Journal of Materials Science

, Volume 27, Issue 19, pp 5297–5302 | Cite as

Improvement of the rheological properties of the zirconia/polypropylene system for ceramic injection moulding using coupling agents

  • M. Takahashi
  • J. Hayashi
  • S. Suzuki
  • Y. Ishigure


In order to improve the rheological properties of the zirconia/polypropylene system for ceramic injection moulding, the zirconia powder was surface-treated with aluminate (A), silane (S) and titanate (T) coupling agents dissolved in toluene. 2% additions of these coupling agents decreased the torque,Th, for compounding the zirconia filled-polypropylene after 1 h at 180°C. The surface treatment also reduced the viscosity, ηa, of the compound, the effectiveness of the coupling agents on viscosity reduction being T > S > A. On the contrary, the apparent activation energy,Ea, for flow of the compound increased when fluidity was promoted by surface treatment. Rheological measurements in systems with different titanate concentrations showed that the three parameters,Th, ηa, andEa, remained nearly constant for coupling agent additions of over 2%. This critical concentration of 2% showed good correspondence to the optimum concentration evaluated from thermogravimetric analysis of the powders.


Viscosity Zirconia Silane Activation Energy Torque 
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Copyright information

© Chapman & Hall 1992

Authors and Affiliations

  • M. Takahashi
    • 1
  • J. Hayashi
    • 1
  • S. Suzuki
    • 1
  • Y. Ishigure
    • 2
  1. 1.Ceramics Research LaboratoryNagoya Institute of TechnologyTajimiJapan
  2. 2.Gifu Prefectural Industrial Research Technical CenterKasamatsuJapan

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