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Ceramic sponge material method for preparing nanowire woven microspheres by reverse template method

A technology of ceramic sponge and nanowire, which is applied in the field of ceramic materials and achieves the effect of simple preparation process

Active Publication Date: 2018-12-07
北京华圻生态科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on new ceramic sponge materials is in its infancy, and most of them focus on metal oxide systems, Si, which has excellent room temperature and high temperature mechanical, thermal and chemical stability properties. 3 N 4 , SiC ceramic system is less reported

Method used

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  • Ceramic sponge material method for preparing nanowire woven microspheres by reverse template method
  • Ceramic sponge material method for preparing nanowire woven microspheres by reverse template method
  • Ceramic sponge material method for preparing nanowire woven microspheres by reverse template method

Examples

Experimental program
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Effect test

Embodiment 1

[0017] A kind of reverse template method prepares the ceramic sponge material method of nanowire weaving microsphere, comprises the steps:

[0018] (1) Add water-soluble carbon black with 40 wt% mass of silica sol particles to 20 wt% alkaline silica sol (average particle size: 20nm), and mix for 12 hours with a planetary ball mill.

[0019] (2) Add 0.1 wt.% dodecyltrimethylammonium bromide to the above slurry, and adjust the pH to 11.5.

[0020] (3) Foaming the slurry at a rotational speed of 1500-2000 rpm for 20 minutes by mechanical stirring to obtain a stable foam slurry of silica sol and carbon black particles.

[0021] (4) keep the humidity in a constant temperature and humidity box as 70%, and the temperature is 20°C to dry the particle-stabilized foam to obtain a porous green body, such as figure 1 shown. Its microstructure is as figure 2 shown.

[0022] (5) The foam body obtained above was reacted and sintered in an atmospheric nitrogen environment, heated to 1650...

Embodiment 2

[0024] A kind of reverse template method prepares the ceramic sponge material method of nanowire weaving microsphere, comprises the steps:

[0025] (1) Add water-soluble carbon black with a mass of 70 wt% of silica sol particles to 5 wt% alkaline silica sol (average particle size: 50 nm), and mix for 12 hours using a planetary ball mill.

[0026] (2) Add 0.5wt% cetyltrimethylammonium chloride to the above slurry to adjust the pH to 9.0.

[0027] (3) Foaming the slurry at a rotational speed of 1500-2000 rpm for 5 minutes by mechanical stirring to obtain a stable foam slurry of silica sol and carbon black particles.

[0028] (4) Dry the foam in a constant temperature and humidity box in an environment of 95% humidity and 35° C. to obtain a dry billet.

[0029] (5) Sinter the foam body obtained above under an argon atmosphere at normal pressure, heat it to 1450°C at a heating rate of 0.5°C / min, and then keep it warm for 5h. The prepared SiC nanowire braided microspheres are as f...

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Abstract

The invention discloses a ceramic sponge material method for preparing Si3N4 / SiC nanowire woven microspheres by a reverse template method. The method comprises the following steps: (1) taking silica sol and water-soluble carbon black as initial raw materials, and performing ultrasonic dispersion or ball milling to prepare uniformly dispersed mixed slurry; (2) adding a surfactant into the mixed slurry obtained in the step (1), and foaming to obtain ultra-stable foam; (3) drying the foam obtained in the step (2) so as to obtain a foam body formed by silica sol nano-particles and carbon black nano-particles; and (4) carrying out a carbon thermal reduction reaction on the foam body obtained in the step (3), thereby obtaining the nanowire woven microspheres. The invention provides a low-cost preparation method of the nanowire woven microspheres, the preparation process is simple, and expensive equipment is not needed.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and specifically relates to a method for preparing a novel ceramic sponge material made of nanowire-woven microspheres by using a particle-stabilized foam body as a reverse template and combining with carbothermal reduction reaction. Background technique [0002] With the development of science and technology, the requirements for material performance have been continuously improved, and porous materials with three-dimensional nanostructure, ultra-high specific surface area, and ultra-light have emerged, such as carbon nanotube aerogels, polymer foams, and micro-lattice metals. Due to its low density, high porosity, high specific surface area, and excellent thermal / chemical stability, ceramic airgel materials have broad application prospects in the fields of heat insulation, catalyst support, filtration, and lightweight structural parts. The classic ceramic airgel is composed of metal o...

Claims

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Application Information

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IPC IPC(8): C04B38/10C04B35/591C04B35/573C04B35/622
CPCC04B35/573C04B35/591C04B35/622C04B38/10C04B2235/6562C04B2235/6567
Inventor 杨金龙霍文龙张笑妍陈雨谷席小庆王亚利
Owner 北京华圻生态科技有限公司
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