中文摘要：

根据纯铝锭定向氮化生长显微结构特征，构造出气液固传质模型，并建立了反应速率与各传质阻力的方程关系式。研究表明：控制铝熔体氮化速率的主要阻力来自于氮气在熔体表面的化学吸附过程。而氮化反应的不断进行，导致业已形成的AlN晶柱内部或晶柱之间的毛细管半径变小，降低了渗透速率，最终导致通过毛细管力传输到反应前沿的铝熔体消耗殆尽，反应中止。

英文摘要：

Based on the microstructure characteristics during directed melt nitridation with Al melt, a gas-liquid-solid model has been built Results show that chemical absorption of nitrogen on the surface of melt controlled the reaction rate of Al nitridation. Simultaneously, Al was transported up by the capillaries. However, the capillary radii in the AlN crystals or among AlN crystal columns decreased as nitridation continued, which prevented further penetration of Al. Eventually, Al was depleted at the reaction frontier and nitridation terminated.