Synthesis of Aluminum Nitride Powder from Aluminum Hydroxide by Carbothermal Reduction-Nitridation

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J. Korean Ceram. Soc. > Volume 31(8); 1994 > Article

Journal of the Korean Ceramic Society 1994;31(8): 893.

알루미나 수화물로부터 탄소환원질화법에 의한 질화알루미늄 분말의 합성

황진명, 정원중, 최상욱

인하대학교 무기재료공학과

Synthesis of Aluminum Nitride Powder from Aluminum Hydroxide by Carbothermal Reduction-Nitridation

ABSTRACT

In this study, AlN powder of fine particle size and of high purity was synthesized by the carbothermal reduction-nitridation of monodisperse, spherical Al(OH)3 which had been prepared by sol-gel method using Al(O-sec-C4H9)3 as the starting material. Depending on the mixing order and kinds of reducing agents, the optimum condition for the preparation of AlN was determined as follows. AlN single-phase was produced by the carbothermal reduction-nitridation of (1) Benzene-washed Al(OH)3 and the reducing agent, carbon, which was mixed in a ball mill: for 5 hours at 140$0^{circ}C$ under NH3 atmosphere; (2) The mixture prepared by hydrolysis of alkoxide solution into which carbon had been dispersed beforehand: for 5 hours at 135$0^{circ}C$ ; (3) Al(OH)3 Poly(furfuryl alcohol) composite powder: for 2.5 hours at 135$0^{circ}C$; (4) The mixture of Al(OH)3 and polyacrylonitrile: for 5 hours at 140$0^{circ}C$. Addition of CaF2 increased the nitridation rate when carbon or polyacrylonitrile was used as the reducing agent; but it had no effect on the nitridation rate when furfuryl alcohol was used as the reducing agent.