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Super high magnetic conductivity, high courier temperature Mn-Zn ferrite and its preparation method

A ferrite, ultra-high magnetic technology, applied in the manufacture of inductors/transformers/magnets, inorganic material magnetism, electrical components, etc., can solve the problems of initial permeability, low Curie temperature, etc. The effect of reducing loss and simple process

Active Publication Date: 2008-01-16
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a Mn-Zn ferrite with ultra-high magnetic permeability and high Curie temperature and a preparation method thereof for the defects of the prior art with low initial magnetic permeability and low Curie temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Will Fe 2 o 3 (53.5 mol %), ZnO (21 mol %) and MnO (25.5 mol %) carry out batching as main components, strong mixing 30 minutes, vibration 30 minutes, the mixture that obtains is put into rotary kiln at 800 ℃ and pre-fires 3 hours. Add auxiliary components to the obtained calcined body as shown in Tables 1-3: add dispersant polycaprolactone relative to the weight percentage of the ferrite component: 0.3-0.6wt%, deionized water 80-180wt%, binder PVA: 0.8-1.2wt%, defoamer n-octanol: 0.1-0.4wt%, steel balls 400-750wt%; sanding in a sand mill for 70 minutes, the particle size of the slurry is controlled at 0.8-1.2 microns , and then, adding PVA to it and granulating by spray drying to form particles with an average particle size of 80-200 μm; using an automatic molding machine to form a blank with an outer diameter of 25mm, an inner diameter of 15mm, and a height of 6mm under a pressure of 7-11Mpa -8.5mm sample ring; through heating, heat preservation at 1350°C for 8 hour...

Embodiment 2

[0059] Will Fe 2 o 3 (51 mol %), ZnO (23 mol %) and MnO (26 mol %) are carried out batching as main components, strong mixing 30 minutes, vibrate 30 minutes, the mixture that obtains is put into rotary kiln at 850 ℃ and calcined 2 hours. Add auxiliary components to the obtained calcined body as shown in Table 4: add dispersant polycaprolactone relative to the weight percentage of the ferrite component: 0.3-0.6wt%, deionized water 80-180wt%, binder PVA: 0.8-1.2wt%, defoamer n-octanol: 0.1-0.4wt%, steel balls 400-750wt%; sand mill for 70 minutes in a sand mill, the particle size of the slurry is controlled at 0.8-1.2 microns, and then PVA is added to it and granulated by spray drying to form particles with an average particle size of 80-200μm; an automatic molding machine is used to form a blank with an outer diameter of 25mm, an inner diameter of 15mm, and a height of 6-8.5mm under a pressure of 7-11Mpa. Sample rings: heating, holding at 1400°C for 5 hours, strictly controlli...

Embodiment 3

[0089] Will Fe 2 o 3 (53 mole %), ZnO (27 mole %) and MnO (20 mole %) are carried out batching as main components, strong mixing 30 minutes, vibration 30 minutes, the mixture that obtains is put into rotary kiln at 900 ℃ and calcined 1 hour. Add auxiliary components to the obtained calcined body as shown in Table 6: add dispersant polycaprolactone relative to the weight percentage of ferrite components: 0.3-0.6wt%, deionized water 80-180wt%, binder PVA: 0.8-1.2wt%, defoamer n-octanol: 0.1-0.4wt%, steel balls 400-750wt%; sand mill for 70 minutes in a sand mill, the particle size of the slurry is controlled at 0.8-1.2 microns, and then PVA is added to it and granulated by spray drying to form particles with an average particle size of 80-200μm; an automatic molding machine is used to form a blank with an outer diameter of 25mm, an inner diameter of 15mm, and a height of 6-8.5mm under a pressure of 7-11Mpa. Sample rings: heating, holding at 1450°C for 3 hours, strictly controll...

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Abstract

The invention provides a Mn-Zn ferrite with high magnetic conductivity and high magnetic inversion temperature; major components of the ferrite include manganese oxide, zinc oxide, and iron oxide, and auxiliary components include bismuth oxide, molybdenum oxide, and niobium oxide; wherein, the constituents of the major components are: manganese oxide calculated by 23-27 Moore (percent) of Mno, zinc oxide calculated by 20-26 Moore (percent) of ZnO; the rest is iron oxide; constituents of the auxiliary components are: bismuth oxide calculated by 0-0.08 weight (percent) (excluding zero) of Bi2O, molybdenum oxide calculated by 0-0.12 weight (percent) (excluding zero) of MoO3, and niobium oxide calculated by 0.01-0.1 weight (percent) (excluding zero) of Nb2O5; the crystal particle of Mn-Zn ferrite is 50-180micron; under the condition of 25 DEG C, 10KHz, and 0.25mT, the initial magnetic conductivity of the Mn-Zn ferrite is 15000-18000; under the condition of 100KHz and 0.25mT, the initial magnetic conductivity is 13000-15000, and the magnetic inversion temperature is above or equal to 130 DEG C; in addition, the method provides the production method for the Mn-Zn ferrite.

Description

technical field [0001] The invention relates to a manganese-zinc ferrite and a preparation method thereof, in particular to a Mn-Zn ferrite with high magnetic permeability and high Curie temperature and a preparation method thereof; it belongs to the technical field of oxide magnetic materials. Background technique [0002] With the rapid development of electronic information industries such as communications, computers, and networks, as well as the development trend of miniaturization and light weight of electronic components, high-permeability manganese-zinc ferrite can be widely used in transformer cores, noise filters, and local area network isolation. Transformer and digital network transformer core, because it can significantly reduce the size of the transformer and reduce the loss, so its research has attracted much attention at home and abroad. In practical applications, the Mn-Zn ferrite not only needs high magnetic permeability, but also requires good frequency cha...

Claims

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Application Information

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IPC IPC(8): H01F1/34H01F41/02
Inventor 汪作国颜冲包大新何时金
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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