Synthesis and Characterization of Nano-Sized AlN Powders by CRN Route from a Sol-Gel Low Temperature Combustion Precursor

Qing Hua Yang; Huan Ping Wang; Wen Juan Zhang; Shi Feng Wang; Shi Qing Xu

doi:10.4028/www.scientific.net/AMR.557-559.644

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Synthesis and Characterization of Nano-Sized AlN Powders by CRN Route from a Sol-Gel Low Temperature Combustion Precursor

Abstract:

Nano-sized aluminum nitride (AlN) powders were synthesized through a carbothermal reduction nitridation (CRN) route from a sol-gel low temperature combustion precursor. The precursor was precalcined at 600-1200 °C and then nitrided at 1400-1550 °C for different holding time to obtain AlN powders. During the whole preparation process, the amorphous alumina in the precursors first transformed to γ-Al₂O₃, then to α-Al₂O₃, and AlN was obtained through the nitridation of α-Al₂O₃ with the reduction of carbon. The results show that the appropriate precalcination benefits the activity of precursors and promotes the formation of AlN phase due to the transition of amorphous alumina to γ-Al₂O₃, and the optimum precalcination temperature is 1000 °C. The effects of different nitridation parameters on the microstructure of AlN powders were also investigated. By being nitrided at 1500-1550 °C for 2 h, the AlN powders present a good distribution and small particle size of 30-90 nm from the precursor precalcinated at 1000 °C.