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

Abstract

Using aluminum hydroxide (Al(OH)₃) and aluminum nitrate (Al(NO₃)₃.9H₂O) 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)₃.9H₂O. 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 °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.

Keywords

• Carbothermal reduction-nitridation
• AlN powder
• Glucose
• Reaction conditions
• Synthesis