic permeability, applied in the direction of magnetic properties of inorganic materials, can solve problems that have not been solved, and achieve the effect of high cut-off frequency, high initial magnetic permeability, and easy mass production

Active Publication Date: 2005-10-05
广东肇庆微硕电子有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the problem of how to increase the initial high permeability and cut-off frequency at the same time has not been resolved.

Method used

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  • Wide-band manganese-zinc series high-magnetic-conductivity soft magnet oxysome material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Formula: Weight Ratio Molar Ratio

[0022] Fe 2 o 3 : 69.85% 53mol%

[0023] mn 3 o 4 : 15.39% 24mol% (calculated by moles of MnO)

[0024] ZnO: 14.76% 23mol%

[0025] TiO 2 : 0.015% (primary additive)

[0026] SnO 2 : 0.015% (primary additive)

[0027] Li 2 CO 3 : 0.025%

[0028] CoO: 0.05%

[0029] Process steps: first add the additive TiO 2 , SnO 2 with the main component Fe 2 o 3, Mn 3 o 4 Mix with ZnO in a wet method, conduct the first ball milling, the time is about 3 hours, and pre-fire at 880°C±10°C; then add the additive Li to the above-mentioned pre-fired material 2 CO 3 And CoO, the second ball milling time is about 6 hours; after spray granulation, press the ring of T25×15×7.5, sinter at a temperature of 1300 ℃, and keep it for 5 hours.

Embodiment 2

[0031] Formula: Weight Ratio Molar Ratio

[0032] Fe 2 o 3 : 67.7% 51mol%

[0033] mn 3 o 4 : 17.43% 27mol% (calculated by moles of MnO)

[0034] ZnO: 14.87% 22mol%

[0035] CaCO 3 : 0.03% (primary additive)

[0036] MgO: 0.015% (primary additive)

[0037] Bi 2 o 3 : 0.02%

[0038] CoO: 0.05%

[0039] Process steps: first add the additive CaCO 3 , MgO and the main component Fe 2 o 3 , Mn 3 o 4 Wet mixed with ZnO, ball milled for the first time for about 3 hours, and pre-fired at 920°C±10°C; then added the additive Bi to the above-mentioned pre-fired material 2 o 3 And CoO, the second ball milling time is about 5.5 hours; after spray granulation, press the ring of T25×15×7.5, sinter at a temperature of 1320 ° C, and keep it for 5 hours.

Embodiment 3

[0041] Formula: Weight Ratio Molar Ratio

[0042] Fe 2 o 3 : 70.24% 54mol%

[0043] mn 3 o 4 : 15.19% 24mol% (calculated by moles of MnO)

[0044] ZnO: 14.57% 22mol%

[0045] CaCO 3 : 0.03% (primary additive)

[0046] CuO: 0.02% (primary additive)

[0047] Nb 2 o 5 : 0.02%

[0048] CoO: 0.01%

[0049] Mo 2 o 3 : 0.04%

[0050] V 2 o 5 : 0.015%

[0051] Process steps: first add the additive CaCO 3 , CuO and the main component Fe 2 o 3 , Mn 3 o 4 Wet mixed with ZnO, ball milled for the first time for about 5 hours, and pre-fired at 890°C±10°C; then add additive Nb to the above-mentioned pre-fired material 2 o 5 Bi 2 o 3 , CoO, Mo 2 o 3 and V 2 o 5 , the second ball milling time is about 6 hours; after spray granulation, press the ring of T25×15×7.5, sinter at a temperature of 1320° C., and keep it warm for 5 hours.

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Abstract

The material of soft-magnetic ferrite comprises 50 - 55mol% Fe, 20 - 30mol% MnO, and 20 - 30mol% ZnO. initial permeability Mui is greater than or equal to 10000, and cut-off frequency fr is greater than or equal to 400 kHz. Features are low cost and applicable to fabricating filters, inductance transformer, digital transformer, chokes and current transformers etc.

Description

technical field [0001] The present invention relates to a kind of Mn-Zn system high magnetic permeability soft magnetic ferrite material, more specifically, the present invention relates to a kind of high magnetic permeability Mn-Zn with initial magnetic permeability μi≥10000 and cut-off frequency fr≥400KHz It is a soft ferrite material. Background technique [0002] In modern technology, soft ferrite has been widely used in various aspects of production and life. However, with the development of SMT technology, the circuit and the whole machine are developing in the direction of light weight, miniaturization and planarization. In order to reduce the size of the magnetic core, the initial permeability of Mn-Zn high-permeability soft ferrite is required to be higher and higher; at the same time, in order to be suitable for higher frequency working environments and greater power, Mn-Zn is required The frequency of the initial permeability of the high permeability soft ferrit...

Claims

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Application Information

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IPC IPC(8): H01F1/34
Inventor 葛培盛王京平周芸张宾曾伟鑫刘会冲周丽云罗丹庞贤光
Owner 广东肇庆微硕电子有限公司
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