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Porous alumina ceramics and its preparation method and application

A technology of porous alumina and alumina powder, applied in the field of ceramic materials, can solve the problems of excessive surface resistance, poor air permeability, low porosity, etc., and achieve the effect of shortening service life, improving strength and high porosity

Active Publication Date: 2020-04-03
SHENZHEN SUNTECH ADVANCED CERAMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main molding technologies of porous alumina ceramics are dry pressing molding, extrusion molding, injection molding, grouting molding, gel injection molding and other methods. Porous ceramics in the field not only require high porosity, uniform distribution of pores, good air permeability, high strength and good wear resistance, but also require a certain anti-static function (that is, the surface resistance is 10 4 ~10 10 Ω), and the porous alumina ceramics prepared by the above method either have low porosity, low strength, poor air permeability, or excessive surface resistance (10 11 Ω), limiting its development

Method used

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  • Porous alumina ceramics and its preparation method and application
  • Porous alumina ceramics and its preparation method and application

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preparation example Construction

[0024] Such as figure 1 Shown, the preparation method of the porous alumina ceramics of one embodiment, comprises the following steps:

[0025] Step S110: weighing raw materials.

[0026] Wherein, according to the mass percentage, the raw material includes the following components: 40% to 90% of the particle size (ie, the median particle diameter D 50 40 microns to 200 microns) 40 microns to 200 microns of alumina powder, 1% to 40% of the particle size (ie, the median particle size D 50 10 micron to 80 micron), 10 micron to 80 micron pore forming agent, 2% to 20% sintering aid and 3% to 30% conductive powder.

[0027] By using alumina powder with a particle size of 40 microns to 200 microns as the main raw material, and adding the above-mentioned pore-forming agent, sintering aid and conductive powder with a particle size of 10 microns to 80 microns, the smaller particle size Alumina particles, pore-forming agent particles, sintering aid particles and conductive powder part...

Embodiment 1

[0059] The preparation process of the ceramic sheet of the present embodiment is as follows:

[0060] (1) Weighing the raw material, the raw material is composed of the following components according to mass percentage: 40% of the particle size is 40 microns to 200 microns of alumina powder, 10% of the particle size is 10 microns to 80 microns of the pore-forming agent, 20% of the sintering aid with a particle diameter of 10 microns to 40 microns and 30% of the conductive powder with a particle diameter of 10 nanometers to 100 nanometers. Wherein, the pore-forming agent is graphite, the sintering aid is silicon dioxide, and the conductive powder is zinc oxide.

[0061] (2) The above raw materials are mixed with water and ball milled, wherein, during ball milling, the mass ratio of raw materials, grinding media and water is 1:2:0.7, the rotating speed is 50 rpm, and the ball milling time is 20 hours to obtain slurry; Dry at 78° C. for 21 hours to obtain a mixture.

[0062] (3...

Embodiment 2

[0068] The preparation process of the ceramic sheet of the present embodiment is as follows:

[0069] (1) Weighing the raw material, the raw material is composed of the following components according to mass percentage: 50% of the particle size is 40 microns to 200 microns of alumina powder, 40% of the particle size is 10 microns to 80 microns of the pore-forming agent, 5% of the sintering aid with a particle size of 10-40 microns and 5% of the conductive powder with a particle size of 10-100 nm. Among them, the pore forming agent is starch; the sintering aid is magnesium oxide; the conductive powder is titanium oxide.

[0070] (2) The above raw materials are mixed with water and ball milled, wherein, during ball milling, the mass ratio of raw materials, grinding media and water is 1:1.5:0.4, the rotating speed is 40 rpm, and the ball milling time is 24 hours to obtain slurry; Dry at 70° C. for 24 hours to obtain a mixture.

[0071] (3) Ball mill the mixture for 3 hours at a...

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Abstract

The invention relates to porous alumina ceramics, as well as a preparation method and application thereof. The preparation method for the porous alumina ceramics comprises the following steps: weighing raw materials, wherein the raw materials comprise the following components in percentage by mass: 40 to 90 percent of alumina powder with a granularity of 40 to 200 microns, 1 to 40 percent of a pore-forming material with a granularity of 10 to 80 microns, 2 to 20 percent of a sintering aid and 3 to 30 percent of conductive powder; adding a mixture of the raw materials into a die, and vibrating the die until the height of the mixture in the die is kept unchanged; adding an adhesive into the die to enable the adhesive to permeate the mixture, drying the mixture and the adhesive, and sintering an obtained green body to obtain the porous alumina ceramics. The porous alumina ceramics has relatively high porosity and air permeability, relatively strong strength and a relatively good antistatic function.

Description

technical field [0001] The invention relates to the field of ceramic materials, in particular to a porous alumina ceramic and its preparation method and application. Background technique [0002] Due to the characteristics of high porosity, small bulk density, large specific surface area, good air permeability, and uniform adsorption force, porous ceramics are widely used in gas or liquid filtration, purification and separation, automobile exhaust catalyst carriers, sound-absorbing materials, and sensitive components. , biological materials, semiconductor industry, screen printing, electrode corrosion protection and other fields. At present, the common materials of porous ceramics are: alumina, quartz, cordierite, silicon carbide, diatomaceous earth, zirconia, etc. Among them, porous alumina ceramics have good chemical stability and strong corrosion resistance. , high temperature oxidation resistance, high strength, good wear resistance, good dimensional stability and other...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/06C04B35/10C04B35/622C04B35/64B01D39/20B01D39/06
CPCB01D39/06B01D39/2068C04B35/10C04B35/622C04B35/64C04B38/0645C04B38/0675C04B38/068C04B2235/3206C04B2235/3208C04B2235/3232C04B2235/3293C04B2235/3294C04B2235/3418C04B2235/425C04B2235/5436
Inventor 黎海华向其军谭毅成
Owner SHENZHEN SUNTECH ADVANCED CERAMICS