Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effects of Solvent Mixtures on Dispersion and Rheology of Alumina/zirconia Tape Casting Slurries

알루미나/지르코니아 테이프 케스팅 슬러리의 분산과 레올로지에 미치는 용매혼합의 영향

  • Kim, Ji-Hyeon (Dept.of Materials Science Engineeirng, Busan National University) ;
  • Yang, Tae-Yeong (Dept.of Materials Science Engineeirng, Busan National University) ;
  • Lee, Yun-Bok (Dept.of Materials Science Engineeirng, Busan National University) ;
  • Yun, Seok-Yeong (Dept.of Materials Science Engineeirng, Busan National University) ;
  • Park, Heung-Chae (Dept.of Materials Science Engineeirng, Busan National University)
  • Published : 2001.06.01
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Abstract

The effects of methyl isobutyl ketone(MIBK)/ethanol(EtOH) solvent mixtures on the dispension, particle size distribution and rheology of $Al_2$O$_3$/ZrO$_2$ nonaqueous suspensions were investigated by measuring sedimentation density and viscosity. The sedimentation density of $Al_2$O$_3$ and ZrO$_2$ particles increased in MIBK-rich($\geq$60 vol%) solvents with 'Hypermer' KD-1 as a dispersant. The ball-milled suspensions in 80MIBK/20EtOH(vol%) solvent exhibited the narrow and unimodal particle size distribution. Although all Suspensions exhibited the Pseduo-Plastic flow(Shear thinning) the shear thinning behavior was somewhat different depending on the mixture ratio of $Al_2$O$_3$/ZrO$_2$ and MIBK/EtOH. Under a given shear rate( <300 s$^{-1}$ for $Al_2$O$_3$; <3000 s$^{-1}$ for ZrO$_2$) the strongest shear thinning appeared in the $Al_2$O$_3$ and ZrO$_2$ suspensions with pure MIBK solvent. The shear thinning was nearly independable on the mixture ratio of $Al_2$O$_3$/ZrO$_2$ in case of using the identical solvent(80MIBK/20EtOH, vol%).

Al$_2$O$_3$/ZrO$_2$ 비수성 현탁액의 분산과 레올로지에 미치는 methyl isobutyl ketone (MIBK) /ethanol (EtOH) 용매혼합의 영향을 침전밀도, 점도를 측정함으로써 조사하였다. 분산제 'Hypermer' KD-1이 첨가된 다량의 MIBK를 함유하는 용매 ($\geq$60vol%)에서 $Al_2$O$_3$와 ZrO$_2$ 입자의 침전밀도는 증가하였다. 80MIBK/20EtOH(vol%)에서 ball milling한 현탁액이 좁고 unimodal한 입자크기분포를 나타내었다. 모든 현탁액은 의가소성유동을 나타내었으나 shear thinning은 $Al_2$O$_3$/ZrO$_2$의 혼합비, MIBK/EtOH의 혼합비에 따라서 다소 다르게 거동하였다. 순수한 MIBK를 사용한 $Al_2$O$_3$(<300 s$^{-1}$ ) 및 ZrO$_2$(<3000 s$^{-1}$ ) 현탁액은 주어진 전단속도범위내에서 가장 강한 shear thinning을 나타내었다. 동일한 용매 (80MIBK/20EtOH, vol%)를 사용한 경우의 shear thinning은 $Al_2$O$_3$/ZrO$_2$의 혼합비에 거의 의존하지 않았다.

Keywords

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