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Preparation method of flat-shaped high-frequency wave-absorbing magnetic powder

A high-frequency wave-absorbing, flat-shaped technology, applied in the field of preparation of flat-shaped high-frequency wave-absorbing magnetic powder, can solve the problem of improving the performance of ferromagnetic metal powder and production efficiency, the number of debris in magnetic metal powder particles, and the flattening rate Low-level problems, to achieve the effect of improving the flattening efficiency, improving the performance of magnetic powder, and improving the flattening rate

Inactive Publication Date: 2020-08-04
苏州安洁新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The limitations of the ball milling method and the simplification of the ball milling medium lead to the preparation of magnetic metal powder particles with many debris and low flattening rate, and the ball milling efficiency is low and time-consuming, which seriously affects the performance improvement and production efficiency of ferromagnetic metal powder.

Method used

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  • Preparation method of flat-shaped high-frequency wave-absorbing magnetic powder
  • Preparation method of flat-shaped high-frequency wave-absorbing magnetic powder
  • Preparation method of flat-shaped high-frequency wave-absorbing magnetic powder

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Experimental program
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Effect test

Embodiment

[0030] A preparation method of flat high-frequency wave-absorbing magnetic powder, comprising the following steps:

[0031] Step 1: material selection,

[0032] Ferromagnetic metal powder includes carbonyl iron powder, iron-nickel powder, nickel powder and iron-silicon-chromium powder, the shape is not limited, preferably block and spherical, ball milling solvent, organic solvent is selected;

[0033] Step 2: Ball milling, using wear-resistant balls as the ball milling medium, mixing ferromagnetic metal powder with ball milling solvent, dispersant and other additives in a planetary ball mill, wherein the ball-to-material ratio is 10:1-20:1, and dispersing The amount of additives and other additives accounts for ≤1% of the mass percentage of the ferromagnetic metal powder, and then ball mills for 2 to 6 hours under the condition of the speed of the planetary ball mill ≧400r / min to initially flatten the ferromagnetic metal powder. Adjust it below 200r / min to reduce the impact f...

Embodiment 1

[0040] A preparation method of flat high-frequency wave-absorbing magnetic powder, comprising the following steps:

[0041] First, select spherical carbonyl iron powder as the raw material for ball milling, with a particle size of 5-30 μm, select steel balls as the ball milling medium with a diameter of 6.8 mm, isopropanol as the ball milling solvent, and silane oligomer as the dispersant, among which, the mass is 1% of the mass of spherical carbonyl iron powder;

[0042] One-time ball milling: put spherical carbonyl iron powder, ball milling solvent, steel ball and dispersant into a planetary ball mill for one ball milling, the mass ratio of spherical carbonyl iron powder, isopropanol and steel ball is 1:4:10, planetary ball mill The speed is 500r / min, and the ball mill is 2h;

[0043]Secondary ball milling: adjust the rotation speed of the planetary ball mill to 150r / min, and the ball milling time is 4h, put the spherical carbonyl iron powder into an oven for drying treatme...

Embodiment 2

[0053] A preparation method of flat high-frequency wave-absorbing magnetic powder, comprising the following steps:

[0054] First, block iron-nickel powder is selected as the raw material for ball milling, with a particle size of 10-50 μm, steel balls are used as the ball milling medium, the diameter of the steel ball is 6.8 mm, hexane is used as the ball milling solvent, and poly-N-vinylacetamide is used as the dispersant. The mass is 0.5% of the magnetic powder mass and the silane coupling agent KH580 is other additives, and its mass is 0.3% of the magnetic powder mass;

[0055] One-time ball milling: put magnetic powder, ball milling solvent, steel ball, dispersant and other additives into a planetary ball mill for one ball milling, the mass ratio of magnetic powder, hexane and steel ball is 1:4:10, and the speed of the sand mill is 600r / min, ball milling for 3h;

[0056] Secondary ball milling: adjust the rotation speed of the planetary ball mill to 100r / min, and the ball...

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Abstract

The invention relates to a preparation method of flat-shaped high-frequency wave-absorbing magnetic powder. The preparation method comprises the following steps of, step 1, selecting materials, specifically, ferromagnetic metal powder and ball milling solvent, and selecting organic solvent; and step 2, ball milling, specifically, selecting a wear-resistant ball as a ball milling medium, mixing theferromagnetic metal powder with the ball milling solvent, a dispersing agent and other auxiliaries in a planetary ball mill, wherein the ball material ratio is 10:1-20:1, the mass percent of dosage of the dispersing agent and other auxiliaries of the ferromagnetic metal powder is less than or equal to 1%, and then carrying out ball milling for 2-6 h under the condition that the rotating speed ofthe planetary ball mill is greater than or equal to 400 r / min, carrying out preliminary flattening of the ferromagnetic metal powder, adjusting the rotating speed of the planetary ball mill to less than 200 r / min, reducing the impact force of the ball milling medium on the flat powder, reducing the breaking rate of the ferromagnetic metal powder, continuing the ball milling for 1-8 h, and carryingout discharging and drying so as to perform annealing treatment at 500-800 DEG C under the protection of reducing atmosphere of argon, hydrogen and nitrogen for eliminating stress. According to the preparation method, the flattening rate can be improved, the flattening time can be saved, and the performance of the magnetic powder can be improved.

Description

technical field [0001] The invention belongs to the field of wave-absorbing materials, in particular to a preparation method of flat high-frequency wave-absorbing magnetic powder. Background technique [0002] With the rapid development of electronic technology, electronic products are rapidly developing towards diversified directions such as energy saving, intelligence, informationization, multi-system, multi-function and entertainment. The popularization of these electronic products with various personalized entertainment functions has greatly enriched people's material life needs, but at the same time, it has inevitably brought some problems, especially the electromagnetic compatibility (EMC) problem. The existence of electromagnetic compatibility problems often makes electronic and electrical equipment or systems unable to work normally, performance is reduced, and even damaged. [0003] In addition, with the rapid development of 5G technology and the integration of mor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/04B22F3/24
CPCB22F9/04B22F3/24B22F2009/043B22F2009/042B22F2003/248B22F1/068
Inventor 郝斌吴志刚季文彬夏晓亮郑国星
Owner 苏州安洁新材料有限公司
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