界面反应对铝熔体定向渗透氮化过程影响

he effect of interface reactions between melt and filler materials on the infiltration and nitridation of aluminum melt was investigated using fused magnesia, alumina spinel and corundum as particle filler materials, during the process of the fabrication of AlN matrix composite via directed metal nitridation,. The results show that, treated at 1200℃, magnesia increasingly reactes with molten aluminum and releases a mass of magnesium, which promotes the infiltration and nitridation of aluminum melt. Although the interface reaction between spinel and aluminum melt was obviously weaker, the infiltration and nitridation of aluminum are still benefited in a certain extent by the tiny magnesium from the interface reaction. Contrarily, the interface reaction between corundum and aluminum melt consumes magnesium, which retardes the infiltration. Nevertheless, the aluminum melt infiltrated has been fully nitridated and the AlN/Al2O3 composite becomes relative dense.