Electromagnetic wave absorption particle with kieselguhr as template and preparation method thereof

A diatomite, electromagnetic wave technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problem of heavy metal powder specific gravity, and achieve the effects of reducing specific gravity, convenient material acquisition, and simple preparation method

Inactive Publication Date: 2012-07-04
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Metal powder materials have good electromagnetic and mechanical properties and are widely used. However, due to the large specific gravity of metal powder, it is subject to many restrictions in application. Therefore, the preparation of new lightweight metal composite materials has always been a research hotspot at home and abroad.

Method used

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  • Electromagnetic wave absorption particle with kieselguhr as template and preparation method thereof
  • Electromagnetic wave absorption particle with kieselguhr as template and preparation method thereof
  • Electromagnetic wave absorption particle with kieselguhr as template and preparation method thereof

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preparation example Construction

[0089] In the preparation process of step 4, the electroplating device is shown in Figure 4. In the figure, the anode and the cathode are connected to the positive and negative electrodes of the DC power supply respectively, and the cathode adopts a copper plate. In order to increase the particle density near the cathode, a perforated diaphragm is used to The electroplating tank is divided into a cathode chamber and an anode chamber, and a stirrer is arranged in the cathode chamber, and the aperture of the diaphragm with holes is 1 micron. The anode material is selected from copper, iron, nickel, cobalt, zinc and other metal single sheets (thickness 2 mm); or an alloy sheet of copper, iron, nickel, cobalt, zinc; or a graphite plate.

[0090] Step 5: Drying to obtain electromagnetic wave absorbing particles

[0091] Dry the metal-coated diatomite prepared in step 4 at a vacuum degree of -0.05MPa to -0.1MPa and 110 to 150°C for 2h to 4h to prepare electromagnetic wave absorbing ...

Embodiment 1

[0092] Example 1 : Preparation of iron metal particles using disc-shaped diatomaceous earth as a template.

[0093] Step 1: Pretreatment of diatomaceous earth

[0094] After grinding the diatomite to a particle size of 100 μm, the diatomite with organic matter removed is obtained after high-temperature treatment at 400°C for 50 minutes;

[0095] Put the diatomite and absolute ethanol solution (mass concentration of 95%) for removing organic matter into a glass container, and place the glass container in an ultrasonic cleaning machine, and ultrasonically clean it for 30 minutes under the conditions of power 800W and working frequency 28KHz , using filter paper with a pore size of 3 μm for separation, and filtering to obtain the supernatant of the filter paper; drying the supernatant at 110° C. for 6 hours to obtain dry diatomite;

[0096] The dosage of diatomite for removing organic matter and absolute ethanol solution is: add 3 g of diatomite for removing organic matter to ...

Embodiment 2

[0124] Example 2 : Preparation of nickel-iron metal particles with disc-shaped diatomite as template.

[0125] Step 1: Pretreatment of diatomaceous earth

[0126] After grinding the diatomite into a particle size of 50 μm, the diatomite with organic matter removed is obtained after high-temperature treatment at 400°C for 90 minutes;

[0127] Put the diatomite and absolute ethanol solution (mass concentration: 95%) to remove the organic matter into the glass container, and place the glass container in the ultrasonic cleaning machine, after ultrasonic cleaning for 40min under the conditions of power 800W and working frequency 28KHz , using filter paper with a pore size of 3 μm for separation, and filtering to obtain the supernatant of the filter paper; drying the supernatant at 120° C. for 6 hours to obtain dry diatomite;

[0128] The amount of diatomite and absolute ethanol solution for removing organic matter is: add 2 g of diatomite for removing organic matter to 100 ml of...

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Abstract

The invention discloses an electromagnetic wave absorption particle material with kieselguhr as a template; wherein simple substance metal layer or alloy clad layer are coated on the surface of the kieselguhr. The electromagnetic wave absorption particle material has a grain diameter ranging from 10.1mu m to 154mu m, and the thickness of metal plating ranges from 2mu m to 40mu m. Under the frequency ranging from 2GHz to 18GHz, the electromagnetic wave absorption particle material with kieselguhr has a reflectivity more than -6dB. The electromagnetic wave absorption particle material of the invention is obtained by coating a thin layer of metal on the surface of kieselguhr by the method of chemical plating, the obtained metal particles features regular shape and controllable ingredients; as a result, not only is the proportion of metal material greatly reduced but also the electromagnetic property of metal can be adjusted.

Description

technical field [0001] The invention relates to an electromagnetic wave absorbing material, more particularly, refers to an electromagnetic wave absorbing particle which uses diatomite as a template and deposits metal materials on the template and a preparation method thereof. Background technique [0002] After water pollution, air pollution, and noise pollution, electromagnetic wave radiation pollution has been recognized as the fourth largest pollution in the world. Numerous experts have appealed that in order to solve the electromagnetic pollution nuisance problem and prevent interference and pollution hazards, computer rooms, command rooms, aerospace, weapons and equipment, missile spacecraft, satellite communication systems, telegraph and telephone rooms, radio remote control and measurement systems, ground stations, The national economy and national defense military industry departments such as precision instrument rooms urgently need electromagnetic protection. It is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/00
Inventor 张德远连志阳蔡军张文强袁黎明
Owner BEIHANG UNIV
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