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Hypergravity auxiliary non-equilibrium preparation method for aluminum oxide base transparent ceramic material

A technology based on transparent ceramics and alumina, which is applied in the field of preparation of oxide transparent ceramics. It can solve the problems of expensive material raw materials and sintering costs, high cost, and long preparation cycle, so as to promote preferred orientation, high production efficiency, and short preparation cycle. Effect

Inactive Publication Date: 2008-09-24
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main disadvantages of the above process are: the powder is easy to agglomerate, the powder is easy to be polluted during the preparation process, the particles are easy to grow abnormally during the sintering process, and the final material often contains a certain amount of pores, so it is difficult to prepare a completely dense ideal material. In addition, the preparation cycle is long, energy consumption is large, and the cost is high
Therefore, the traditional production process has greatly limited the preparation of transparent ceramics, and the raw materials and sintering costs of the material are very expensive, which limits its wide application and promotion in practice.

Method used

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  • Hypergravity auxiliary non-equilibrium preparation method for aluminum oxide base transparent ceramic material
  • Hypergravity auxiliary non-equilibrium preparation method for aluminum oxide base transparent ceramic material
  • Hypergravity auxiliary non-equilibrium preparation method for aluminum oxide base transparent ceramic material

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Get ultrafine aluminum powder (particle size is 20 microns, purity greater than 98%) by weight to be 23.9 parts, analytically pure Fe 2 o 3 Powder is 71.1 parts, analytically pure CaF 2 The powder is 5 parts, and a total of 300 grams of raw materials are weighed, with absolute ethanol as the medium, put into a clean ball mill jar, fix the ball mill jar on the planetary ball mill, adjust the speed of the planetary ball mill at 300 rpm, and the mixing time For 100 minutes, dry the mixed powder material and compact it into a green body material with a diameter of 80 mm and a relative density of 60%; put the obtained green body material into a reaction vessel, and open the supergravity combustion synthesis device to react chamber, fix the reaction vessel in the supergravity combustion synthesis device and then close the reaction chamber; start the vacuum pump of the supergravity combustion synthesis device, evacuate until the vacuum degree in the reaction chamber is 100 Pa...

Embodiment 2

[0036] Get 31.5 parts of superfine aluminum powder (particle size is 50 microns, purity greater than 98%) by weight, analytically pure CrO 3 58.5 parts of powder, 10 parts of analytically pure MgO powder, weigh 200 grams of raw materials in total, use absolute ethanol as the medium, put them into a clean ball mill jar, fix the ball mill jar on the planetary ball mill, and adjust the speed of the planetary ball mill at 300 revolutions per minute, the mixing time is 100 minutes, the mixed powder material is dried and pressed into a green body material with a diameter of 80 mm and a relative density of 60%. Put the obtained green body material into the reaction vessel, open the reaction chamber of the supergravity combustion synthesis device, fix the reaction vessel in the hypergravity combustion synthesis device and close the reaction chamber; start the vacuum pump of the supergravity combustion synthesis device, and evacuate to the reaction chamber The internal vacuum is 1000 P...

Embodiment 3

[0038] Take 13.2 parts of ultrafine aluminum powder (particle size is 80 microns, purity greater than 98%), 53.8 parts of analytical pure NiO powder, analytical pure Y 2 o 3 33.0 parts of powder, weigh 300 grams of raw materials in total, put them into a clean ball mill jar, use absolute ethanol as the medium, adjust the speed of the planetary ball mill at 300 rpm, and mix for 100 minutes, and dry the mixed raw materials After dry treatment, press it into a green body material with a diameter of 80 mm and a relative density of 55%. The obtained green body material is put into a reaction vessel, and the reaction chamber of the high-gravity combustion synthesis device is opened, and the reaction vessel is fixed on the high-gravity combustion synthesis device and then closed. Reaction chamber; start the vacuum pump of the supergravity combustion synthesis device, evacuate until the vacuum degree in the reaction chamber is 10 Pascals, close the vacuum pump of the supergravity comb...

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Abstract

The present invention belongs to the production technical field of the oxid transparent ceramics, and relates to a hyper-gravity assistant non-balancing method for producing the aluminia-base transparent ceramic material (such as the aluminum oxide, yttrium aluminium garnet, etc.), which comprises the raw materials by weight (based on the ultra-fine aluminum powder): 10 to 50 portions of ultra-fine aluminum powder, 10 to 80 portions of pure-metal-analysis oxid powder, 0 to 35 portions of pure-rare-earth-analysis oxid powder aid, 0 to 10 portions of pure-alkali-soil-analysis metal oxid powder aid, 0 to 5 portions of pure non-metal oxid powder aid and 0 to 10 portions of pure fluorid powder aid. The raw materials are put into a clean grinding machine to be adequately grinded and mixed, and then are loaded into a hyper-gravity combustion synthesis device to synthesize the aluminum-oxide-base ceramic-block material that is cut, grinded and polished to be the aluminum-oxide-base transparent ceramic material with bright and smooth surface. The density of the transparent ceramic block is about 96 percent, and the transmittance is intermediate at the range from 10 percent to 60 percent.

Description

technical field [0001] The invention belongs to the technical field of preparation of oxide transparent ceramics, and relates to alumina-based transparent ceramics such as aluminum oxide (Al 2 o 3 ), yttrium aluminum garnet (YAG), etc., particularly involving the use of high gravity-assisted non-equilibrium preparation technology for the preparation of alumina-based transparent ceramic materials. Background technique [0002] Alumina transparent ceramics have good permeability to visible light and infrared light, and have the characteristics of high temperature strength, good heat resistance, strong corrosion resistance, and high specific volume resistance. They are widely used in the fields of microelectronics, national defense, and aerospace. . [0003] The melting point of ceramic materials is much higher than that of metals, so the process route of powder making, molding and sintering has been used for a long time. High transparency Al 2 o 3 Ceramic materials mostly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622
Inventor 陈克新裴军钟继东刘光华李江涛
Owner TSINGHUA UNIV
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