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Preparation method of high-density, high-hardness and submillimeter-level aluminum oxide ceramic ball

A sub-millimeter technology for alumina ceramics, applied in the field of oxide structure ceramics, can solve the problems of low production efficiency and achieve the effects of low cost, short preparation cycle and good sphericity

Pending Publication Date: 2021-01-01
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water content of the slurry required for injection is 17-25%, so the preparation process includes the mud refining process, and the injection of ceramic balls needs to be completed one by one, and the production efficiency is low

Method used

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  • Preparation method of high-density, high-hardness and submillimeter-level aluminum oxide ceramic ball
  • Preparation method of high-density, high-hardness and submillimeter-level aluminum oxide ceramic ball
  • Preparation method of high-density, high-hardness and submillimeter-level aluminum oxide ceramic ball

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Using commercially available submicron alumina powder as raw material, pour it into the sieve of a vibrating sieving machine, and spray deionized water in the powder to increase the water content of the powder to 0.5 wt%. The frequency and amplitude of the vibration of the screen are 30Hz and 3mm respectively; the vibration acceleration is 3g; the vibration time is 24h; the aperture of the screen is 70 microns; after the vibration stops, the submillimeter alumina ceramics are obtained in the lower tray of the screen the body of the ball;

[0034] The ceramic ball green body is flatly placed in an alumina crucible, and it is sintered without pressure in an air environment. The sintering temperature, holding time and heating rate were 1500°C, 120min and 10°C / min, respectively.

[0035] The sintered ceramic balls are placed in a hot isostatic pressing sintering furnace, and pressure post-treatment is carried out under an argon atmosphere. The temperature and pressure of ...

Embodiment 2

[0038] Using commercially available submicron alumina powder as raw material, it is poured into the sieve of a vibrating sieving machine, and at the same time, deionized water is sprayed in the powder to increase the water content to 0.5 wt%. The frequency and amplitude of the vibration of the screen are 25Hz and 3mm respectively; the vibration acceleration is 3g; the vibration time is 24h; the aperture of the screen is 140 microns; after the vibration stops, submillimeter alumina ceramics are obtained in the lower tray of the screen the body of the ball;

[0039] The ceramic ball green body is flatly placed in an alumina crucible, and it is sintered without pressure in an air environment. The sintering temperature, holding time and heating rate were 1500°C, 120min and 10°C / min, respectively.

[0040] The sintered ceramic balls are placed in a hot isostatic pressing sintering furnace, and pressure post-treatment is carried out under an argon atmosphere. The temperature and p...

Embodiment 3

[0043] Using commercially available submicron alumina powder as raw material, pour it into the sieve of a vibrating sieving machine, and spray deionized water in the powder to increase the water content to 0.75wt%. The frequency and amplitude of the vibration of the screen are 30Hz and 3mm respectively; the vibration acceleration is 3g; the vibration time is 24h; the aperture of the screen used is 70 microns; after the vibration stops, submillimeter alumina ceramics are obtained in the lower tray of the screen the body of the ball;

[0044] The ceramic ball green body is flatly placed in an alumina crucible, and it is sintered without pressure in an air environment. The sintering temperature, holding time and heating rate were 1600°C, 120min and 10°C / min, respectively.

[0045] The sintered ceramic balls are placed in a hot isostatic pressing sintering furnace, and pressure post-treatment is carried out under an argon atmosphere. The temperature and pressure of the isostatic...

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Abstract

The invention provides a preparation method of a high-density, high-hardness and submillimeter-scale aluminum oxide ceramic ball, which comprises the following steps: by using commercially available submicron-scale aluminum oxide powder as a raw material, spraying deionized water into the powder to regulate the moisture content in the powder; raw material powder is placed in a screen of a vibration sieving machine, the powder is sieved through the screen while high-frequency vibration is conducted on the powder, in the high-frequency vibration process, alumina green body small balls in a trayare continuously vibrated and compacted, and when the size of the alumina green body small balls is increased to the needed ball diameter, the alumina green body small balls in the tray are taken out;and carrying out pressureless sintering in a high-temperature air atmosphere, putting the sintered alumina ceramic ball into a hot isostatic pressing furnace, and carrying out high-temperature pressure post-treatment to finally obtain the high-density, high-hardness and sub-millimeter alumina ceramic ball. The alumina ceramic ball obtained by the method has the advantages of uniform ball diameter, good sphericity, high density, no obvious internal defects and the like.

Description

technical field [0001] The invention belongs to the field of oxide structure ceramics, and in particular relates to a method for preparing high-density, high-hardness submillimeter alumina ceramic balls. Background technique [0002] Alumina ceramics have the advantages of high hardness, corrosion resistance, wear resistance and low cost. The ceramic ball is a commonly used grinding medium and is used in various mineral raw materials, advanced ceramic powders, daily-use porcelain pigments, glazes Mixing, crushing, grinding and other processes of materials and coatings. Alumina ceramic balls can also be used as catalyst carriers, media for engineering shock absorption and abrasives for mechanical polishing, and are widely used in materials, chemical, mechanical and metallurgical industries. [0003] Alumina ceramic balls can be formed by extrusion molding, spray granulation molding, rolling molding and molding combined with isostatic pressing molding, and can be densified th...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/64C04B35/645
CPCC04B35/10C04B35/64C04B35/6455C04B2235/6562C04B2235/95C04B2235/77C04B2235/96
Inventor 邹冀王皓刘晶晶傅正义
Owner WUHAN UNIV OF TECH