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Manganese-zinc ferrite magnetic core mfg. method

A technology of manganese-zinc ferrite and its manufacturing method, which is applied in the manufacture of inductors/transformers/magnets, magnetic materials of inorganic materials, electrical components, etc., can solve the problems of long manufacturing cycle, large consumption of heating elements and refractory materials, etc. Effects of low cost, high saturation flux density, and low core loss

Inactive Publication Date: 2003-03-12
无锡晶石磁性电子器件有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, it will inevitably lead to a long manufacturing cycle, a large consumption of heating elements and refractory materials, etc.

Method used

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  • Manganese-zinc ferrite magnetic core mfg. method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Fe with high silicon content 2 o 3 (53.3 mol%), ZnO (10 mol%) and MnO (36.7 mol%) were compounded as main components. At the same time, add dispersant: 0.5% by weight of polypropionic acid, defoamer: 0.2% by weight of n-octanol, 95% by weight of deionized water, binder: 0.45% by weight of polyvinyl alcohol solution, in a high-speed mixer Mixed for 75 minutes, the viscosity is 250-350cps. Through the spray drying mechanism, the average particle size is about 100 microns, the moisture content is less than 0.1% by weight, and the flow angle is less than 40 degrees; it is pre-fired in a rotary kiln at a temperature of 900 ° C for a certain period of time ;Perform dry or wet crushing for 25-35 minutes to make a powder with an average particle size of 1.5-2.0 microns; relative to the above powder, add: additive: calcium oxide (CaO): 0.01-0.05% by weight; Deionized water is 70% by weight; dispersant: polypropionic acid is 0.4% by weight; defoamer: n-octanol is 0.2% by weigh...

Embodiment 2

[0047] In the composition of the manganese-zinc-based ferrite in Example 1, Nb may be contained in addition to CaO as the main component as an additive component. 2 o 5 , V 2 o 5 and TiO 2 Samples 9-20 were obtained by using the method prepared in Example 1. Each obtained sample was evaluated similarly to Example 1. The results are listed in Table 2

[0048] Table 2

Embodiment 3

[0050] Fe with high silicon content 2 o 3 (52.6 mol%), ZnO (12 mol%) and MnO (35.4 mol%) were compounded as main components. At the same time, add dispersant: 0.4% by weight of polypropionic acid, defoamer: 0.3% by weight of n-octanol, 95% by weight of deionized water, binder: 0.3% by weight of polyvinyl alcohol solution, in a high-speed mixer Mix for 70 minutes to make a slurry with a viscosity of 250-350CPS. Through the spray drying mechanism, the average particle size is about 100 microns, the moisture content is less than 0.1% by weight, and the flow angle is less than 40 degrees; put it in the rotary kiln for pre-calcination, the pre-calcination temperature is 860 ° C, and the pre-fires for a certain period of time; Carry out dry or wet pulverization for 25-35 minutes to make a powder with an average particle size of 1.5-2.0 microns; relative to the above powder, add: additive calcium oxide (CaO): 0.01-0.15% by weight; deionized Water is 70% by weight; dispersant: poly...

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Abstract

A MnZn ferrite core is prepared from high-Si iron oxide (52.6-54 mol%), zinc oxide (8-12 mol%), manganese oxide (35.4-38 mol%) and calcium oxide (0.02-0.12 wt.%) through sintering in the oxygen partial pressure controlled nitrogen gas or vacuum atmosphere. Its advantages are low cost, low magnetic loss, high saturated magnetic flux density, and short sinter time (20 hr).

Description

Technical field: [0001] The invention relates to a manufacturing method of a manganese-zinc ferrite core, which belongs to the field of oxide magnetic material manufacturing. Background technique: [0002] Ferrite cores used in flyback transformers, especially power supply transformers, are increasingly required to have low core loss and high saturation flux density to meet the miniaturization and high efficiency requirements of current electrical equipment. Before the present invention was made, in the prior art, the manganese-zinc ferrite cores that were used to manufacture flyback transformers, power transformers and coils on the market were all made of high-purity, silicon-removed iron oxide no matter at home or abroad, and The sintering time is long, resulting in high manufacturing costs. For example, application number 00126316.1 describes that iron oxide, zinc oxide, and manganese oxide are contained in its main components. Add silicon oxide (SiO 2 ) 60-140ppm, cal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/22H01F41/02
Inventor 董斌黄国祥黄舰
Owner 无锡晶石磁性电子器件有限公司
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