Investigation of the Granulometric Composition and Structure of AlN and SI_3N_4 Powders After Hydrogen-Thermal Treatment

摘要

A principle new approach to the non-metal nitride powders activation is proposed in this paper. This approach consists in hydrogen-thermal treatment (HTT) of precursor non-metal nitrides powders at 500-1,150℃ in presence of hydrogen and catalysts. The goal of hydrogen-thermal treatment of powders is to extract the irrelevant impurities, to grind the powder particles and to improve the powder structure. Evolution of AlN and Si_3N_4 powders structure in HTT at different temperatures (500-1,150℃) has been studied. HTT of non-metal nitrides powders was shown to favour the removal of sorbed impurities from the particle surface and to decrease in starting temperature of powder sintering.