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Preparation method of high-purity and high-density aluminum oxide bars

A high-purity alumina and high-density technology, applied in the field of sapphire crystal growth raw material preparation, can solve the problems of inconvenient, complicated preparation process, and low processing volume, and achieve the effects of convenient filling, high product purity, and large processing volume

Inactive Publication Date: 2018-10-30
RUGAO HUAYANG ALUMINUM PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the high-purity alumina raw materials used in sapphire crystal growth in the domestic market are mainly divided into granular materials, cake materials, polycrystalline materials, etc., among which cake materials are used more. In terms of purity and density, cake materials It has been done well, but its preparation process needs to be molded many times, and only a small piece can be pressed each time. The preparation process is complicated and the processing amount is low. It is inconvenient to load it one by one when filling it into the sapphire crystal growth furnace.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 5kg of high-purity alumina powder with a purity of 99.995%, and use a 2000-mesh rotary vibrating sieve to obtain uniform high-purity alumina; then gradually add high-purity alumina to a cylindrical rubber with a diameter of 60mm and a height of 400mm In the mold, add while vibrating, and vibrate; then completely seal the rubber mold with a mechanical seal; then put the sealed rubber mold into the working chamber of the cold isostatic press, pressurize to 300MPa, and hold the pressure for 40s ;Take out the rubber mold, wipe off the water on the outer wall of the mold, open the mold port, and take out the biscuit; put the biscuit naked on the corundum lining board of the high-temperature sintering furnace, sinter at 1600°C for 4 hours, cool down and take it out to get the diameter It is a high-purity high-density alumina rod with a height of 50mm, a height of 350mm, and a density of 3.8g / cm3.

Embodiment 2

[0028] Weigh 7kg of high-purity alumina powder with a purity of 99.998%, and use a 2000-mesh rotary vibrating sieve to obtain uniform high-purity alumina; then gradually add high-purity alumina to a cylindrical rubber with a diameter of 60mm and a height of 500mm In the mold, add while vibrating, and vibrate; then completely seal the rubber mold with a mechanical seal; then put the sealed rubber mold into the working chamber of the cold isostatic press, pressurize to 280MPa, and keep the pressure for 60s ;Take out the rubber mold, wipe off the water on the outer wall of the mold, open the mold port, and take out the biscuit; put the biscuit naked on the corundum lining board of the high-temperature sintering furnace, sinter at 1650°C for 4 hours, cool down and take it out to get the diameter It is a high-purity high-density alumina rod with a height of 50mm, a height of 450mm, and a density of 3.76g / cm3.

Embodiment 3

[0030] Weigh 6kg of high-purity alumina powder with a purity of 99.996%, and use a 2000-mesh rotary vibrating sieve to obtain uniform high-purity alumina; then gradually add high-purity alumina to a cylindrical rubber with a diameter of 50mm and a height of 200mm In the mold, add while vibrating, and vibrate; then completely seal the rubber mold with a mechanical seal; then put the sealed rubber mold into the working chamber of the cold isostatic press, pressurize to 300MPa, and hold the pressure for 30s ;Take out the rubber mold, wipe off the water on the outer wall of the mold, open the mold port, and take out the biscuit; put the biscuit naked on the corundum lining board of the high-temperature sintering furnace, sinter at 1550°C for 5 hours, cool down and take it out to get the diameter It is a high-purity high-density alumina rod with a height of 46mm, a height of 185mm, and a density of 3.84g / cm3.

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Abstract

The invention belongs to the technical field of sapphire crystal growth materials, and particularly relates to a preparation method of high-purity and high-density aluminum oxide bars. The preparationmethod includes the steps: taking aluminum oxide powder with high purity larger than or equal to 99.995% as a raw material; sieving the high-purity aluminum oxide powder to remove large particles; adding the uniform high-purity aluminum oxide powder into a specially-made cylindrical rubber mold in a spin-vibrating manner; performing vacuum pumping and sealing on the rubber mold; performing coldisostatic pressing forming and sintering to prepare the high-purity and high-density aluminum oxide bars. The method is simple to operate and high in production capacity and product purity, and the prepared product is particularly applicable to sapphire crystal growth.

Description

technical field [0001] The invention belongs to the technical field of preparation of sapphire crystal growth raw materials, and in particular relates to a method for preparing high-purity and high-density alumina rods. Background technique [0002] Sapphire is a single crystal of alumina. It has the advantages of high temperature resistance, corrosion resistance, high hardness, and good light transmission. It is widely used in high-tech fields such as electronic display screens, LED substrates, fairings, and window materials. In recent years, with the promotion and popularization of LED lighting around the world, the demand for sapphire crystal materials is strong, which directly drives the demand for high-purity alumina to increase significantly. At present, the high-purity alumina raw materials used in sapphire crystal growth in the domestic market are mainly divided into granular materials, cake materials, polycrystalline materials, etc., among which cake materials are u...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622
CPCC04B35/10C04B35/622C04B2235/77C04B2235/94
Inventor 黄爱华
Owner RUGAO HUAYANG ALUMINUM PROD