Ferrite addictive for preventing cracking during sintering

A ferrite and anti-sintering technology is applied in the field of ferrite anti-sintering cracking additives to achieve the effects of increasing the sintering speed, preventing cracking and accelerating the sintering speed

Inactive Publication Date: 2014-02-12
谢永球
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] When the ferrite magnetic material is sintered and the temperature is raised, the glue and water accumulate inside the blank when it vaporizes, causing the local pressure of the blank to be too high, and the high-pressure gas is not normally discharged in a concentrated manner , causing the blank to crack
[0003]The commonly used anti-sintering cracking methods mainly involve the control of the sintering process. Is there any effective additive that can prevent ferrite from cracking in the middle of the scale?

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] Below in conjunction with example the present invention is described in further detail. However, the invention is not limited to the examples given.

[0016] The ferrite anti-sintering cracking additive is a kind of particle with microporous structure inside, which is bonded together by ferrite powder through glue. In the granules, the ferrite powder has the same composition as that of the ferrite to be sintered, and is equipped with about 0.01%-0.1% glue, which is mixed with water and processed by drying. During the drying process, the water is vaporized, so that the particles have a microporous structure. At the same time, due to the bonding effect of the glue, the ferrite powder is bonded together and will not be easily scattered. Therefore, after molding, the specific gravity of this additive is very light.

[0017] In this example, the particle size of the particles ranges from 230 mesh to 20 mesh, and polyvinyl alcohol is used as the glue, and the grade of the po...

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PUM

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Abstract

The invention relates to a ferrite addictive for preventing cracking during sintering, and is characterized by being ferrite powder with an internal micropore structure. The ferrite addictive is added into a normal powder material according to a ratio of 5 to 20%, the mechanical strength of the additive is low, so the addictive is easy to crush and disperse into the blank to form a three-dimensional network distribution from outside to inside, namely a conductive three-dimensional network structure, thus a good channel for discharging water and glue is provided for the product, so the volatile substances are easy to discharge from the blank when the blank is heated, and cracking is difficult to form. The ferrite addictive can largely improve the blank sintering speed and greatly increase the output for factories which use the nitrogen kilns. By using the ferrite addictive, the cracking of a magnetic core feedback material during a multi-layer sintering process can be well avoided; the sintering speed can be accelerated in a factory that uses belly type furnaces, and a whole sintering process can be finished within a day; and cracking phenomenon is basically eliminated when manufacturing large-size magnetic cores.

Description

technical field [0001] The invention relates to a ferrite anti-sintering cracking additive. Background technique [0002] When the ferrite magnetic material is sintered and the temperature is raised, the glue and water are accumulated inside the blank when it is vaporized, resulting in an excessively high local pressure of the blank, and when the high-pressure gas is not normally discharged in a concentrated manner, the blank is cracked. [0003] The commonly used anti-sintering cracking methods mainly involve the control of the sintering process. Is there any effective additive that can prevent the ferrite from cracking. Contents of the invention [0004] The technical problem to be solved by the invention is to overcome the deficiencies of the prior art and provide a ferrite anti-sintering cracking additive. [0005] In order to solve the above technical problems, a ferrite anti-sintering cracking additive of the present invention is characterized in that it is a parti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/634C04B35/26
Inventor 谢永球
Owner 谢永球
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