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A lithium-aluminum-silicon glass-ceramic/silicon carbide/carbon fiber ternary composite wave-absorbing material and its preparation method

A technology of glass-ceramic and wave-absorbing material, applied in the field of wave-absorbing material

Active Publication Date: 2021-05-28
HARBIN INST OF TECH AT WEIHAI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing preparation methods include chemical vapor deposition, chemical vapor infiltration, and the thermal evaporation method used in the present invention, but lithium aluminum silicon glass-ceramics is used as the matrix of silicon carbide / carbon fiber composite materials, and the premise of ensuring light weight The impedance matching properties of reinforced materials have not been reported before.

Method used

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  • A lithium-aluminum-silicon glass-ceramic/silicon carbide/carbon fiber ternary composite wave-absorbing material and its preparation method
  • A lithium-aluminum-silicon glass-ceramic/silicon carbide/carbon fiber ternary composite wave-absorbing material and its preparation method

Examples

Experimental program
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Embodiment 1

[0027] Embodiment 1: A preparation method of a lithium-aluminum-silicon glass-ceramic / silicon carbide / carbon fiber ternary composite absorbing material, comprising the following preparation steps:

[0028] Step 1. Add polyvinyl alcohol particles to deionized water, heat to 95°C, and stir to obtain a 3wt% polyvinyl alcohol aqueous solution by mass fraction; prepare a 0.005mol / L solution of FeNi50 alloy powder as a catalyst and acetylene black powder adding together to the polyvinyl alcohol aqueous solution, ultrasonically dispersing and mechanically stirring until uniformly mixed to obtain a mixed solution;

[0029] Step 2, impregnating the carbon fiber non-woven fabric in the mixed solution, drying at 45°C after impregnation, wherein the diameter of the carbon fiber is 7 μm;

[0030] Step 3: Grow silicon carbide nanowires on the surface of carbon fibers by thermal evaporation, spread the arsenic powder on the bottom of the alumina crucible, interlock the crucibles of the same ...

Embodiment 2

[0034] Example 2: Lithium-aluminum-silicon glass-ceramics / silicon carbide / carbon fiber ternary composite absorbing material prepared by the method of Example 1, including carbon fiber non-woven fabrics with no silicon carbide nanowires grown on the surface, and silicon carbide nanowires grown on the surface Carbon fiber non-woven fabrics and lithium aluminum silicon glass-ceramics, carbon fiber non-woven fabrics with silicon carbide nanowires grown on the surface covered by lithium aluminum silicon glass-ceramics, and carbon fiber non-woven fabrics without silicon carbide nanowires grown on the surface The diameter of silicon carbide nanowires is 30nm by stacking each other; through subsequent mechanical processing, lithium-aluminum-silicon glass-ceramics / silicon carbide / carbon fiber ternary composite absorbing materials with different thicknesses can be obtained.

[0035] figure 1 (b) and 1(c) are scanning electron micrographs of the intermediate product silicon carbide / carbo...

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Abstract

The invention belongs to the field of wave-absorbing materials, and discloses a lithium-aluminum-silicon glass-ceramic / silicon carbide / carbon fiber ternary composite wave-absorbing material and a preparation method thereof. A thermal evaporation method is used to grow silicon carbide nanowires on the surface of a carbon fiber non-woven fabric. Silicon carbide / carbon fiber non-woven fabrics and carbon fiber non-woven fabrics were respectively impregnated in the slurry prepared by lithium aluminum silicon precursor powder, thickener and surfactant, and vacuum sintered after lamination to obtain lithium aluminum silicon glass-ceramics / Silicon carbide / carbon fiber ternary composite absorbing material. The ternary composite wave-absorbing material of the invention has light weight, simple preparation method, strong wave-absorbing performance, wide absorption frequency band and good impedance matching performance, and is an excellent lightweight microwave-absorbing material.

Description

technical field [0001] The invention relates to the field of wave-absorbing materials, in particular to a lithium-aluminum-silicon glass-ceramic / silicon carbide / carbon fiber ternary composite wave-absorbing material and a preparation method thereof. Background technique [0002] While the rapid development of electromagnetic technology has brought great convenience to human society, it has inevitably produced some problems. For example, if confidential electromagnetic signals cannot be eliminated in time, it may lead to leakage of secrets; electromagnetic wave interference will cause some electronic products to fail to work normally; electromagnetic pollution. In addition, in order to meet the needs of modern warfare, the research of stealth technology has been highly valued by the world's military powers. Therefore, the absorption technology of electromagnetic waves is very important. [0003] Carbon fibers are widely used as electromagnetic wave absorbers due to their g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/00H05K9/00
CPCC09K3/00H05K9/0081
Inventor 夏龙张昕宇杨亚楠
Owner HARBIN INST OF TECH AT WEIHAI
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