Preparation method of carbon nanotube modified foamed ceramics

Abstract

The invention provides a preparation method of carbon nanotube modified foamed ceramics. The preparation method comprises the following steps: adding inorganic ceramic particles and cationic surface active agent into deionized water, stirring at a high speed, enabling the cationic surface active agent to cover the surface of the inorganic ceramic particle, and then filtering and drying to obtain inorganic ceramic particles with positive charge; adding the inorganic ceramic particles and carbon nanotube into deionized water, enabling the inorganic ceramic particles with the positive charge to have electrostatic adsorption with carbon nanotube, and then filtering and drying to obtain composite powder; grinding the composite powder together with organic resin, performing hot pressing and sintering under the protection of nitrogen to obtain the carbon nanotube modified foamed ceramics. The carbon nanotube modified foamed ceramics are used as a reinforcing phase, so that on one hand, an effect of flexibilizing a foamed ceramic substrate can be achieved; on the other hand, the sound wave can be bounced for multiple times in a hollow structure of the carbon nanotube, so that a denoising effect can be realized. The preparation method is high in practicability.

Description

technical field [0001] The invention belongs to the field of ceramic materials, and specifically refers to a preparation method of carbon nanotube modified foam ceramics. Background technique [0002] Alumina ceramics are a kind of Al 2 o 3 It is a ceramic material with corundum as the main crystal phase as the main raw material. Because of its high mechanical strength, high hardness, low high-frequency dielectric loss, high high-temperature insulation resistance, chemical corrosion resistance and good thermal conductivity, it has excellent comprehensive technical performance and other advantages. Ceramic foam is a porous ceramic body with high porosity and three-dimensional grid structure. Because of its high porosity, large specific surface area, thermal shock resistance, high temperature resistance, chemical corrosion resistance and good mechanical strength and filtration and adsorption properties, it can be Widely used in heat exchange materials, gas distribution mate...

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Problems solved by technology

The main reason may be that on the one hand, carbon nanotubes are difficult to disperse, and on the other hand, carbon nanotubes are in the form of fibers, while ordinary ceramic particles are in the shape of hard spheres that are difficult to deform. It is impossible to combine the two together by traditional powder metallurgy methods.

Xu Yong's master's thesis of Anhui University of Science and Technology "Dispersion of Carbon Nanotubes and Research on Alumina Matrix Composite Materials" used the in-situ growth method to combine carbon nanotubes with alumina particles, but due to the need to consider the pH value, the preparation The process is relatively complicated, and the material properties are highly sensitive to external factors, which is not conducive to mass production

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