Synthesis of AlN Powder from Al2(SO4)3.18H2O: I. Precipitation Method

,; ,; ,; ,

J. Korean Ceram. Soc. > Volume 28(6); 1991 > Article

Journal of the Korean Ceramic Society 1991;28(6): 465.

Al2(SO4)3.18H2O로부터 AlN 분말의 합성: I. 침전법

이홍림, 송태호

연세대학교 요업공학과

Synthesis of AlN Powder from Al2(SO4)3.18H2O: I. Precipitation Method

ABSTRACT

AlN powder was synthesized by carbothermal reduction and nitridation of aluminum hydroxides precipitated in 5∼11 pH range from Al2(SO4)3$.$18H2O aqueous solution. Nitridation reactivity of hydroxide, which depends on precipitation pH, reaction temperature and time, was examined by XRD analysis at 1200∼1350$^{circ}C$ and compared with that of commercial ${alpha}$-Al2O3. Hydroxides obtained at higher pH could be more easily nitridated and, considering DTA/TG and BET results, the reason seems to be specific surface area difference of reactants depending on the content of decomposed structural water and the transition rate from transition-Al2O3 to ${alpha}$-Al2O3.