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Method for batch preparation of pure phase AlON transparent ceramic powder body

A transparent ceramic and pure-phase technology, applied in the field of batch preparation of pure-phase AlON transparent ceramic powder, can solve the problems of unexplained performance of transparent ceramics, oxidation of AlON powder, unfavorable industrial production, etc. Activated carbon, good reactivity effect

Active Publication Date: 2012-12-26
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent 201010190470.0 reports a preparation method of ultrafine, high-purity γ-AlON transparent ceramic powder, which uses Al 2 o 3 The AlON transparent ceramic powder is prepared by using nano-grade carbon black or nano-bamboo carbon powder as raw materials at 1700-1800°C for 2-6 hours. Due to the high sintering temperature and long holding time, the powder is easily over-nitrided to form AlN. And its decarbonization temperature is high, the time is long, it is easy to oxidize AlON powder, the performance of transparent ceramics prepared by using this powder has not been explained
[0006] In addition to the above-mentioned method for preparing AlON powder by carbothermal reduction, Chinese patent 201110041724.7 reported a method for preparing γ-AlON powder by chemical co-precipitation carbothermal reduction, and another domestic invention patent 200910061558.X also reported a method based on The method of preparing AlON ceramic powder by carbothermal reduction method requires that the heating rate is too fast, which is not conducive to industrial production due to the limitation of equipment.

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  • Method for batch preparation of pure phase AlON transparent ceramic powder body
  • Method for batch preparation of pure phase AlON transparent ceramic powder body
  • Method for batch preparation of pure phase AlON transparent ceramic powder body

Examples

Experimental program
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Effect test

Embodiment 1

[0061] ① Mixing: Al with an average particle size of 80nm 2 o 3 The mixed powder of analytically pure activated carbon particles is mixed with silicon nitride as the ball milling medium and dehydrated alcohol as the dispersion medium at a speed of 170r / min for 12h, wherein the activated carbon accounts for 5.6wt.% of the total mass of raw materials, and the quality of dehydrated alcohol is 4 times the quality of the raw material, the specific surface area is 253m 2 / g of mixed powder slurry.

[0062] ②Drying: Dry the slurry obtained in step ① on an electric heating plate at 140°C for 1.2h in the air, and pass through a 50-mesh sieve to obtain Al 2 o 3 Mix powder with activated carbon;

[0063] ③Fabrication: Put the mixed powder in a graphite crucible with a radius of 85mm, the powder filling height is 43mm, and the air holes with a diameter of 1.5mm and a spacing of 10mm are preset in the powder;

[0064] ④Pre-vacuumize the sintering furnace: place the graphite crucible i...

Embodiment 2

[0069] Other steps are identical with embodiment 1, difference is:

[0070] Step 1. Mixing: Al with an average particle size of 80nm 2 o 3 The mixed powder of analytically pure activated carbon particles was mixed with silicon nitride as the ball milling medium and dehydrated alcohol as the dispersion medium at a speed of 170r / min for 2h, wherein the activated carbon accounted for 5.6wt.% of the total mass of raw materials, and the quality of dehydrated alcohol was 4 times the quality of the raw material, the specific surface area is 195m 2 / g of mixed powder slurry.

[0071] ②Drying: Dry the slurry obtained in step ① on an electric heating plate at 140°C for 1.2h in the air, and pass through a 50-mesh sieve to obtain Al 2 o 3 Mix powder with activated carbon;

[0072] ③Fabrication: Put the mixed powder in a graphite crucible with a radius of 120mm, the powder filling height is 43mm, and the above-mentioned 195m 2 The mixed powder of / g is placed in the region with a rad...

Embodiment 3

[0075] Other steps are identical with embodiment 1, difference is:

[0076] Step 1. Mixing: Al with an average particle size of 80nm 2 o 3 The mixed powder of analytically pure activated carbon particles was mixed with silicon nitride as the ball milling medium and dehydrated alcohol as the dispersion medium at a speed of 160r / min for 24h, wherein the activated carbon accounted for 5.6wt.% of the total mass of raw materials, and the quality of dehydrated alcohol was 4 times the quality of the raw material, the specific surface area is 177m 2 / g of mixed powder slurry.

[0077] ③Fabrication: Put the mixed powder in a graphite crucible with a radius of 150mm, the powder filling height is 43mm, and the above-mentioned 177m 2 The mixed powder of / g is distributed in the area that the radius is greater than 120mm, and embodiment 2 steps 2. gained 195m 2 The mixed powder of / g is arranged in the area of ​​radius 852 / g of mixed powder is placed in an area with a radius of less t...

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Abstract

The invention relates to a method for batch preparation of a pure phase AlON transparent ceramic powder body, belonging to the technical field of preparation of the transparent ceramic powder body. The method comprises the steps as follows: taking nanometer Al2O3 and active carbon as raw materials; mixing the raw materials on a planetary ball mill at a low rotation speed; quickly drying slurry onan electric heating plate; loading powder by a region distribution and preset air hole technology; and preparing the pure phase AlON transparent ceramic powder body in combination with a low-temperature quick carbon removal process. Different region phases of the obtained AlON powder body are stable in composition and good in uniformity, so that the AlON powder body is suitable for batch production; and an AlON transparent ceramic with high transmittance rate can be obtained by taking the AlON powder body as a raw material and sintering the AlON powder body in a shorter time at a lower temperature, which shows that the AlON powder body prepared by the method is good in sintering activity and is suitable for preparing the AlON transparent ceramic.

Description

technical field [0001] The invention relates to a method for preparing pure-phase AlON transparent ceramic powder in batches, and belongs to the technical field of transparent ceramic powder preparation. Background technique [0002] Aluminum oxynitride (AlON) as AlN-Al 2 o 3 A stable single-phase solid solution in the phase diagram of the binary system, with an isotropic cubic structure, can be made into AlON transparent ceramics through high-temperature sintering. AlON has good transmittance in a wide band (ultraviolet-visible-infrared), and has excellent physical and chemical properties. At the same time, AlON also has the advantages of polycrystalline ceramics in material preparation, so it is a preferred optical window material. Both military and civilian fields have broad application prospects. [0003] The phase composition, particle size and morphology of the synthesized AlON powder have an important impact on the subsequent molding, sintering and product performa...

Claims

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Application Information

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IPC IPC(8): C04B35/626C04B35/58
Inventor 单英春徐久军
Owner DALIAN MARITIME UNIVERSITY
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