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Dispersion Characteristics of Slurry and Preparation of Ceramic Paper

세라믹섬유지의 제조 및 슬러리 분산특성

  • Yoo, Yoon-Jong (Functional Materials Research Center, Korea Institute of Energy Research) ;
  • Kim, Joon-Soo (Functional Materials Research Center, Korea Institute of Energy Research) ;
  • Kim, Hong-Soo (Functional Materials Research Center, Korea Institute of Energy Research) ;
  • Ahn, Young-Soo (Functional Materials Research Center, Korea Institute of Energy Research) ;
  • Han, Moon-Hee (Functional Materials Research Center, Korea Institute of Energy Research) ;
  • Jang, Gun-Eik (Department of Materials Engineering, Chungbuk National University)
  • 유윤종 (한국에너지기술연구원 기능소재연구센터) ;
  • 김준수 (한국에너지기술연구원 기능소재연구센터) ;
  • 김홍수 (한국에너지기술연구원 기능소재연구센터) ;
  • 안영수 (한국에너지기술연구원 기능소재연구센터) ;
  • 한문희 (한국에너지기술연구원 기능소재연구센터) ;
  • 장건익 (충북대학교 재료공학과)
  • Published : 2002.01.01

Abstract

The sedimentation characteristics of ceramic fiber were analyzed when viscosity of the slurry for ceramic paper formation was varied and zeta potential change and degree of dispersion with pH were studied as well. The proper viscosity of the slurry for dispersion of fibers was between 28 and 31 cps. Zeta potential of the slurry was sensitively changed with pH adjustment and showed maximum value of -35~-36 mV at ph 7.5~9.5, which indicated better dispersion of ceramic fiber as zeta potential of the slurry was increased. The sedimentation rate of ceramic fiber in a slurry was reported minimum at the maximum zeta potential. Water content of the casted paper should be lower than 83% after vacuum dehydration for retention of binder and lower than 62% after press rolling for wet paper handling. The obtained ceramic paper had tensile strength and basis weight, $102 kgf/cm^2$ and $98 g/m^2$, respectively.

$Al_2O_3-SiO_2$계 세라믹 화이버를 주원료로 하는 세라믹섬유지를 제조하기 위하여 스러리 점도변화에 따른 세라믹화이버의 침강특성과 pH 변화에 따른 제타전위의 변화와 세라믹화이버 분산특성과의 관계를 분석하였다. 슬러리에서 세라믹화이버의 해섬 및 분산을 위한 슬러리 적정 점도는 28~31 cps이었고, pH 변화에 따라 제타전위는 민감하게 변화하여 pH 7.5~9.5에서 -35~-36 mV로 최대치를 나타내었으며, 이때 세라믹화이버의 침강량도 가장 적게 나타나 슬러리의 제타전위가 증가함에 따라 세라믹화이버의 분산도 잘 이루어짐을 알 수 있었다. 습식초지공정 중 흡입탈수는 함수율 83 wt% 이상으로 유지시켜야 바인더 손실을 막을 수 있었으며, 압축탈수 후 함수율이 62wt% 미만이 되어야 습식회수가 가능하였다. 제조된 세라믹섬유지는 인장강도 $102 kgf/cm^2$, 평량 $98 g/m^2$를 나타내었다.

Keywords

References

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