MORPHOLOGY CHANGE OF AlN WITH RESPECT TO STARTINGMATERIALS IN SHS PROCESS

摘要

The particle size and shape effects of starting raw powders on the synthesis of aluminum nitrideby self-propagating high temperature technique under high nitrogen pressure were investigatedwith various AlN diluents and Al reactants. It was found that the structure of beds of the startingraw particles largely affected the pore channels for nitrogen gas infiltration as well as thepassages for combustion propagation before and during the reaction, resulting in the morphologyand purity changes of the synthesized products. The AlN product of purity over 98% withabout 30 microns was obtained.