碳酸铝铵热分解制备纳米氧化铝粉体

Nanosized alumina powders were prepared from Al(NO3)3·9H2O and (NH4)2CO3 through the synthesis of ammonium aluminium carbonate hydroxide (AACH) and followed by calcination. TG DTA, XRD, TEM and BET were employed to study the process of AACH thermal decomposition and to characterize the products obtained. The results show that high purity (99.97%) and nanosized spherical α Al2O3 powders with the diameter of 40～50nm and BET surface area 32.5m2·g-1 can be obtained by calcining AACH at 1150℃for 1.5h, the sequence of phase transformation during calcination was AACH →amorphous Al2O3 →γ Al2O3 →α Al2O3, and the activation energy of AACH decomposition is (115±5)kJ·mol-1.