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A kind of electromagnetic wave absorber with large aspect ratio and preparation method thereof

A large aspect ratio, electromagnetic wave technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of insufficient particle size distribution, small aspect ratio, long working hours, etc. The effect of uniform diameter distribution and low process energy consumption

Active Publication Date: 2017-04-26
GUANGZHOU GOLDEN SOUTH MAGNETIC MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current preparation method consumes a lot of energy and takes a long time. The edge shape of the powder of the electromagnetic wave absorber is irregular, the particle size distribution is not concentrated enough, the aspect ratio is small, and the electromagnetic wave absorption performance is not good.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Step 1, the D 50 The nitrogen atomized spherical alloy powder of 10-20 μm and the solvent form a mixture with a mass ratio of 20:80, add a grinding aid containing 2wt‰ alloy powder, and put it into a high-speed ball mill for flattening treatment. After 10 hours After treatment, release material A to obtain filter cake B through pressure filtration;

[0022] Step 2, adding the filter cake B and the dispersant to the powder shaping equipment at a mass ratio of 99:1 for shaping treatment for 8 hours, and then releasing the material and drying to obtain a powder C;

[0023] Step 3, powder C is processed in a heat treatment furnace to obtain powder D;

[0024] Step 4, the powder D is classified by air flow to select D 50 It is 60-80μm powder, which is the electromagnetic wave absorber.

[0025] The solvent is selected from high-boiling linear alkanes, preferably C 7 -C 9 Linear alkanes, more preferably D 80 Solvent oil. The dispersant is selected from C 16 -C 19 uns...

Embodiment 2

[0028] Step 1, the D 50 The nitrogen atomized spherical alloy powder of 10-20 μm and the solvent form a mixture at a mass ratio of 30:70, add a grinding aid containing 8wt‰ alloy powder, and put it into a high-speed ball mill for flattening treatment. After 20 hours After treatment, release material A to obtain filter cake B through pressure filtration;

[0029] Step 2, adding the filter cake B and the dispersant to the powder shaping equipment at a mass ratio of 98:2 for shaping treatment for 2 hours, and then releasing the material and drying to obtain powder C;

[0030] Step 3, powder C is processed in a heat treatment furnace to obtain powder D;

[0031] Step 4, the powder D is classified by air flow to select D 50 It is 60-80μm powder, which is the electromagnetic wave absorber.

[0032] The solvent is selected from high-boiling linear alkanes, preferably C 7 -C 9 Linear alkanes, more preferably D 80 Solvent oil. The dispersant is selected from C 16 -C 19 unsatur...

Embodiment 3

[0035] Step 1, the D 50 The nitrogen atomized spherical alloy powder of 10-20 μm and the solvent form a mixture at a mass ratio of 25:75, add a grinding aid containing 4wt‰ alloy powder, and put it into a high-speed ball mill for flattening treatment. After 14 hours After treatment, release material A to obtain filter cake B through pressure filtration;

[0036] Step 2, adding the filter cake B and the dispersant to the powder shaping equipment at a mass ratio of 98:1 for shaping treatment for 6 hours, and then releasing the material and drying to obtain powder C;

[0037] Step 3, powder C is processed in a heat treatment furnace to obtain powder D;

[0038] Step 4, the powder D is classified by air flow to select D 50 It is 60-80μm powder, which is the electromagnetic wave absorber.

[0039] The solvent is selected from high-boiling linear alkanes, preferably C 7 -C 9 Linear alkanes, more preferably D 80 Solvent oil. The dispersant is selected from C 16 -C 19 unsatur...

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PUM

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Abstract

The invention provides a preparation method of an electromagnetic wave absorber with the large length-diameter ratio. The method comprises combined processes of flattening treatment, filter pressing, shaping, heat treatment and stage treatment of nitrogen-atomized spherical alloy powder. The energy consumption is low, the working time is short, and the prepared electromagnetic wave absorber powder is uniform in particle size distribution, small in particle size distribution span, regular in shape, smooth and clean in surface, large in length-diameter ratio and good in electromagnetic wave absorbability.

Description

technical field [0001] The invention belongs to the technical field of fine inorganic chemicals, and in particular relates to a method for preparing an electromagnetic wave absorber with a large aspect ratio, and the electromagnetic wave absorber prepared by the method. Background technique [0002] With the development of modern science and technology, the application of electronic and information technology has developed rapidly, and various modern electronic devices such as mobile phones have become popular rapidly, and people are using and relying on more and more information systems. The radiation and leaked electromagnetic waves of electronic equipment threaten human health and safety; information systems are transmitted by means of digital signals, which are easily interfered by electromagnetic waves and cause errors. It has been found that the electromagnetic wave interference generated by the radiated electromagnetic waves of electronic and information equipment can...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/00
Inventor 刘忠庆安爱民汪小明
Owner GUANGZHOU GOLDEN SOUTH MAGNETIC MATERIAL