Dispersion and Forming of Alumina Powders via Crosslinkable Organic Molecules

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J. Korean Ceram. Soc. > Volume 32(2); 1995 > Article

Journal of the Korean Ceramic Society 1995;32(2): 217.

가교가능한 유기화합물을 이용한 알루미나의 분산과 성형

김봉호, 신평우, 백운규, 정연길¹, 최성철¹, 박철원²

창원대학교 재료공학과
¹한양대학교 무기재료공학과
²한양여자전문대학 도자기공예과

Dispersion and Forming of Alumina Powders via Crosslinkable Organic Molecules

ABSTRACT

Alumina powders were dispersed using crosslinkable organic molecules by electrosteric stabilization and then consolidated by crosslinking of organic molecules. The effect of processing variables such as the physicochemical properties of both solvent media and organic molecules, the proportions of mixed organic media, etc. were studied. FT-IR was used todeduce the mechanism of organic molecules adsorption on the alumina particle surfaces. The adsorption characteristics and the electrokinetic behavior of alumina suspensions were correlated with the stability of particle in alumina suspension using rheological measurements. The green body of alumina consolidated by the chemical crosslinking of the adsorbed organic molecules after the alumina suspension had been stabilized was tough enough for green machining and the sintered alumina fabricated by this proposed process also showed a high bending strength and a homogeneous microstructure.

Key words: Alumina, Electrosteric stabilization, Crosslinking, Stability, Green machining