High-transparency alumina ceramic preparation method

A high-transparency technology for alumina ceramics, applied in low-cost transparent ceramic preparation technology and high-temperature forging, can solve the problems of non-industrial production, reduced mechanical strength, uneven dispersion, etc., and achieves increased light transmittance and obvious light transmittance , The effect of simple process

Inactive Publication Date: 2015-04-08
YANTAI SHIELD ADVANCED MATERIALS
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Problems solved by technology

There are some difficult problems in the above methods. For example, the addition of trace elements such as magnesium oxide usually leads to uneven dispersion, and the addition of calcium oxide usually reduces its mechanical strength due to the increase of the system.
In addition, some people can also improve the light transmittance by adopting different sintering processes, among which hot isostatic pressing sintering is the most researched, but with this process, the current highest light transmittance is only about 65%, which still cannot meet the needs; In addition, by strengthening the magnetic field during grouting molding, the alumina crystals can be formed along a certain direction, and finally a high light transmittance of more than 70% can be obtained, but the magnetic field is as high as 10T. This kind of magnetic field environment is very expensive and can only be used Due to scientific experiments, it is impossible to use in industrial production under the current technological level

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The high-purity alumina powder with 0.1% by weight of magnesia was formed by 200MPa cold isostatic pressing; then the formed ceramic green body was pre-fired in an air atmosphere at 750°C for 120 minutes; the pre-fired green body was placed Sintering at 1700°C for 60 minutes in a high-temperature vacuum environment to obtain a translucent alumina ceramic body with a light transmittance of 32%; the alumina ceramic body was placed in a box furnace for post-treatment at a temperature of 1500°C, the highest Keep warm at the temperature for 2 hours; use the air hammer to forge the processed ceramic rod blank along the height direction of the slab; after forging, perform annealing treatment at 900°C for 1 hour; finally use multi-wire cutting machine, surface grinder and diamond grinding paste Cutting, grinding and polishing of ceramics.

[0022] The obtained transparent ceramic body had a relative density of 99.92% and an average grain size of 0.40 μm. The light transmit...

Embodiment 2

[0024] The high-purity alumina powder with 0.1% by weight of magnesia was formed by 200MPa cold isostatic pressing; then the formed ceramic body was pre-fired in an air atmosphere at 820°C for 150 minutes; the pre-fired body was Sintering at 1800°C for 90 minutes in a high-temperature vacuum environment to obtain a translucent ceramic body with a light transmittance of 40%; the alumina ceramic body was placed in a box furnace for post-processing at a temperature of 1600°C, and the highest temperature was Insulate for 1.5 hours; use air hammer to forge the processed ceramic rod body along the length of the slab; after forging, perform annealing treatment at 1150°C for 1.5 hours; Ceramics are cut, ground and polished.

[0025] The relative density of the obtained transparent ceramic body was 99.94%, and the average grain size was 0.60 μm. The light transmittance of transparent ceramic sheets in the visible light region (380nm~760nm) can reach 68%, while in the infrared region ...

Embodiment 3

[0028] The high-purity alumina powder with 0.2% by weight of yttrium oxide was molded by 200MPa cold isostatic pressing; then the formed ceramic green body was pre-fired in an air atmosphere at 900°C for 60 minutes; the pre-fired green body was Sintered at 1820°C for 180min in a high-temperature vacuum environment to obtain a translucent ceramic body with a light transmittance of 38%; the alumina ceramic body was placed in a box furnace for post-treatment at a temperature of 1700°C, and the highest temperature was Heat preservation for 0.5 hours; use air hammer to forge the processed ceramic rod body along the width direction of the slab; after forging, perform annealing treatment at 1250 °C for 3 hours; finally use multi-wire cutting machine, surface grinder and diamond abrasive paste to Ceramics are cut, ground and polished.

[0029] The relative density of the obtained transparent ceramic body was 99.92%, and the average grain size was 0.92 μm. The light transmittance o...

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Abstract

The invention discloses a high-transparency alumina ceramic preparation method. Semi-transparent alumina ceramic bars which are subjected to hydrogen or vacuum sintering serve as the raw material of high-transparency alumina ceramic. The high-transparency alumina ceramic is prepared through a hot forging technology, green bodies subjected to sintering are heated to 1500 DEG C to 1700 DEG C and are subjected to heat preservation for 0.5 h to 2 h, and then the green bodies are forged in the fixed direction; the green bodies are subjected to multi-line cutting and polishing, and the transparent polycrystal alumina ceramic with the linear light transmittance larger than 70% can be obtained. The high-transparency alumina ceramic preparation method is simple in process, the process is extended on the basis of a traditional preparation technology, only small investment is needed, and productivity is not limited; more importantly, light transmittance is obviously increased and can be increased from usual 30% to 40% to 65% to 70%, and even more. The high-transparency alumina ceramic preparation method has the advantages that remarkable competitive advantages and profit space are showed in the respects of manufacturing cost, product performance, large-scale production, environmental friendliness and the like.

Description

technical field [0001] The invention discloses a method for preparing high-transparency alumina ceramics, which belongs to the technical field of preparation of functional inorganic materials, and in particular relates to the preparation technology of low-cost transparent ceramics and high-temperature forging technology. Background technique [0002] Transparent alumina ceramics are also called transparent polycrystalline alumina. Compared with transparent materials such as glass, transparent ceramic materials have the characteristics of high temperature resistance, high hardness, strong impact resistance, good insulation, and high thermal conductivity, so they are used in high-voltage gas discharge tubes , high-temperature infrared detection window, high-frequency insulating materials, LED lamps and other fields have irreplaceable advantages. [0003] Since alumina crystals belong to a uniaxial crystal heterogeneous body, although a single alumina crystal is transparent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622
Inventor 邱春霞侯庆龙豆帆朱洪维刘海燕
Owner YANTAI SHIELD ADVANCED MATERIALS
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