Method for preparing porous alumina ceramic by gel casting method

Abstract

The invention discloses a method for preparing porous alumina ceramic by a gel casting method. The method comprises the following steps: adding aluminum isopropoxide into isopropanol, and uniformly stirring to form a dissolving solution; spraying distilled water into the dissolved solution, and carrying out ultrasonic reaction to obtain an emulsion; adding polyvinyl alcohol into distilled water, uniformly stirring, then adding hyaluronic acid and high-substituted hydroxy propyl cellulose, carrying out constant-temperature ultrasonic treatment, and cooling to obtain a gel solution; dropwise adding the gel liquid into the emulsion, carrying out microwave reaction and heating treatment to form a suspended dispersion liquid, and then carrying out distillation treatment to obtain viscous slurry; and transferring the viscous slurry into a grinding mold, slowly heating, carrying out heat preservation treatment, cooling, demolding to obtain a biscuit, and sintering the biscuit to obtain the porous alumina ceramic. According to the preparation method, the defects of the existing aluminum oxide ceramic are overcome, aluminum isopropoxide is used as an aluminum source to form an emulsion of aluminum hydroxide as a precipitate and an aluminum isopropoxide liquid film, and a porous ceramic structure is formed through a gel system, so that the connectivity and the overall firmness of the aluminum oxide ceramic are greatly improved.

Description

technical field [0001] The invention belongs to the field of ceramics, and in particular relates to a method for preparing porous alumina ceramics by gel injection molding. Background technique [0002] Gel injection molding technology can prepare complex shaped ceramic parts with uniform density, large size and high precision. This method has the advantages of simple process and low cost. So far, in the research on gel injection molding at home and abroad, ceramic materials such as alumina, silicon carbide, silicon nitride, and titanium nitride are mostly used. The green body prepared by the traditional colloidal molding process usually shrinks more during the drying process Large, resulting in problems such as deformation and cracking of the green body during the drying process; and due to the low strength of the formed green body, the green body is easily damaged during the demolding process, especially for large-sized, complex-shaped shaped green bodies sometimes even U...

AI Technical Summary

Problems solved by technology

So far, in the research on gel injection molding at home and abroad, ceramic materials such as alumina, silicon carbide, silicon nitride, and titanium nitride are mostly used. The green body prepared by the traditional colloidal molding process usually shrinks more during the drying process. Large, resulting in problems such as deformation and cracking of the green body during the drying process; and due to the low strength of the formed green body, the green body is easily damaged during the demolding process, especially for large-sized, complex-shaped shaped green bodies sometimes even Unable to demould; ceramic materials inevitably shrink in size during the molding, drying and sintering process