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Porous glass ceramic capable of absorbing electromagnetic waves and preparation method thereof

A technology of porous glass ceramics that absorbs electromagnetic waves, applied in chemical instruments and methods, other chemical processes, etc., can solve problems such as performance degradation, and achieve the effects of low cost, good durability, and high strength

Inactive Publication Date: 2016-04-20
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] Generally, the performance of organic thermal insulation materials is degraded under humid conditions, so inorganic porous thermal insulation materials have become a better choice.

Method used

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  • Porous glass ceramic capable of absorbing electromagnetic waves and preparation method thereof
  • Porous glass ceramic capable of absorbing electromagnetic waves and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Weigh 5kg of flat glass powder, 2kg of ceramic granulation powder, 10g of silicon carbide, 10g of antimony trioxide, 3kg of ferrite, 100g of graphite, and 100g of SiC fiber, and place them in a ball mill for dry grinding for 3 hours. Materials to be fired; apply calcined kaolin evenly on a 660*660*240mm detachable mold as a release agent to prevent the foamed sample from adhering to the mold and making it difficult to take it out; pour the materials to be fired into the mold and Spread evenly so as to be able to foam evenly; adjust the temperature system of the tunnel kiln. Cool at 15°C / min to 600°C, perform annealing treatment, and keep it warm for 1h, then cool to room temperature at 0.1°C / min to obtain the required radar wave absorbing material, and cut the sample for performance testing . The compressive strength of the prepared porous glass-ceramic-based radar wave absorbing material is 2.5MPa, which is much higher than that of general foam glass materials. The h...

Embodiment 2

[0041] Weigh 7.5kg of frit glass powder, 2kg of ceramic granulation powder, 20g of silicon carbide, 30g of antimony trioxide, 300g of SiC fiber, 500g of ferrite, and 300g of graphite, and place them in a ball mill for dry grinding. The ball milling time is 3 hours. That is to get evenly mixed materials to be fired; apply calcined kaolin evenly on the removable mold of 660*660*240mm as a release agent; pour the materials to be fired into the mold and spread them evenly; adjust the temperature system of the tunnel kiln , the temperature is raised from room temperature to 650°C at a rate of 5°C / min, and kept for 80 minutes, then raised to 900°C at a rate of 6°C / min, and kept for 40 minutes, then cooled to 500°C at a rate of 8°C / min, annealed, and kept After cooling for 6 hours to room temperature at 0.5°C / min, the required radar wave absorbing material can be obtained, and the sample is cut for performance testing. The compressive strength of the prepared porous glass-ceramic-bas...

Embodiment 3

[0043] Weigh 7kg of frit glass powder, 0.5kg of ceramic granulation powder, 30g of silicon carbide, 50g of antimony trioxide, 200g of SiC fiber, 2.5kg of ferrite, and 400g of graphite in a ball mill for dry grinding. The ball milling time is 2 hours. Take out After that, the uniformly mixed materials to be fired are obtained; evenly smear calcined kaolin on the removable mold of 660*660*240mm as a release agent; pour the materials to be fired into the mold and spread them evenly; adjust the temperature of the tunnel kiln System, the temperature is raised from room temperature to 550°C at 2°C / min, and kept for 40 minutes, then raised to 900°C at 6°C / min, kept for 20 minutes, then cooled to 600°C at 10°C / min, annealed, and Keep warm for 3 hours, and then cool down to room temperature at 0.2°C / min to obtain the required radar wave absorbing material, and cut the sample for performance testing. The compressive strength of the prepared porous glass-ceramic-based radar wave absorbin...

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Abstract

The invention provides a porous glass ceramic capable of absorbing electromagnetic waves and a preparation method thereof, and relates to the field of preparation of inorganic non-metallic materials. The porous glass ceramic is used for preventing and absorbing the electromagnetic waves. The preparation method comprises the steps that cullet, ceramic granulation powder, silicon carbide and antimonous oxide are adopted to serve as base materials of an inorganic porous material, one or more of graphite, ferrite and SiC fiber serve as media for dissipating the electromagnetic waves, ball-milling mixing is conducted on the base materials and the media for dissipating the electromagnetic waves, foaming of the base materials is achieved at certain temperature, and the inorganic porous radar wave absorbing material is formed finally. By means of the porous glass ceramic capable of absorbing the electromagnetic waves and the preparation method thereof, the plate-shaped or special-shaped machined radar wave absorbing material which is lightweight, high in strength, capable of keeping heat and insulating the heat and excellent in wave absorbing property can be obtained.

Description

technical field [0001] The invention relates to the preparation of porous glass ceramics and a compound preparation method of porous glass ceramics and wave absorbing agent. Background technique [0002] At present, there are two main ways to effectively suppress and prevent electromagnetic radiation: electromagnetic wave shielding and electromagnetic wave absorption. The former mainly attenuates electromagnetic waves in the form of reflected electromagnetic wave energy, while the latter attenuates electromagnetic waves by converting electromagnetic wave energy into other forms of energy. [0003] Electromagnetic shielding technology generally uses low-resistance metal good conductors or conductive resin materials to form an effective closed area, making it difficult for external electromagnetic waves to enter, and internal electromagnetic waves are not easy to leak out, and use metal conductors to emit and absorb electromagnetic radiation. To achieve the purpose of suppres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C11/00C03C14/00C04B35/26C04B38/02C09K3/00
CPCC03C14/004C03C11/007C03C2214/02C03C2214/04C04B35/26C04B38/02C04B2235/3294C04B2235/349C04B2235/36C04B2235/3826C04B2235/425C04B2235/5244C04B2235/6562C04B2235/6567C04B2235/662C09K3/00
Inventor 孙诗兵高乔田英良贾治勇黄石明张继光
Owner BEIJING UNIV OF TECH
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