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Ultrafine high-purity AlON powder and preparation method thereof

A powder, high-fine technology, applied in the field of ultra-fine high-purity AlON powder and its preparation, can solve the problems of high temperature of AlON powder, large powder particle size, unfavorable pore exclusion, etc., to achieve a simple and controllable preparation process, Actionable, small-grained effects

Active Publication Date: 2018-07-27
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the prepared AlON powder tends to agglomerate, and the particle size of the powder is large, which will lead to large pores between the particles under a certain molding density, and the diffusion of the holes during sintering is not easy to carry out, which is not conducive to the elimination of pores. , the transparency of the prepared ceramics is not ideal
Moreover, the traditional method of preparing AlON powder has a high temperature, which is not conducive to the control of the cost of AlON transparent ceramics.

Method used

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  • Ultrafine high-purity AlON powder and preparation method thereof
  • Ultrafine high-purity AlON powder and preparation method thereof
  • Ultrafine high-purity AlON powder and preparation method thereof

Examples

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Effect test

Embodiment 1

[0024] Mix alumina powder, carbon powder and absolute ethanol according to a certain mass ratio, wherein the content of carbon powder in the mixed slurry is controlled at 5.4wt%, Al 2 o 3 The mass ratio of powder to absolute ethanol is 1:20, magnetic stirring and ultrasonic dispersion are carried out at room temperature for 20 minutes to obtain a mixed slurry; then the mixed slurry is put into a polytetrafluoroethylene tank for planetary ball milling for 12 hours, and the ball milling medium Alumina balls; put the ball-milled slurry into a vacuum drying oven and dry at 80°C for 2 hours to obtain a mixed powder; then pass through a 200-mesh sieve after grinding for later use; weigh a certain amount of mixed powder, and put it in a flowing nitrogen atmosphere high temperature treatment. The sintering process is atmosphere pressure sintering: it is completed in two steps. First, the obtained mixed powder was heated up to 1450°C at 10°C / min and kept for 2 hours under the protect...

Embodiment 2

[0026] Mix alumina powder, carbon powder and absolute ethanol according to a certain mass ratio, wherein the content of carbon powder in the mixed slurry is controlled at 6wt%, Al 2 o 3 The mass ratio of powder to absolute ethanol is 1:20, magnetic stirring and ultrasonic dispersion are carried out at room temperature for 20 minutes to obtain a mixed slurry; then the mixed slurry is put into a polytetrafluoroethylene tank for planetary ball milling for 12 hours, and the ball milling medium Alumina balls; put the ball-milled slurry into a vacuum drying oven and dry at 80°C for 2 hours to obtain a mixed powder; then pass through a 200-mesh sieve after grinding for later use; weigh a certain amount of mixed powder, and put it in a flowing nitrogen atmosphere high temperature treatment. The sintering process is atmosphere pressure sintering: it is completed in two steps. First, the obtained mixed powder is heated up to 1450°C at 10°C / min under the protection of flowing high-puri...

Embodiment 3

[0028] Mix alumina powder, carbon powder and absolute ethanol according to a certain mass ratio, wherein the content of carbon powder in the mixed slurry is controlled at 6.5wt%, Al 2 o 3 The mass ratio of powder to absolute ethanol is 1:20, magnetic stirring and ultrasonic dispersion are carried out at room temperature for 20 minutes to obtain a mixed slurry; then the mixed slurry is put into a polytetrafluoroethylene tank for planetary ball milling for 12 hours, and the ball milling medium Alumina balls; put the ball-milled slurry into a vacuum drying oven and dry at 80°C for 2 hours to obtain a mixed powder; then pass through a 200-mesh sieve after grinding for later use; weigh a certain amount of mixed powder, and put it in a flowing nitrogen atmosphere high temperature treatment. The sintering process is atmosphere pressure sintering: it is completed in two steps. Firstly, the obtained mixed powder was heated up to 1550°C at 10°C / min under the protective condition of fl...

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Abstract

The invention relates to ultrafine high-purity AlON powder and a preparation method thereof, and belongs to the field of preparation of transparent ceramic powder. The method is realized by the following steps: firstly preparing mixed powder of Al2O3 and carbon powder; and placing the mixed powder into a BN crucible, and preparing the ultrafine high-purity AlON powder by adopting gas pressure sintering. The method provided by the invention adopts the traditional aluminum oxide and carbon powder as raw materials, and prepares the AlON powder under relatively-low-temperature conditions; the preparation process is simple and controllable, and the operability is strong; and the AlON powder prepared by the method has higher purity and a smaller particle size.

Description

technical field [0001] The invention relates to an ultrafine high-purity AlON powder and a preparation method thereof, belonging to the field of transparent ceramic powder preparation. Background technique [0002] The infrared window is an important part of the structure-function integration and plays an important role in the missile optoelectronic system, but with the continuous development of science and technology, higher requirements are put forward for its performance. At present, the three most promising infrared window materials are generally recognized as sapphire, polycrystalline magnesium aluminum spinel, and polycrystalline aluminum oxynitride (AlON). They have their own advantages and disadvantages, but in terms of comprehensive performance, AlON transparent ceramics It is the most competitive infrared window material. [0003] Transparent aluminum oxynitride (γ-AlON) is A1 2 o 3 -A single-phase, stable solid solution transparent ceramic in the AlN binary sys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/581C04B35/622C04B35/626C04B35/645
CPCC04B35/581C04B35/622C04B35/626C04B35/62615C04B35/6263C04B35/6264C04B35/62655C04B35/645C04B2235/3217C04B2235/422C04B2235/5454C04B2235/6586C04B2235/661C04B2235/96
Inventor 李庆刚王志史国普黄世峰程新
Owner UNIV OF JINAN
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