Preparation of Aluminum Nitride from an Alkoxide and its Properties

,; ,; ,; ,; ,; ,

J. Korean Ceram. Soc. > Volume 26(1); 1989 > Article

Journal of the Korean Ceramic Society 1989;26(1): 100.

알콕사이드로부터 AlN분말의 합성 및 분말 특성

이홍림, 박세민, 조덕호¹

연세대학교 공과대학 요업공학과
¹국립 공업시험원

Preparation of Aluminum Nitride from an Alkoxide and its Properties

ABSTRACT

Aluminum hydroxides were prepared by the alkoxide hydrolysis method using Al-isopropoxide as a starting material and NH4OH as a catalytic agent. When Al-isopropoxide was hydrolyzed in a H2O-NH3 system, only Al(OH)3 was obtained over all pH values. However, AlOOH was formed besides Al(OH)3 when Al-isopropoxide was hydrolyzed in a H2O-NH3-isopropyl alcohol system. The AlOOH/Al(OH)3 ratio was increased as the isopropyl alcohol content was increased. The hydroxides, Al(OH)3 and AlOOH, obtained in this study and the commerical products, $alpha$-Al2O3 and AlOOH were subjected to the carbothermal reduction and nitridation reaction to product AlN powder, using carbon black as a reducing agent under N2 atmosphere at various temperatures. AlN was synthesized from the obtained Al(OH)3 and the commercial AlOOH at 145$0^{circ}C$, however, synthesized from the obtained AlOOH and the commercial alpha-alumina at 135$0^{circ}C$. The temperature difference is assumed to be attributed to the reactivity of those powders. AlN powder prepared from the Al-isopropoxide was observed to have the narrower particle size distribution than that prepared from the commercial $alpha$-Al2O3 or AlOOH.