Process for preparing gamma-AlON powder by chemical coprecipitation and carbothermal reduction method

A technology of chemical co-precipitation and reduction method, applied in the field of chemical co-precipitation carbothermal reduction method to prepare γ-AlON powder, can solve the problems of excessive nitriding and incomplete nitriding reaction of powder, achieve uniform particle size distribution, avoid Effects of uneven mixing of reactants

Inactive Publication Date: 2011-09-14
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Too high temperature during sintering will lead to excessive nitriding of powder, too low temperature will cause incomplete nitriding reaction

Method used

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  • Process for preparing gamma-AlON powder by chemical coprecipitation and carbothermal reduction method
  • Process for preparing gamma-AlON powder by chemical coprecipitation and carbothermal reduction method
  • Process for preparing gamma-AlON powder by chemical coprecipitation and carbothermal reduction method

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Experimental program
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Effect test

Embodiment 1

[0023] 45.455g Al(NO 3 ) 3 .H 2 O, 5.4g urea CO(NH 2 ) 2 Add 4.5g of PEG (polyethylene glycol, molecular weight 5000) into 300ml of deionized water, and stir for 30min at 80-90°C to obtain a transparent and uniform solution. 0.5g stearic acid (C 18 h 36 o 2 ), 6g ammonium bicarbonate (NH 4 HCO 3 ) and 0.384g (mass fraction: 5.9%) nano-carbon black (average particle size is about 18nm) were added to 200ml deionized water, and stirred at 150°C for 1h to obtain a stable suspension. Then slowly add the hydrolyzed solution of aluminum nitrate into the ammonium bicarbonate solution suspended with carbon black, and stir while adding. After all the addition is completed, continue to add ammonia water to adjust the pH value to 8, and continue to stir for half an hour. After that, the desired precursor precipitation can be obtained. Precursor precipitates were aged at room temperature for 24 h, filtered, washed three times with deionized water and once with absolute ethanol. ...

Embodiment 2

[0025] 45.455g Al(NO 3 ) 3 .H 2 O, 5.4g urea CO(NH 2 ) 2 Add 4.5g PEG (molecular weight 5000) into 300ml deionized water and stir for 30min at 80-90°C to obtain a transparent and uniform solution. 0.5g stearic acid (C 18 h 36 o 2 ), 6g ammonium bicarbonate (NH 4 HCO 3) and 0.384g (mass fraction: 5.9%) nano-carbon black (average particle size is about 18nm) were added to 200ml deionized water, and stirred at 150°C for 1h to obtain a stable suspension. Then slowly add the hydrolyzed solution of aluminum nitrate into the ammonium bicarbonate solution suspended with carbon black, and stir while adding. After all the drops are completed, continue to add ammonia water to adjust the pH value to 9, and continue to stir for half an hour. After that, the desired precursor precipitation can be obtained. Precursor precipitates were aged at room temperature for 24 h, filtered, washed three times with deionized water and once with absolute ethanol. The resultant was dried at 80° ...

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Abstract

The invention relates to a process for preparing gamma-AlON powder by chemical coprecipitation and a carbothermal reduction method, belonging to the synthesis and processing field of ceramic material powder. The process is characterized by comprising the following steps: carrying out precipitation reaction based on aluminium nitrate, urea and nano carbon black as raw materials, polyethylene glycol (PEG) as a dispersing agent and ammonium bicarbonate as a precipitator so as to obtain a precursor; precipitating and washing the precursor, drying and then grinding, and processing for 2-4 hours under the protective condition of nitrogen with 700 DEG C; insulating for 2-4 hours at the temperature of 1750 DGE C under the condition that the flow of nitrogen is 0.5L/min; and naturally cooling in air, then decarbonizing at the temperature of 700 DEG C so as to finally obtain the pure AlON powder with a particle size of 1-4 mu m and the grain size of the powder is uniform.

Description

technical field [0001] The invention relates to a method for preparing gamma-AlON powder by a chemical co-precipitation carbothermal reduction method, and belongs to the technical field of ceramic material powder synthesis and preparation. Background technique [0002] Spinel-type aluminum oxynitride (γ-AlON) is referred to as AlON, which is A1 2 o 3 -An important single-phase, stable solid solution ceramic material of the AlN binary system, and has become a potential new infrared material with its unique optical properties. Transparent AlON ceramics not only have good physical, mechanical and chemical properties, but also have good light transmission performance. Its light transmission range is from the ultraviolet region to the infrared region (wavelength 0.2 μm to 6.0 μm), and the highest transmittance can reach more than 80%. , At the same time, it has good optical isotropy, so transparent AlON ceramics are the preferred materials for high-temperature infrared windows,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/626
Inventor 邓莲芸施鹰林挺谢建军
Owner SHANGHAI UNIV
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