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Quartz fiber reinforced concrete quartz microwave-absorbing ceramic stuffed with silicon carbide micro-powder and preparation method thereof

A silicon carbide ceramic and silicon carbide micropowder technology, which is applied in the field of wave absorbing materials and their preparation, can solve the problems of low dielectric constant and dielectric loss, difficult wave absorbing function, etc. Good capacitive effect

Active Publication Date: 2013-11-20
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dielectric constant and dielectric loss of SiO2f / SiO2 composite materials are low, so it is difficult to directly realize the microwave absorption function

Method used

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  • Quartz fiber reinforced concrete quartz microwave-absorbing ceramic stuffed with silicon carbide micro-powder and preparation method thereof
  • Quartz fiber reinforced concrete quartz microwave-absorbing ceramic stuffed with silicon carbide micro-powder and preparation method thereof
  • Quartz fiber reinforced concrete quartz microwave-absorbing ceramic stuffed with silicon carbide micro-powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A quartz fiber-reinforced quartz wave-absorbing ceramic filled with silicon carbide micro-powder according to the present invention, the wave-absorbing ceramic uses silicon dioxide as a matrix, quartz fiber as a reinforcing phase, and silicon carbide micro-powder as a filler, and the silicon carbide micro-powder is α- SiC, purity > 99.9%, the average particle size of silicon carbide powder is 0.5 μm; the volume fraction of the reinforcing phase (preform made of quartz fibers) is 44.7vol.%, and the mass ratio of matrix to silicon carbide powder is 3.6:1.

[0035] The preparation method of the silica fiber-reinforced quartz wave-absorbing ceramics of the silicon carbide micropowder filler of the present embodiment comprises the following steps:

[0036] (1) Material preparation: prepare silica sol, the sol particle size of silica sol is 29nm, solid content is 32.7%, pH value is 3; prepare quartz fiber cloth puncture stitched woven piece, fiber volume fraction 44.7vol.%, Z-...

Embodiment 2

[0044] a kind of like figure 2 The silica fiber-reinforced quartz wave-absorbing ceramics of the present invention shown as silicon carbide powder fillers, the wave-absorbing ceramics use silicon dioxide as a matrix, quartz fibers as a reinforcing phase, silicon carbide powder as a filler, and silicon carbide powder as α -SiC, purity > 99.9%, the average particle size of silicon carbide powder is 0.4 μm; the volume fraction of the reinforcement phase (preform made of quartz fibers) is 45.2vol.%, and the mass ratio of matrix to silicon carbide powder is 1.6:1 .

[0045] The preparation method of the silica fiber-reinforced quartz wave-absorbing ceramics of the silicon carbide micropowder filler of the present embodiment comprises the following steps:

[0046] (1) Material preparation: prepare silica sol, the particle size of silica sol is 26nm, the solid content is 32.7%, and the pH value is 6; prepare the puncture-sewn woven piece of quartz fiber cloth, the fiber volume frac...

Embodiment 3

[0054] A quartz fiber-reinforced quartz wave-absorbing ceramic filled with silicon carbide micro-powder according to the present invention, the wave-absorbing ceramic uses silicon dioxide as a matrix, quartz fiber as a reinforcing phase, and silicon carbide micro-powder as a filler, and the silicon carbide micro-powder is α- SiC, purity > 99.9%, the average particle size of silicon carbide powder is 0.2 μm; the volume fraction of the reinforcement phase (preform made of quartz fibers) is 42.9vol.%, and the mass ratio of matrix to silicon carbide powder is 3 / 5.

[0055] The preparation method of the silica fiber-reinforced quartz wave-absorbing ceramics of the silicon carbide micropowder filler of the present embodiment comprises the following steps:

[0056] (1) Material preparation: prepare silica sol, the sol particle size of silica sol is 32nm, the solid content is 32.7%, and the pH value is 5; prepare the puncture stitched woven piece of quartz fiber cloth, the fiber volume...

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Abstract

The invention discloses quartz fiber reinforced concrete quartz microwave-absorbing ceramic stuffed with silicon carbide micro-powder and a preparation method thereof. The microwave-absorbing ceramic uses silicon dioxide as a base body, uses quartz fiber with 30%-60% of volume fraction as a reinforcement phase and uses the silicon carbide micro-powder as a stuffing. The mass ratio of the base body to the silicon carbide micro-powder is 1:2-4:1. The preparation method comprises the following steps: evenly mixing silica sol and the silicon carbide micro-powder by proportion; sequentially performing vacuum impregnation and pressurized impregnation to a quartz fiber prefabricated part; performing gelling under the vacuum condition; performing high temperature sintering of a gelled prefabricated body; and repeating the impregnation-gelling-sintering process after the sintering till the densification is finished. Microwave-absorbing ceramic is wide in raw material sources, low in cost and simple in preparation, and dielectric constant has a good frequency-dispersion characteristic and can meet the performance requirements of high temperature microwave-absorbing materials.

Description

technical field [0001] The invention relates to a wave-absorbing material and its preparation, in particular to a quartz fiber-reinforced quartz wave-absorbing ceramic and a preparation method thereof. Background technique [0002] Microwave absorbing materials refer to a class of materials that can absorb electromagnetic wave energy projected onto its surface and convert it into heat energy through material loss. Such materials have been widely used in fields such as electromagnetic shielding and stealth technology. [0003] According to different service environments, microwave absorbing materials can be divided into room temperature absorbing materials and high temperature absorbing materials. [0004] At present, the research and development of high-temperature wave-absorbing materials at home and abroad are mainly concentrated on ceramic matrix composite materials. Among them, silicon carbide fiber-reinforced silicon carbide composite materials are an ideal choice, but...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/622C04B35/14
Inventor 刘海韬程海峰田浩周永江
Owner NAT UNIV OF DEFENSE TECH
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