한국세라믹학회지 (Journal of the Korean Ceramic Society)

  • 제39권3호
  • /
  • Pages.299-307
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  • 2002
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  • 1229-7801(pISSN)
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  • 2234-0491(eISSN)
한국세라믹학회 (The Korean Ceramic Society)
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직응집성형법을 이용한 질화규소의 실형상 성형공정 및 성형특성

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

  • 정윤성 (한양대학교 공과대학 세라믹공학과) ;
  • ;
  • 정연길 (창원대학교 공과대학 세라믹공학과) ;
  • 백운규 (한양대학교 공과대학 세라믹공학과)
  • 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)
  • 발행 : 2002.01.01
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초록

본 연구에서는 복잡 형상의 세라믹체를 효율적으로 성형할 수 있어 새로운 성형기법으로 부각되고 있는 직응집성형(Direct Coagulation Casing, DCC)공정기술에 관하여 콜로이드 계면화학을 이용하여 연구하였다. 높은 고형분량을 가지는 안정된 질화규소 슬립을 제조하기 위하여 분산제, 소결조제 그리고 응집제 각각이 다양한 공정변수에 미치는 영향에 대하여 평가하였다. 1.0 wt% Tetraethylammonium Hydroxide(TEAH)를 첨가하여 염기영역에서 소결조제를 포함한 안정된 51vol%의 질화규소 슬립을 제조할 수 있었다. 질화규소 슬립은 첨가된 $Al(CH_3COO)_2OH$의 온도증가에 따른 열분해를 이용하여 직응집성 유도하였다. 염기영역에서 $Al^{3+}$ 이온들이 aluminum hydroxide$(Al(OH)_3)$ 석출되면서 슬립내 $OH^-$ 농도를 감소시켜 질화규소 슬립을 직응집시켰다.

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.

키워드

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