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Alumina ceramic capable of resisting yellowing under ultraviolet irradiation

An alumina ceramic and anti-ultraviolet technology, which is applied in the field of alumina ceramics, can solve the problems of affecting the appearance, not being found, and being unable to use in occasions with high color requirements, etc., and achieves short production process, simple operation method, and simple process equipment Effect

Inactive Publication Date: 2019-07-23
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this usually does not directly affect its use, it affects its appearance, and it cannot be used in some occasions with relatively high color requirements.
However, so far, people have not found an effective way to solve this problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1: A 95 alumina porcelain that resists yellowing under ultraviolet radiation, which is prepared by the following method: Take 100 grams of 95 alumina powder, add 1.0 grams of anti-ultraviolet yellowing dopant, and ball mill After mixing, it is dry-pressed under a pressure of 100MPa into a sheet-like sample with a diameter of about 10mm and a height of about 4mm, and placed in a silicon-molybdenum rod electric furnace for sintering at 1600°C for 4 hours to obtain a dense 95 alumina porcelain.

[0012] Take out the burnt sample, wash and dry it, put the sample under the ultraviolet lamp (1KW iodine-gallium lamp) for irradiation, and carry out the anti-ultraviolet radiation test. The result shows that after irradiating for 10 minutes, its color basically remains constant.

Embodiment 2

[0013] Example 2: A 99 alumina porcelain that resists yellowing under ultraviolet radiation, which is prepared by the following method: Take 100 grams of 99 alumina powder, add 0.5 grams of anti-ultraviolet yellowing dopant, and ball mill After mixing, it was dry-pressed under a pressure of 100 MPa into a sheet-like sample with a diameter of about 10 mm and a height of about 4 mm, and placed in a silicon-molybdenum rod electric furnace for sintering at 1650 ° C for 4 hours to obtain a dense 99 alumina porcelain.

[0014] Take out the fired sample, wash and dry it, put the sample under the ultraviolet lamp (1KW iodine-gallium lamp) for irradiation, and carry out the anti-ultraviolet radiation test. The result shows that after irradiating for 10 minutes, its color basically remains constant.

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PUM

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Abstract

The invention aims to provide alumina ceramic capable of resisting yellowing under ultraviolet irradiation and a manufacturing method thereof. In order to achieve the purpose, the technical scheme adopted by the invention comprises the following steps: adding a small amount of anti-ultraviolet yellowing doping agent into common alumina powder; carrying out wet ball milling mixing, drying the material at a certain temperature, and grinding and sieving the material to obtain mixed powder; and carrying out dry press shaping on the powder, heating the powder in an electric furnace to a preset temperature, carrying out heat preservation for a certain time, and cooling the product to obtain the compact alumina ceramic sample capable of resisting yellowing under ultraviolet radiation. The aluminaceramic prepared by the method has an excellent anti-yellowing function under ultraviolet irradiation; and after being directly irradiated by an ultraviolet lamp for a period of time, the color is basically kept unchanged. The manufacturing method is simple and convenient, short in production flow, simple in required process equipment and suitable for large-scale production.

Description

technical field [0001] The invention relates to an anti-yellowing alumina ceramic under ultraviolet radiation, which belongs to the field of new materials. Background technique [0002] Alumina ceramics is an important material, which can be divided into 95 alumina porcelain, 99 alumina porcelain and so on according to the alumina content. Alumina ceramics have good insulation properties, good dielectric properties, high thermal conductivity, high mechanical strength, high temperature resistance, wear resistance, chemical corrosion resistance, etc., and the process is mature and low cost. It is used in machinery, electronics, chemical industry, Communications and other industries have a wide range of uses. [0003] In recent years, it has been found that some alumina ceramics often change from white to yellow in color after ultraviolet radiation, and even appear faint yellow after sunlight. Although this usually does not directly affect its use, it affects its appearance, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10
CPCC04B35/10C04B2235/3206C04B2235/3251C04B2235/9646
Inventor 李蔚宋雁翎孙小曼
Owner EAST CHINA UNIV OF SCI & TECH