EFFECT OF REACTION CONDITIONS ON THE SYNTHESIS OF ULTRAFINE A1N POWDER WITH GLUCOSE AS CARBON SOURCE

摘要

Using aluminum hydroxide (Al(OH)(3)) and aluminum nitrate (Al(NO3)(3)center dot 9H(2)O)as aluminum sources and highly active glucose (C6H12O6) as a carbon source, we synthesized ultrafine AlN powder through carbothermal reduction-nitridation. Then, we explored the effects of aluminum sources, reaction temperature, holding time and other reaction conditions on the phase composition and micromorphology of the synthesized AlN powder. Result showed that AlN powder and different proportions of Al2O3-AlN composite powder can be prepared by controlling reaction temperature or holding time. Under the conditions of this experiment, Al(OH)(3) more beneficial as an aluminum source for carbothermal reduction-nitridation than Al(NO3)(3)center dot 9H(2)O. The optimum reaction conditions for the synthesis of single-phase AlN powder with Al(OH)(3) as aluminum source were holding time of 3 h and temperature of 1450 degrees C. The powder sample synthesized under this reaction condition is mainly composed of flaky, short-rod, and irregularly shaped fine particles with sizes ranging from 50 nm to 100 nm.