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Low-temperature co-firing ceramic wave-absorbing material and preparation method thereof

A technology of low-temperature co-fired ceramics and wave-absorbing materials, applied in reactors, nuclear engineering, shielding, etc., can solve problems such as damage shape, difficulty in film formation, poor effect of sheet-shaped wave-absorbing materials, etc., and achieve good wave-absorbing performance and process Simple, Widely Applicable Effects

Active Publication Date: 2011-10-19
WEIFANG JIANA NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the heat resistance of resin-based absorbing materials is not ideal, so it is difficult to apply to instruments that are prone to heat
[0004] In the prior art, the electromagnetic wave absorber is generally casted on the base material by ordinary wet casting (casting through a casting knife) to form a film, but this method is very ineffective in dealing with thin and soft sheet-shaped absorbing materials. , not only is it difficult to form a film, but it will even destroy its shape when dealing with fiber absorbing materials

Method used

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  • Low-temperature co-firing ceramic wave-absorbing material and preparation method thereof
  • Low-temperature co-firing ceramic wave-absorbing material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0028] Firstly, the low temperature co-fired ceramic nanopowder raw material is dispersed in a solvent to prepare a ceramic slurry.

[0029] The solvent is water, so that the prepared ceramic slurry has a certain viscosity and fluidity, so that it can be removed in the subsequent low-temperature sintering process without affecting the performance of the finished product.

[0030] The ceramic nanopowder adopts low-temperature co-fired glass ceramics that can be sintered in an inert atmosphere filled with nitrogen.

[0031] Then, the ceramic slurry is cast into a film on the glass fiber cloth sheet-like wave-absorbing material mixed with carbon fibers through a waterfall casting process. The waterfall casting process is to store the ceramic slurry in a container at a high place, and a slit is opened at the lower end of the container, and the ceramic slurry passes through the slit at a certain speed due to gravity or extrusion from above to form a casting waterfall; A conveyor b...

Embodiment 2

[0036] Firstly, the low temperature co-fired ceramic nanopowder raw material is dispersed in a solvent to prepare a ceramic slurry.

[0037] Various organic solvents can be used as the solvent, so that the prepared ceramic slurry has a certain viscosity and fluidity. It is advisable to use a mixed organic solvent that can be removed in the subsequent low-temperature sintering process without affecting the performance of the finished product.

[0038] Ceramic nanopowder adopts low-temperature co-fired ceramic nanopowder mixed with absorbing fiber or metal, and low-temperature co-fired glass ceramics that can be sintered in a reducing atmosphere filled with hydrogen.

[0039] Then, the ceramic slurry is cast into a film on the glass fiber cloth sheet-like wave-absorbing material mixed with carbon fibers through a waterfall casting process. The waterfall casting process is to store the ceramic slurry in a container at a high place, and a slit is opened at the lower end of the con...

Embodiment 3

[0044] Firstly, the low temperature co-fired ceramic nanopowder raw material is dispersed in a solvent to prepare a ceramic slurry.

[0045] An organic solvent is used as the solvent, so that the prepared ceramic slurry has a certain viscosity and fluidity, and it is advisable to use a mixed organic solvent that can be removed in the subsequent low-temperature sintering process without affecting the performance of the finished product.

[0046] Ceramic nanopowder adopts low-temperature co-fired ceramic nanopowder mixed with oxide powder, preferably low-temperature co-fired glass ceramics that can be sintered in a reducing atmosphere, to further optimize the absorbing performance.

[0047] Then, the ceramic slurry is cast into a film on the glass fiber cloth sheet-like wave-absorbing material mixed with carbon fibers through a waterfall casting process. The waterfall casting process is to store the ceramic slurry in a container at a high place, and a slit is opened at the lower...

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Abstract

The invention discloses a preparation method of a low-temperature co-firing ceramic wave-absorbing material. The method is characterized by comprising the following steps: casting ceramic slurry on a flaky wave-absorbing material by utilizing a waterfall casting process, and then filming; and laminating multiple pieces of flaky wave-absorbing materials with ceramic films and then carrying out low-temperature sintering at the temperature less than 1000 DEG C. According to the method provided by the invention, the low-temperature co-firing ceramic wave-absorbing material is prepared by using the waterfall casting process and the low-temperature sintering process, thus the method is low in cost, simple in process and suitable for industrial production. The finished product obtained finally has the advantages of good wave-absorbing property and certain high temperature resistant performance because the finished product is made of a ceramic base, thereby achieving wide application.

Description

technical field [0001] The invention relates to a low-temperature co-fired ceramic wave-absorbing material and a manufacturing method thereof, in particular to a low-temperature co-fired ceramic wave-absorbing material with a monolithic structure obtained by waterfall casting and a manufacturing method thereof. Background technique [0002] Absorbing materials (electromagnetic wave absorbing materials) are functional materials that can convert electromagnetic wave energy into other forms of energy and dissipate them. They have broad applications in military and civilian fields such as microwave anechoic chambers, electromagnetic compatibility, radar antennas, and weapon system stealth. prospect. Absorbing materials are generally composed of electromagnetic wave absorbing agents and matrix materials. The key to determining their absorbing performance lies in the absorbing agent. At present, fiber absorbing agents such as carbon fiber and silicon carbide fiber are optimistic i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622G21F1/06
Inventor 童春媛房玉礼
Owner WEIFANG JIANA NEW MATERIALS
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