Mn-Zn ferrite

A ferrite, manganese-zinc technology, applied in the direction of inorganic material magnetism, etc., can solve the problem of not being able to obtain high magnetic permeability characteristics at the same time

Inactive Publication Date: 2003-03-05
无锡晶石磁性电子器件有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is impossible to obtain high magnetic permeability characteristics required for high-speed communication and wide-bandwidth at the same time.

Method used

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  • Mn-Zn ferrite
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Will Fe 2 o 3 (53.5 mole %), MnO (26 mole %) and ZnO (20.5 mole %) as main components, add dispersant simultaneously: polypropionic acid: 0.5 weight %, defoamer: n-octanol: 0.2 weight %, deionized water 95% by weight. After mixing them, add binder: polyvinyl alcohol: 0.8% by weight solution, mix in a high-speed mixer for 70-80 minutes, and make an average particle size of 100 microns by spray drying machine, moisture below 0.1%, and flow Particles with an angle of less than 40 degrees; pre-fired in a rotary kiln, pre-fired temperature: 800-980 ° C, pre-fired time: 5 minutes to 2 hours; 3. Dry or wet crushing for 25-35 minutes, Made into an average particle size of 1.5-2.0 microns; adding additive ingredients: calcium oxide (CaO): 0.02% by weight, silicon dioxide (SiO 2 ): 0.01% by weight, niobium oxide (Nb 2 o 5 ): 0.03% by weight, tantalum oxide (Ta 2 o 5 ): 0.03% by weight, zirconia (ZrO 2 ): 0.04% by weight, hafnium oxide (HfO 2 ): 0.04% by weight, the above...

Embodiment 2

[0041] In the composition of manganese-zinc ferrite, Fe 2 o 3 (50 mol%), MnO (22 mol%), ZnO (16 mol%) as the main components, and the relative main components as additive components except CaO and SiO 2 , also contains Bi 2 o 3 、MoO 3 and P adopt the preparation method in Example 1 to obtain samples 11-16; containing Bi 2 o 3 and P give samples 17 and 18, and only P gives sample 19. As a comparative sample 20-22 is made Bi 2 o 3 、MoO 3 And the addition of P is prepared outside the above range.

[0042] Each obtained sample was evaluated similarly to Example 1. The results are listed in Table 2

[0043] Sample 12

[0044] *) means outside the range and preferred range of the present invention.

Embodiment 3

[0046] In the composition of manganese-zinc ferrite, Fe 2 o 3 (55 mol%), MnO (25 mol%), and ZnO (18 mol%) are the main components, and the main components are additive components except CaO and SiO 2 , also contains In 2 o 3 、MoO 3 and P adopt the method that embodiment 1 makes to make sample 23-28; Contain In 2 o 3 and P gave samples 29 and 30, and only P gave sample 31. As comparative samples 32-34 are made In 2 o 3 、MoO 3 And the addition of P is prepared outside the above range.

[0047] Each obtained sample was evaluated similarly to Example 1. The results are listed in Table 3

[0048] table 3

[0049] *) means outside the range and preferred range of the present invention.

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Abstract

The present invention relates to a kind of Mn-Zn ferrite, belonging to the field of oxide magnetic material technology, its main components are: Fe2O3 49-58 mole%, MnO 21-31 mole % and ZnO 15-26 mole%, and the additive component is added, they can be made into ring magnetic core whose mean grain size is 20-80 micrometer, outer diameter is 25 millimeter, inner diameter is 15 millimeter and height is 5 millimeter. In the frequency range of 1K-150 KHz its magnetic conductivity can be up to high level more than 12000, when it is used for making transformer, the number of turns can be reduced, said transformer can be miniaturized, specially, the transformer with high-frequency characteristics can be obtained in the digital transmission system of ISDN and ADSL, etc. and low volume distribution can be implemented, and the signal can be accurately transmitted.

Description

Technical field: [0001] The invention relates to a manganese-zinc series ferrite, which belongs to the technical field of oxide magnetic materials. technical background: [0002] Before the present invention was made, patent application number: 98800266.3 provided manganese oxide, zinc oxide and iron oxide containing main components, additive components: silicon dioxide of 50-150ppm, calcium oxide of 50-500ppm, bismuth oxide of 50-400ppm, In the sintered oxide magnetic material of 50-400ppm molybdenum oxide, the initial magnetic permeability at 10kHz is 8500 or more in the range of -20-20°C, and 10000 or more in the range of 20-100°C, A sintered body oxide magnetic material of the above materials at 1300-1400° C., and an oxide magnetic material excellent in temperature characteristics having initial magnetic permeability by adding bismuth oxide and molybdenum oxide. Although the magnetic material described in this gazette is suitable for the pulse transformer of the S / T con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622H01F1/10H01F1/34
Inventor 董斌黄国祥
Owner 无锡晶石磁性电子器件有限公司
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