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http://dx.doi.org/10.4191/KCERS.2002.39.3.299

Near-Net-Shape Forming and Green Properties of Silicon Nitride by Direct Coagulation Casting Technique  

Jung, Yun-Sung (Department of Ceramic Engineering, Hanyang University)
Pagnoux, Cecile (Ecole Nationale Superieure de Ceramique Industrielle)
Jung, Yeon-Gil (Department of Ceramic Science and Engineering, Changwon National University)
Paik, Un-Gyu (Department of Ceramic Engineering, Hanyang University)
Publication Information
Journal of the Korean Ceramic Society / v.39, no.3, 2002 , pp. 299-307 More about this Journal
Abstract
In this proposed study, a new emerging shape forming technique Direct Coagulation Casting(DCC) which enables to fabricate complex-shaped ceramic parts has been investigated using colloid surface chemistry. Various process variables affected by dispersant, coagulation agent and sintering additives, have been evaluated in order to achieve highly concentrated stabilized silicon nitride suspensions. A high solid loading of 51 vol% in the dispersed silicon nitride suspension was prepared with 1.0wt% Tetraethylammonium Hydroxide (TEAH), which obtained a stable silicon nitride suspension with sintering additives $(Al_2O_3\;and\;Y_2O_3)$ in alkaline regions. The addition of hydroxyaluminium diacetate into the suspension, which decomposed at elevated temperatures, led to coagulate of a silicon nitride suspension. In a basic medium, aluminum ions precipitated to aluminum hydroxide $(Al(OH)_3)$, leading to decreased $OH^-$ concentration and, thus, coagulated suspension.
Keywords
Silicon nitride; Dispersion; Direct Coagulation Casting(DCC); Suspension;
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