Method for preparing aluminium nitride powder

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...

AI Technical Summary

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)