Synthesis of alumina powders by the glycine-nitrate combustion process

摘要

The combustion synthesis technique using glycine as fuel and aluminum nitrate as an oxidizer is able to produce alumina powders.Thermodynamic modeling of the combustion reaction shows that as the fuel-to-oxidant ratio increases,the amount of gases produced and adiabatic flame temperatures also increases.X-ray diffractions showed the amorphous structure for as-synthesized powder and presence of well-crystallized alpha-Al_2O_3 after calcination at 1100degC during soaking time of 1 h.Alumina's largest measured specific surface area was 15 m~2/g with BET method and 0.51 glycine-to-nitrate ratio.