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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, achieve low cost, ensure mechanical properties, and be simple and easy line effect

Active Publication Date: 2020-01-17
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • 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

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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 the first aspect, according to an embodiment of the present invention, there is provided a method for preparing homogenized alumina ceramics, the method comprising the following steps:

[0032] S1, preparation of mixed slurry,

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

[0034] S2, preparing homogeneous alumina ceramics, including:

[0035] injecting the mixed slurry into a mold and controlling the mold to be rapidly suspended in a liquid nitrogen environment, so that the mixed slurry is solidified and formed to obtain a green body;

[0036] The green body is demoulded and post-treated to obtain homogeneous alumina ceramics.

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

Embodiment 1

[0062] Step 1: Slurry preparation, mixing polyvinylpyrrolidone, silica sol with a concentration of 15wt%, pH of 3.6, and alumina ceramic powder at a mass ratio of 1.1:43.9:55 and ball milling to obtain alumina ceramic slurry; The alumina ceramic powder contains 10wt% of particles with an average particle diameter of 50nm and 90wt% of particles with an average particle size of 50nm, and the ball milling time is 28h.

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

Embodiment 2

[0065] Step 1: slurry preparation, mixing polyvinylpyrrolidone, silica sol with a concentration of 15wt%, pH of 3.6, and alumina ceramic powder at a mass ratio of 2.5:42.5:55 and ball milling to obtain alumina ceramic slurry; The alumina ceramic powder contains 10wt% of particles with an average particle diameter of 50nm and 90wt% of particles with an average particle size of 50nm, and the ball milling time is 28h.

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

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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...

Claims

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Application Information

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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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