Homogenized alumina ceramic and preparation method thereof

Abstract

The invention provides a homogenized alumina ceramic and a preparation method thereof. In the prior art, the homogenized alumina ceramic cannot be obtained by the existing preparation method. A purpose of the invention is to solve the technical problem in the prior art. The preparation method comprises: preparing a mixed slurry, wherein a silica sol, a water-soluble macromolecular organic matter and aluminum oxide ceramic powder are sequentially and uniformly mixed according to a certain mass ratio to obtain a mixed slurry; and preparing a homogenized alumina ceramic, wherein the obtained mixed slurry is injected into a mold, the mold is controlled to rapidly suspend in a liquid nitrogen environment to cure and mold the mixed slurry so as to obtain a billet, demolding the billet, and carrying out post-treatment to obtain the a homogenized alumina ceramic.

Description

technical field

[0001] The invention belongs to the technical field of preparation of functional ceramics, in particular to a homogenized alumina ceramic and a preparation method thereof. Background technique

[0002] Alumina ceramics have the advantages of high mechanical strength, high resistivity, good electrical insulation, high melting point, good corrosion resistance, excellent chemical stability, etc., and are widely used in machinery, electronic power, chemical industry, medicine, construction and other high-tech fields .

[0003] At present, the preparation methods of alumina ceramics include: isostatic pressing molding, dry pressing molding, extrusion molding, tape casting, grouting molding, gel injection molding, freezing molding, freezing gelling molding, etc. Among them, the commonly used methods are extrusion molding, grouting molding, and freeze molding. The amount of solvent and binder in the extrusion molding slurry is relatively high, which makes the green...

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