A Study on the Preparation of MgO-Al2O3-SiO2 System Ceramic Powders by Spray Pyrolysis Method

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J. Korean Ceram. Soc. > Volume 25(4); 1988 > Article

Journal of the Korean Ceramic Society 1988;25(4): 397.

분무열분해법에 의한 MgO-Al2O3-SiO2계 화합물의 분체합성 및 그 특성

박정현, 박찬욱, 조경식

연세대학교 공과대학 요업공학과

A Study on the Preparation of MgO-Al2O3-SiO2 System Ceramic Powders by Spray Pyrolysis Method

ABSTRACT

Spinel, mullite and cordierite powders have synthesized from Mg(NO3)2.6H2O, Al(NO3).9H2O and SiCl4 solution by spray pyrolysis method. The two-fluid nozzle was used as an atomizer. The powders of sinel and mullite were synthesized above 80$0^{circ}C$, but the cordierite composition was noncrystalline for all synthersizing temperature. Those noncrystalline powders were crystallized to $alpha$-cordierite during calcining at 130$0^{circ}C$ for 2hrs. The synthesized spinel, mullite and cordierite powders seem to be consisted of agglomerated hollow spherical particles. For all powders, the particle size ranged from submicron to about 3${mu}{textrm}{m}$ and mean particle size was about 1.4${mu}{textrm}{m}$ in diameter. The specific surface area values of spinel, mullite and cordierite powders were maximum for powders prepared at 100$0^{circ}C$, and those were 45.9, 25.8 and 13.6$m^2$/gr, respectively.