Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Dispersion and Rheological Characteristics of Alumina Slurries in Aqueous Tape-casting Using Acrylate Binder

Acrylate를 결합제로 사용한 수계 테이프 캐스팅에서 알루미나 슬러리의 분산 및 점성 특성

  • Cho, Yu-Jeong (Department of Ceramic Engineering, Yonsei University, Multifunctional Ceramics Research Center, Korea Institute of Science and Technology) ;
  • Park, Il-Seok (Department of Ceramic Engineering, Yonsei University, Multifunctional Ceramics Research Center, Korea Institute of Science and Technology) ;
  • Moon, Joo-Ho (Department of Ceramic Engineering, Yonsei University) ;
  • Kim, Dae-Joon (Multifunctional Ceramics Research Center, Korea Institute of Science and Technology)
  • 조유정 (연세대학교 세라믹공학과, 한국과학기술연구원 복합기능세라믹스연구센터) ;
  • 박일석 (연세대학교 세라믹공학과, 한국과학기술연구원 복합기능세라믹스연구센터) ;
  • 문주호 (연세대학교 세라믹공학과) ;
  • 김대준 (한국과학기술연구원 복합기능세라믹스연구센터)
  • Published : 2002.01.01
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Abstract

Measurements of sedimentation, solid loading, zeta potential, and viscosity were employed to determine a proper dispersant and its amount for a well dispersed alumina powders in aqueous alumina tape casting using acrylate as a binder. Polycarboxylic acid was the most effective one among various dispersants considered in the present study and its amount was 0.23∼0.24 g per 100 g alumina for a dispersion. Better dispersion was obtained as an increase of dispersant addition. However, the dispersion was hindered as the amount of dispersant was higher than the optimum amount because of bridging or tangling of polymer chains. Excellent aqueous alumina tapes were prepared from the slurry containing the optimum amount of the polycarboxylic acid (0.2g), alumina powders(100 g), acrylate and Benzoflex as binder and plasticizer, respectively. The viscosity of the slurry was 570 cps and the alumina loading in the tape was 57 vol%.

Acrylate 수계 결합제를 사용한 알루미나 테이프 캐스팅용 슬러리의 완전분산을 위한 최적의 분산제와 분산제량을 결정하기 위해 침강실험, 분말 함유량 실험, 점도 및 zeta 전위 측정을 행하였다. 알루미나 슬러리의 완전분산은 분산제를 polycarboxylic acid로 했을 때 얻어졌으며, 최적의 첨가량은 알루미나 100에 대하여 0.23∼0.24g 이었다. 분말에 대한 분산제량이 증가할수록 분산은 잘 이루어졌으나, 일정량 이상이 첨가되면 분산제가 용매 안에 과잉으로 존재하여 분산을 저해하는 요인으로 작용하였다. 테이프 캐스팅용 슬러리는 100g의 알루미나 분말에 0.2g의 polycarboxylic acid를 첨가하였을 때 분산 및 테이프 특성이 가장 우수하였고, 이 때 혼합한 결합제는 acrylate였고, 가소제는 Benzoflex를 사용하였다. 이 때 슬러리 최적 점도는 약 570 cps였고, 테이프 내 알루미나 량은 57 vol%이었다.

Keywords

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