A preparation method of alumina porous ceramic membrane with adjustable pore shape

Abstract

The preparation method of the alumina porous ceramic membrane with adjustable pore shape disclosed by the present invention includes: uniformly dispersing carbon substances in absolute ethanol to obtain a carbon suspension; dissolving aluminum nitrate and ammonium bicarbonate respectively to form a solution, and Under magnetic stirring, add the ammonium bicarbonate solution dropwise to the aluminum nitrate solution, and mix well; then add the carbon suspension dropwise to the above mixed solution, and disperse it evenly through ultrasonic vibration; adjust the pH value to acidic, and then add PAA solution, stirring and mixing to make it into a sol, and obtain a xerogel; after granulation, molding, insulation to remove organic matter, and then isostatic pressing, then put it in a high-temperature furnace and sinter in multiple temperature sections to obtain alumina porous ceramics membrane. When carbon black is used as the carbon material, the pore diameter of the ceramic membrane can reach 10-30nm. The porous ceramic membrane prepared by the invention has the characteristics of uniform pore distribution, controllable pore shape, small pore diameter, high bending strength, etc., and has important application prospects in the fields of sewage filtration, air purification and the like.

Description

technical field [0001] The invention relates to a method for preparing porous materials, in particular to a method for preparing porous alumina ceramic membranes with adjustable pore shapes, and belongs to the technical field of material science. Background technique [0002] Porous ceramics is a new type of material that has received widespread attention in recent years. Because of its unique pore structure that can realize a variety of functional properties, it is also called porous functional materials. Porous ceramics not only have excellent stability and high temperature corrosion resistance, but also have the advantages of large specific surface area, high porosity, high permeability, low electrical conductivity, etc., and can be used as filter materials, catalyst carriers, insulation insulation, etc. Thermal materials, biological functional materials, etc., have been widely used in chemical industry, energy, metallurgy, biomedicine, environmental protection, aerospace...

AI Technical Summary

Problems solved by technology

However, the current alumina porous ceramics have large pore diameters and high sintering temperatures, which are very unfavorable for their application fields, energy saving and environmental protection.

In addition, it has not been reported that alumina porous ceramics with different pore types can be obtained by adding different carbon substances to the sintering process of alumina porous ceramics.