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Homogenized alumina ceramic and preparation method thereof

A technology of alumina ceramics and alumina ceramic powder, which is applied in the field of homogenized alumina ceramics and its preparation, can solve the problems of inability to obtain homogenized alumina ceramics, etc., and achieves low cost, improved uniformity, and heat export. easy effect

Active Publication Date: 2022-08-09
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a homogenized alumina ceramic and its preparation method, which can solve the technical problem that the existing preparation method cannot obtain homogenized alumina ceramics

Method used

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  • Homogenized alumina ceramic and preparation method thereof
  • Homogenized alumina ceramic and preparation method thereof
  • Homogenized alumina ceramic and preparation method thereof

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preparation example Construction

[0030] As mentioned above, the present invention provides a homogenized alumina ceramic and a preparation method thereof.

[0031] In a first aspect, according to an embodiment of the present invention, a method for preparing a homogenized alumina ceramic is provided, the method comprising the following steps:

[0032] S1, prepare mixed slurry,

[0033] Mix a certain mass ratio of silica sol, water-soluble organic matter and alumina ceramic powder in turn to obtain a mixed slurry;

[0034] S2. Preparation of homogeneous alumina ceramics, including:

[0035] injecting the mixed slurry into a mold and controlling the mold to rapidly suspend in a liquid nitrogen environment to solidify the mixed slurry to obtain a green body;

[0036] The green body is demolded and post-treated to obtain a homogeneous alumina ceramic.

[0037] In the above preparation method, as the liquid phase for preparing the slurry, the silica sol can be an alkaline silica sol or an acidic silica sol, whi...

Embodiment 1

[0062] Step 1: Slurry preparation, mix polyvinylpyrrolidone, silica sol with a concentration of 15wt%, and a pH of 3.6, and alumina ceramic powder in a mass ratio of 1.1:43.9:55, and perform ball milling to obtain alumina ceramic slurry; wherein The alumina ceramic powder contained 10 wt % of particles with an average particle size of 50 nm and 90 wt % of particles with an average particle size of 2 μm, and the ball milling time was 28 h.

[0063] Step 2: Preparation of homogenized alumina ceramics, the above slurry was degassed in a vacuum for 20 minutes and injected into the mold, and it was quickly suspended in liquid nitrogen and fully cured for 0.5 hours, and then demoulded to obtain a green body; the green body was dried at room temperature for 24 hours, 1500 The homogenized alumina ceramic material can be prepared by sintering at ℃ for 2 h.

Embodiment 2

[0065] Step 1: Slurry preparation, mix polyvinylpyrrolidone, silica sol with a concentration of 15 wt %, pH 3.6, and alumina ceramic powder in a mass ratio of 2.5:42.5:55 and perform ball milling to obtain alumina ceramic slurry; wherein The alumina ceramic powder contained 10 wt % of particles with an average particle size of 50 nm and 90 wt % of particles with an average particle size of 2 μm, and the ball milling time was 28 h.

[0066] Step 2: Preparation of homogenized alumina ceramics, the above slurry was degassed in a vacuum for 20 minutes and injected into the mold, and it was quickly suspended in liquid nitrogen and fully cured for 0.5 hours, and then demoulded to obtain a green body; the green body was dried at room temperature for 24 hours, 1500 The homogenized alumina ceramic material can be prepared by sintering at ℃ for 2 h.

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Abstract

The invention provides a homogenized alumina ceramic and a preparation method thereof, which can solve the technical problem that the existing preparation method cannot obtain the homogenized alumina ceramic. Wherein, the preparation method of homogenized alumina ceramics includes: preparing mixed slurry: sequentially mixing silica sol, water-soluble macromolecular organic matter and alumina ceramic powder in a certain mass ratio to obtain a mixed slurry; preparing homogeneous oxidation Aluminum ceramics, comprising: injecting the mixed slurry into a mold and controlling the mold to rapidly suspend in a liquid nitrogen environment to solidify the mixed slurry to obtain a green body; demolding the green body and performing The homogeneous alumina ceramic is obtained after treatment.

Description

technical field [0001] The invention belongs to the technical field of functional ceramic preparation, 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, and excellent chemical stability. They 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, dry pressing, extrusion, tape casting, grouting, gel injection molding, freeze forming, freeze gel forming, and the like. Among them, the commonly used methods are extrusion molding, grouting molding and freezing molding. The amount of solvent and binder in the extrusion molding slurry is relatively high, which makes the green body shrink greatly during drying...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/117C04B35/622C04B35/634C04B35/636B28B1/00
CPCC04B35/117C04B35/622C04B35/63444C04B35/6365B28B1/007C04B2235/3418C04B2235/5454C04B2235/5445C04B2235/5436C04B2235/656C04B2235/6567
Inventor 董衡孙志强韩耀肖振兴王涛李淑琴吕毅张剑张昊
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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