Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effect of Solvent Mixture on the Properties of LTCC Slurry and Green Sheets

LTCC 슬러리 및 그린시트의 물성 변화에 미치는 혼합용매 조성의 영향

  • Cho, Beom-Joon (eMD Lab(LTCC), Central R&D Institute, Samsung Electro-Mechanics CO.,LTD.) ;
  • Park, Eun-Tae (eMD Lab(LTCC), Central R&D Institute, Samsung Electro-Mechanics CO.,LTD.)
  • 조범준 (삼성전기 기술총괄 eMD Lab(LTCC)) ;
  • 박은태 (삼성전기 기술총괄 eMD Lab(LTCC))
  • Published : 2006.09.27
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Abstract

The effects of binary solvent mixtures with various ratios of toluene and ethanol on the properties of slurries and green sheets were investigated. Viscosity of slurry was changed by varying the ratio of solvent mixture which affected the solubility of binder. The relative solvency behavior of a solvent mixture could be predicted with the Hildebrand solubility parameter(${\delta}$) and hydrogen bonding index( ${\gamma}$). The minimum viscosity, the best dispersion of binder, was reached at the composition of toluene:ethanol=4:6, which corresponded to our forecast. The mechanical properties of green sheets related to evaporation of solvents were influenced by the composition of the solvent mixture. At the azeotrope the skin was formed on a drying cast during the drying process because of fast evaporation. At a range of concentrations over 50wt% toluene, green sheets could not be fully dried at low temperature due to excessive toluene. The mechanical properties of green sheets were excellent at the azeotrope-like composition of toluene:ethanol=4:6 which has a little excess of toluene over the azeotrope.

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