Preparation of Monodispersed, Sheperical Al2O3 and Mg-doped Al2O3 Powder and Sintering Characterization of These Powders

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J. Korean Ceram. Soc. > Volume 31(1); 1994 > Article

Journal of the Korean Ceramic Society 1994;31(1): 1.

구형의 단분산 Alumina 및 Mg-doped Alumina의 합성과 소결에 관한 연구

이중윤, 부재필, 최상흘

한양대학교 무기재료공학과

Preparation of Monodispersed, Sheperical Al2O3 and Mg-doped Al2O3 Powder and Sintering Characterization of These Powders

ABSTRACT

Monodispersed alumina and Mg-doped alumina fine particles were prepared by controlled hydrolysis of alkoxides. Aluminium alkoxide and magnesium alkoxide were dissolved into complex solvent which was composed of hydrophobic n-octanol and hydrophilic acetonitrile. Hydroxypropyl cellulose(HPC) was used as a dispersant for the alumina particles. The size of these prepared powders was approximately 0.3 ${mu}{textrm}{m}$. In the case of sintering above 100$0^{circ}C$, most of these prepared powders were transformed to $alpha$-alumina. The relative density of the sintered body of these prepared powders at 1$600^{circ}C$ was 98%. The sintered body of the Mg-doped alumina powder had more uniform grain size than that of the undoped alumina podwer.