Synthesis of NiO-doped Al2O3 Powder by Spray Pyrolysis

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J. Korean Ceram. Soc. > Volume 28(8); 1991 > Article

Journal of the Korean Ceramic Society 1991;28(8): 593.

분무열분해법에 의한 NiO 첨가 Al2O3 분체의 합성

박정현, 조경식, 김한태

연세대학교 공과대학 요업공학과

Synthesis of NiO-doped Al2O3 Powder by Spray Pyrolysis

ABSTRACT

Al2O3 and NiO-doped Al2O3 powders were prepared from the ethanol solution of Al (NO3)3$.$9H2O and Ni(NO3)2$.$6H2O by spray pylolysis method using two-fluid nozzle. As a result of spraying test with 0.3 mol/{{{{ iota }} concentration starting solution, mean droplet sizes varied with 8.99∼9.69$mutextrm{m}$ and those standard deviation were 4.57∼5.12. As-prepared powders which were synthesized at 1000$^{circ}C$ have spherical shape, sizes of 0.1∼3.0$mutextrm{m}$ and specific surface area of 22.34∼24.20㎡/g. Most powders consisted of {{{{ gamma }}-Al2O3 phase and transforned into ${alpha}$-A;2O3 phase by calcination at 1100$^{circ}C$ for 1 hr. NiO-doped Al2O3 sintered bodies had better sinterability than those of pure Al2O3 and 0.3 wt% NiO-doped Al2O3 had near theoretical density and dense microstructure.