Method for preparing aluminium nitride powder

An aluminum nitride and powder technology, applied in the field of low-temperature combustion synthesis, can solve the problems of difficult mixing of raw materials, poor alumina reaction activity, etc., and achieve the effect of simple process

Inactive Publication Date: 2003-08-13
苏州创基精密制造有限公司
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Problems solved by technology

This method can synthesize aluminum nitride powder with fine particle size and uniform particle size distribution by controlling the quality of alumina and carbon powder, but due to the difference in polarity and specific gravity between alumina and carbon black, it is difficult to mix the raw materials evenly; The activity is poor, and it usually takes a long time (usually more than 3h) to complete the synthesis reaction at high temperature (usually higher than 1600°C)

Method used

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Examples

Experimental program
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Embodiment Construction

[0021] Weigh 75g of aluminum nitrate and 12g of urea into a 1000ml beaker, add 100ml of water, heat slowly and keep stirring until a colorless and transparent solution is obtained. Glucose was dissolved in the above solution in an amount of C / Al atomic ratio of 16 / 2.

[0022] Put the solution prepared by the above method on a temperature-controllable electric furnace, and stir while heating at a temperature of 200 ° C. After heating to a certain stage, a series of phenomena such as bubbling, smoking, and burning can be observed in the solution. Finally, A very fluffy powder was obtained which weighed 26 g as a precursor.

[0023] 10 g of the obtained powder was placed in a graphite crucible, and then kept in a furnace at 1500° C. for 3 hours. During the heating period, a nitrogen flow rate of 4 L / h was maintained in the reaction chamber.

[0024] In the air at 600-700°C, oxidize the powder generated by the nitriding reaction for 2 hours to remove excess carbon.

[0025] X-r...

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Abstract

A process for preparing superfine aluminium nitride powder includes proportioning aluminium nitrate as Al source, urea, and water-soluble organic carbon source (glucose, cane sugar, citric acid, or soluble starch), mixing, preparing solution of mixture, thermal drying at 100-400 deg.C to obtain powder, reductive nitrifying reaction at 1200-1600 deg.C in N2 for 1-24 hr, and calcining at 600-700 deg.C for 1-7 hr.

Description

technical field [0001] The invention belongs to the technical field of low-temperature combustion synthesis, and in particular provides a method for preparing ultrafine aluminum nitride powder by a low-temperature carbothermal reduction method. Background technique [0002] The sintered body of aluminum nitride has a series of excellent characteristics such as high thermal conductivity, insulation, low thermal expansion coefficient and good chemical stability, so it can be used as a functional ceramic material (such as the substrate and package of integrated circuits) , It can also be applied as a structural material (such as components used in high temperature and / or corrosive environments). Aluminum nitride ceramics have become one of the research hotspots in the field of modern new materials. [0003] Aluminum nitride powder is the raw material for preparing aluminum nitride ceramics. The sintering and thermal conductivity of ceramic materials depend on the purity of alu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/072
Inventor 曲选辉秦明礼何新波段柏华
Owner 苏州创基精密制造有限公司
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