Al-BN 固液反応における AlN 生成過程に及ぼす B の効果

Abstract

The AlN/Al base composite has been made through a solid-liquid reaction between molten Al and BN powder under either the atmosphere of N2 or Ar. However, the volume fraction of AlN in the composite is larger in the former case than in the latter case, when both compared under the same forming condition besides the difference in the atmosphere. This fact suggests that extra AlN may be formed under the N2 atmospheric condition through the direct reaction between Al and N, and brings forth the idea that the reactant B in molten Al may play some promoting role on the formation of AlN. To verify this hypothesis, such experiments as B containing Al base alloy is heated under various pressures of N2 have been performed. These experiments have shown some interesting results concerning the morphology of AlN particles formed, and have suggested a “promoting effect of B for the AlN formation”.