High flux ferrite powder capable of reducing cracking

A ferrite powder, high magnetic flux technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problems of improving the quality cost of ferrite materials, increasing production costs, high sintering temperature, and reducing internal stress. , The effect of reducing cracking and improving magnetic permeability

Active Publication Date: 2019-04-23
山东春光磁电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, ferrite materials are widely produced mainly as a kind of ceramic device, but since device manufacturers mostly use dry pressing, a part of air will be retained inside the blank during the pressing process, and the air, glue in the powder, and Concentrated volatilization of moisture, etc. can easily cause the blank to crack, and this quality problem will generally cause a defective rate of 2-10% or even higher in batch production
In the process of producing high magnetic flux ferrite, due to the higher sintering temperature and longer sintering time required, it is more likely to cause cracking of the blank
The existence of this kind of defect greatly increases the quality cost of ferrite materials, and the main method to prevent cracking at present is to reduce the heating rate of the blank during the sintering process, but this method increases the production cost and causes other quality problems at the same time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A high magnetic flux ferrite powder capable of reducing cracking. The raw materials include the following components by molar ratio: 51.5 parts of ferric oxide, 22.5 parts of zinc oxide, and 26.0 parts of manganese oxide; and adding the above solid weight ratio of 8.5% of mixed glue, and 3% inert nanocomposite paste.

[0017] A method for preparing a high magnetic flux ferrite powder capable of reducing cracking, comprising the following steps:

[0018] 1) Ingredients: 51.5 parts of ferric oxide, 22.5 parts of zinc oxide, and 26.0 parts of manganese oxide are put into a solid mixer and fully mixed;

[0019] 2) Pre-burning: Pre-fire the mixture in 1) into 2-12mm balls through a rotary kiln at a temperature of 950 degrees;

[0020] 3) Sand milling: transfer the pre-fired balls into the slurry tank after vibration grinding, and add phosphorus pentoxide, molybdenum trioxide, cobalt trioxide, calcium carbonate, silicon oxide additives, and the addition amount is 50 -500ppm...

Embodiment 2

[0025] A high magnetic flux ferrite powder capable of reducing cracking. The raw materials include the following components in molar ratio: 52.5 parts of ferric oxide, 22.5 parts of zinc oxide, and 25 parts of manganese oxide, and 10% by weight of the above-mentioned solids are added. of mixed glue, and 3% inert nanocomposite paste.

[0026] A method for preparing a high magnetic flux ferrite powder capable of reducing cracking, comprising the following steps:

[0027] 1) Mixture preparation: 52.5 parts of ferric oxide, 22.5 parts of zinc oxide, and 25 parts of manganese oxide are put into a solid mixer and fully mixed;

[0028] 2) Pre-burning: Pre-fire the mixture in 1) into 2-10mm balls through a rotary kiln at a temperature of 900 degrees;

[0029] 3) Sand milling: transfer the pre-fired balls into the slurry tank after vibration grinding, and add phosphorus pentoxide, molybdenum trioxide, cobalt trioxide, calcium carbonate, silicon oxide additives, and the addition amount...

Embodiment 3

[0034] A high magnetic flux ferrite powder capable of reducing cracking, its raw materials include the following components in molar ratio: 53.2 parts of ferric oxide, 24.2 parts of zinc oxide, 22.6 parts of manganese oxide, and add the above solid weight ratio of 10% of mixed glue, and 3% inert nanocomposite paste.

[0035] A method for preparing a high magnetic flux ferrite powder capable of reducing cracking, comprising the following steps:

[0036] 1) Mixture preparation: put 53.2 parts of ferric oxide, 24.2 parts of zinc oxide, and 22.6 parts of manganese oxide into a solid mixer for thorough mixing;

[0037] 2) Pre-burning: Pre-burning the mixture in 1) into 2-10mm balls through a rotary kiln at a temperature of 930 degrees;

[0038] 3) Sand milling: transfer the pre-fired balls into the slurry tank after vibration grinding, and add phosphorus pentoxide, molybdenum trioxide, cobalt trioxide, calcium carbonate, silicon oxide additives, and the addition amount is 50 -500pp...

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Abstract

The invention discloses high flux ferrite powder capable of reducing cracking. The raw materials of the high flux ferrite powder capable of reducing the cracking comprise the following components in parts by mole: 51.0 to 55.0 parts of iron sesquioxide, 21.0 to 25.0 parts of zinc oxide, and 20.0 to 28.0 parts of manganese oxide; glue with 0.7 to 1.5 weight parts of solid is added and a certain weight of an inert nano-composite material. Polyvinyl acetate with the glass transition temperature of less than 40 DEG C is added so that the one-dimensional compressibility of the powder is greatly improved; the inert nano-composite particles which are prepared by the main components of nano-amorphous iron oxide (or hydroxyl ferric oxide) and manganous-manganic oxide are adopted, so that the a gluedischarging channel can be provided in an early stage, and the inert nano-composite particles can be molten in original crystal particles without affecting the main component of the ferrite in a lateperiod; and the wear of slurry and a spraying piece of a spraying gun of a spraying tower can be reduced by performing spray-granulating by adopting the ferrite slurry which is coated by the inert nano-material which is coated by adopting a resistance reducing agent, namely a hydroxyethyl cellulose solution, so that the cost is reduced, and meanwhile, the size consistency of the particles is improved.

Description

technical field [0001] The invention relates to the technical field of ferrite powder, in particular to a high magnetic flux ferrite powder capable of reducing cracking. Background technique [0002] As an essential part of electronic devices, ferrite materials have been widely used in communication, electronics, aerospace and other fields. At present, ferrite materials are widely produced mainly as a kind of ceramic device, but since device manufacturers mostly use dry pressing, a part of air will be retained inside the blank during the pressing process, and the air, glue in the powder, and Concentrated volatilization of moisture, etc. can easily cause the blank to crack, and this quality problem generally results in a 2-10% defect rate or even higher in batch production. In the process of producing high magnetic flux ferrite, due to the higher sintering temperature and longer sintering time, it is more likely to cause cracking of the blank. The existence of this kind of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622H01F1/34
CPCC04B35/2658C04B35/622C04B2235/3208C04B2235/3256C04B2235/3275C04B2235/34C04B2235/3418C04B2235/95H01F1/344
Inventor 宋兴连刘涛韩卫东解丽丽
Owner 山东春光磁电科技有限公司
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