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
CN102180675AInactive Publication Date: 2011-09-14SHANGHAI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI UNIV
Publication Date
2011-09-14
Estimated Expiration
Not applicable · inactive patent

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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.
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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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