Preparation method for Al2O3 ceramic material having controllable bimodal porous structure

Abstract

The invention relates to a preparation method for an Al2O3 ceramic material having a controllable bimodal porous structure. According to the preparation method, a mass ratio of one pore forming agent to the other pore forming agent to alumina powder in original mixing powder is calculated according to designed volumes of the pore forming agents, and the materials are weighed, wherein the two pore forming agents have different shapes and different materials; the original mixing powder is subjected to ball mill by using a medium ethanol; and steps of drying, screening, molding and sintering are performed to obtain a porous alumina ceramic material. According to the present invention, the pore forming agents with different contents and different shapes are adopted to design and regulate so as to prepare the bimodal porous alumina ceramic material with different porosities and different pore structures, wherein the pore size of large pores can be controlled to a nano-micron scale, the pore size of small pores can be controlled to a nano-scale, the pore structure of the large pores is fibrous, and the pore structure of the small pores is spherical or flat; in addition, the raw material cost is low, the preparation process is simple, and the prepared product can provide a series of materials meeting different requirements for applications in fields of electrodes, artificial bones, catalysts, bioreactors, adsorbents, and the like.

Description

technical field [0001] The invention relates to a method for preparing a porous structure ceramic material, in particular to a controllable bimodal porous structure Al 2 o 3 Preparation method of ceramic material. Background technique [0002] Porous ceramics have excellent filtration, adsorption and desorption properties, high temperature resistance, oxidation resistance, thermal shock resistance and chemical corrosion resistance, which has become one of the hotspots in the current research on porous materials. Its high specific surface area, low density, fluid permeability, high specific strength, low dielectric constant and high thermal shock resistance provide valuable reference for many researchers. In recent years, porous ceramic materials have been widely used in ion and heat exchangers, catalysis, sensors, separation and purification of biomolecules, and refractory linings, filters for molten metal, and biomedical materials. The closed porous material is mainly us...

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Problems solved by technology

These methods all prepare alumina with bimodal pore distribution through the sacrificial template method, but do not involve the porosity and pore structure controllability of the porous alumina

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