研究了NH4Cl/KCl添加剂对铝粉氮化反应的影响.运用TG/DSC考察了Al粉、Al+NH4Cl和Al+NH4Cl/KCl等前驱体粉末的氮化过程.运用XRD、SEM、XRF对氮化产物进行了表征.研究结果表明:NH4Cl能降低氮化温度,避免铝粉发生熔化和结块,保证得到纳米尺度的AlN颗粒;KCl的蒸发则可以破坏铝粉表面的氮化膜,促进铝粉的完全氮化,且只有两种同时作为添加剂使用,才能实现铝粉的完全氮化.用氨气做为反应气体可以消除因添加剂引入水分杂质的影响.NH4Cl/KCl还是一种低残留的添加剂,可以用来制备高纯度的AIN.
The effect of NH4Cl/KCl as the additives on the nitridation of aluminium powders was investigated.
Pure nanosized AlN powders were obtained after nitriding Al powders at 1000℃ for 5h when NH4Cl/KCl was used as the additives.
TG/DSC analysis was used to record the nitridation process of aluminium powders when different additives such as NH_4Cl, KCl and NH4Cl/KCl
were used. The resulting powders under different experiment conditions were characterized by XRD, SEM and XRF. The results show that NH4Cl
can lower the nitridation temperature and prevent the melting and coalescence of reactant Al particles, thus nanosized AlN particles will be
obtained. Apertures generated by the evaporation of KCl avoid the formation of a dense nitride layer on Al particles and enable the diffusion of NH3
to complete the nitridation of Al. NH3 as the reactant gas can eliminate the effect of moisture impurity introduced by additives. NH4Cl/KCl is
a good additive with low residue and for the production of high purity AlN.
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