Polymeric Interactions of Dispersant and Binder in Aqueous Silicon Nitride Suspensions

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J. Korean Ceram. Soc. > Volume 32(8); 1995 > Article

Journal of the Korean Ceramic Society 1995;32(8): 901.

질화규소 현탁액에서 분산제와 결합제의 상호작용연구

김봉호, 김명호¹, 이수², 백운규²

창원대학교 재료공학과
¹창원대학교 재료공학가
²창원대학교 화학과

Polymeric Interactions of Dispersant and Binder in Aqueous Silicon Nitride Suspensions

ABSTRACT

In aqueous slurry processing of silicon nitride, the interaction of dispersant and binder used as polymeric processing additives on the silicon nitride particle surface was studied to identify the effect of these processing polymeric additives on the ceramic powder processing. The adsoprtion isotherm study of anionic organic molecule as dispersant and nonionic organic molecules as binder of silicon nitricde was studied to investigate the effect of these processing organic additives on the physicochemical properties of silicon nitride particles. As anionic molecule adsorbed onto silicon nitrice surface, the IEP of silicon nitride shifted toward acidic pH and changed the stability of silicon nitride particle. However, the adsorption of binder as nonionic organic molecule onto silicon nitride surface did not changed the IEP but caused the decrease of electrostatic potentials of silicon nitride. These distinctive adsorption behaviors of organic additives on silicon nitride particles can be closely correlated to the stability of silicon nitride particles suspended in aqueous media.

Key words: Silicon nitride, Dispersant, Binder, Adsorption, Dispersion