Abstract
The particular characteristics of aluminum nitride and silicon nitride powders obtained by SHS technology are reported. The synthesized powders showed high particle sizes that are not suitable for sintering. Consequently, the powders were subjected to an energetic milling process using an attritor with different milling media and times. Silicon nitride powders were milled with Si 3N 4 balls while for aluminum nitride powders different media (Si 3N 4, Al 2O 3, ZrO 2) were used. Particle size and specific surface area were determined in both powders as a function of the milling variables. The increase in the level of impurities associated with the milling procedure was measured. The morphology of each powder was analyzed before and after milling by scanning electron microscopy. The results were evaluated by comparing with characteristics of typical commercial powders of AlN and Si 3N 4, to establish the differences with the SHS powders. ©
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