Foam glass-based microwave absorbing material added with metal powder

A technology of microwave absorbing materials and foam glass, which is applied in other chemical processes, chemical instruments and methods, etc., can solve the problems of electromagnetic wave loss substances that have not been seen yet, achieve excellent electromagnetic wave absorption performance, broaden the variety and selection range, prepare and burn The effect of low temperature

Inactive Publication Date: 2012-06-27
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, the electromagnetic loss substances added to foam glass are limited to silicon carbide, graphite, conductive carbon black, ferrite, zinc powder and zinc oxide, and no patents or patents on other electromagnetic loss substances added to foam glass have been seen. Literature related reports

Method used

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  • Foam glass-based microwave absorbing material added with metal powder
  • Foam glass-based microwave absorbing material added with metal powder
  • Foam glass-based microwave absorbing material added with metal powder

Examples

Experimental program
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Effect test

preparation example Construction

[0022] The above-mentioned embodiments are prepared by the preparation method of the present invention. First, the corresponding raw materials are weighed according to the formula ratio, and then mixed evenly and finely ground to obtain the material to be fired. The dry grinding method or the wet grinding method can be adopted, and the mixture is wet-milled with water as the ball milling medium, and the mixture is fully mixed. For example, the amount of water added per 50g of the material to be fired is 50ml, and the grinding balls used are zirconia grinding balls. The amount of grinding balls to be added is based on the mass ratio of the material to be fired: the grinding balls is 1:3, and the ball is milled for 3 hours at a speed of 600r / min. When the obtained slurry is heated and dried in a drying oven, prevent the slurry from caking Formed, the mixture should be turned and smashed from time to time. The dry batch obtained is dry-milled, and the grinding balls used are zirc...

Embodiment 1

[0029] The dielectric constant of the sample is between 4.54-5.05, the dielectric loss is between 3.19-4.15, the real part of the complex permeability is between 0.96-1.04, and the imaginary part of the complex permeability is between 0.029-0.024. The reflection coefficient of the sample with a thickness of 3.5mm is lower than -10dB in the frequency range of 8-13GHz. The absorbing curve is shown in Figure-1.

Embodiment 2

[0031] The dielectric constant of the sample is between 3.95-3.82, the dielectric loss is between 0.87-0.91, the real part of the complex magnetic permeability is between 0.97-1.04, and the imaginary part of the complex magnetic permeability is between 0.1-0.11. The reflection coefficient of the sample with a thickness of 4mm is lower than -7dB at 8-13GHz, and the frequency band with the reflection coefficient lower than -10dB is 9-11.5GHz. The absorbing curve is shown in Figure-2.

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Abstract

The invention discloses a foam glass-based microwave absorbing material added with metal powder, which comprises the following raw components in percentage by mass: 58-62 percent of silicon dioxide, 3-6 percent of aluminium oxide, 3-6 percent of potassium hydroxide, 13-16 percent of sodium hydroxide, 14-20 percent of boracic acid, 0.5-3 percent of graphite, and in addition, 5-35 percent of metal powder, wherein the metal powder can be one or a mixture of cobalt, nickel and copper. According to the method disclosed by the invention, the preparation cost is low, the required raw materials are easy to buy, the operation process is simple, the preparation firing temperature is lower, and the obtained absorbing material has excellent electromagnetic wave absorption performance. The foam glass-based microwave absorbing material is mainly applied to radiation protection of building materials, electromagnetic shielding of microwave heaters, electronic instruments and equipment, and the like, so that the electromagnetic wave radiation pollution is reduced; and the foam glass-based microwave absorbing material also can be applied to stealthy technique, information and communication technology security and microwave unreflected chamber militarily and other fields.

Description

technical field [0001] The invention relates to a material for absorbing electromagnetic waves and a preparation method thereof, in particular to a composite electromagnetic wave absorbing material based on foam glass and a preparation method thereof. Background technique [0002] With the rapid development of the electronics industry, radio and television and radio communication transmitters, high-voltage substations, industrial, technological, medical high-frequency equipment, personal radio communication equipment and some household appliances have been widely used, which greatly facilitates people's lives, but These instruments and equipment produce increasingly serious electromagnetic radiation pollution during the working process. Electromagnetic radiation pollution is very harmful to people's health and the normal use of instruments. Electromagnetic wave absorbing materials can absorb and attenuate electromagnetic waves generated by various instruments and equipment, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00
Inventor 李志宏陈阔李秀华朱玉梅孙春晓武卫杰
Owner TIANJIN UNIV
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