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Preparation process of novel transparent ceramic with high light transmittance

A technology of transparent ceramics and preparation technology, which is applied in the field of ceramic preparation, can solve the problems that micropores cannot be eliminated, restrict the development and production application of transparent ceramics, and the transparency of ceramics cannot be significantly improved, so as to promote material migration and grain boundary movement, reduce Generation of impurities and pores, effects of improving transparency and strength properties

Inactive Publication Date: 2020-07-17
李多芹
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the existing transparent ceramic preparation process can achieve extremely low impurities that do not affect the transmittance, but there are still defects in the elimination of pores. There are often many micropores in the finished ceramic products that cannot be eliminated during the sintering process, resulting in ceramics. The transparency cannot be significantly improved, which restricts the further development and production application of transparent ceramics

Method used

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  • Preparation process of novel transparent ceramic with high light transmittance
  • Preparation process of novel transparent ceramic with high light transmittance
  • Preparation process of novel transparent ceramic with high light transmittance

Examples

Experimental program
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Effect test

Embodiment 1

[0041] see Figure 1-2 , a high-transmittance novel transparent ceramic preparation process, comprising the following steps:

[0042] S1. Take the nano-alumina powder, additives and deionized water and mix them evenly, put them into the ball mill for 4 hours, during which defoamer and binder are put in, and the water-based mixed slurry is obtained after the ball milling;

[0043] S2. The water-based mixed slurry is placed in an alumina crucible and placed in an oven, dried at a temperature of 80°C, taken out, crushed and sieved to separate large-grain block powder;

[0044] S3. Take the sieved powder for granulation and tabletting, apply cold isostatic pressing above 200MPa to form a green body, and degrease the green body;

[0045] S4. Put the green body into an atmosphere sintering furnace with a double-extending hole elimination device, and sinter at 1800°C in a hydrogen atmosphere. After cooling for 2 hours, the sintering temperature is controlled at a heating rate of 6°C...

Embodiment 2

[0055] see Figure 1-2 , a high-transmittance novel transparent ceramic preparation process, comprising the following steps:

[0056] S1. Take the nano-alumina powder, additives and deionized water and mix them evenly, put them into the ball mill for 8 hours, during which defoamer and binder are put in, and the water-based mixed slurry is obtained after the ball milling;

[0057] S2. The water-based mixed slurry is placed in an alumina crucible and placed in an oven, dried at a temperature of 100°C, taken out, pulverized, and sieved to separate large particle block powder;

[0058] S3. Take the sieved powder for granulation and tabletting, apply cold isostatic pressing above 200MPa to form a green body, and degrease the green body;

[0059] S4. Put the green body into an atmosphere sintering furnace with a double-extended hole elimination device, and sinter at 1900°C in a hydrogen atmosphere. After cooling for 12 hours, the sintering temperature is controlled at a heating rat...

Embodiment 3

[0065] see Figure 1-2 , a high-transmittance novel transparent ceramic preparation process, comprising the following steps:

[0066] S1. Take the nano-alumina powder, additives and deionized water and mix them evenly, put them into the ball mill for 12 hours, during which defoamer and binder are put in, and the water-based mixed slurry is obtained after the ball milling;

[0067] S2. The water-based mixed slurry is placed in an alumina crucible and placed in an oven, dried at a temperature of 120° C., taken out, crushed and sieved to separate large-grain block powder;

[0068] S3. Take the sieved powder for granulation and tabletting, apply cold isostatic pressing above 200MPa to form a green body, and degrease the green body;

[0069] S4. Put the green body into an atmosphere sintering furnace with a double-extended hole elimination device, sinter at 2000°C in a hydrogen atmosphere, and cool after 24 hours. The sintering temperature is controlled at a heating rate of 8°C / mi...

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Abstract

The invention discloses a preparation process of novel transparent ceramic with high light transmittance, and belongs to the technical field of ceramic preparation; nano aluminum oxide powder can be adopted; the purity and the fineness of the ceramic are improved; particle distribution is quite uniform, a double-extension hole eliminating device is innovatively introduced in the green body sintering process; a hydrogen atmosphere mixed with nano aluminum oxide powder is introduced; the characteristics of small hydrogen atom radius and high diffusion rate are utilized; pores in the green body can be quickly discharged through the entrained nanometer aluminum oxide powder; meanwhile, gas extrusion can be accelerated and filling and repairing can be carried out by utilizing the nano aluminumoxide powder which is temporarily soaked with a binding agent, and the crystal density of ceramic sintering is improved; and the double-extension pore eliminating device is arranged on the airflow impact near the surface of the green body, so that on one hand, pore elimination can be accelerated, on the other hand, the stress structure of the green body can be improved by utilizing the micro-impact effect, and substance migration and grain boundary movement are promoted, so that the transparency and the strength performance of the ceramic are remarkably improved.

Description

technical field [0001] The invention relates to the technical field of ceramic preparation, and more specifically relates to a preparation process of a novel transparent ceramic with high light transmission. Background technique [0002] Transparent ceramics refer to polycrystalline materials with certain light transmittance prepared by ceramic technology. Transparent ceramics not only have the inherent high strength, high hardness, high temperature resistance, corrosion resistance, excellent chemical stability and other properties of ceramics, but also have the optical properties of glass and excellent dielectric properties, low electrical conductivity, high thermal conductivity, etc. The unparalleled performance of other materials, so it can be widely used in high-tech fields such as lighting technology, laser technology, special instrument manufacturing, high temperature technology, wireless electronics, information detection technology and military industry. Transparent ...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622C04B35/638
CPCC04B35/10C04B35/622C04B35/638C04B2235/3206C04B2235/3232C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/9646
Inventor 不公告发明人
Owner 李多芹
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