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Rheology of composite ceramic injection moulding suspensions

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Abstract

Ceramic injection moulding compositions incorporating sinterable silicon nitride powder and silicon carbide whiskers were prepared by twin screw extrusion using a polypropylene-based organic vehicle. Their viscosities in the shear rate range 100 to 1400 sec−1 were measured by capillary rheometry. The relative viscosity (η r)-ceramic volume loading (V) curve fitted the Chong equation

$$\eta _r = \left( {1 + \frac{{0.75V/V_{max} }}{{1 - V/V_{max} }}} \right)$$

whereV max is the volume loading of ceramic at which viscosity approaches infinity. This equation fitted the data for compositions containing ceramic powder as well as particlewhisker suspensions and could thus be used to map relative viscosity as a function of filler loading for all compositions with 0 to 30% SiC based on the ceramic.

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Authors and Affiliations

  1. Department of Materials Technology, Brunel University, UB8 3PH, Uxbridge, Middlesex, UK

    S. J. Stedman & J. R. G. Evans

  2. T & N Technology Ltd, Cawston House, CV22 7SA, Cawston, Rugby, UK

    J. Woodthorpe

Authors
  1. S. J. Stedman
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  2. J. R. G. Evans
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  3. J. Woodthorpe
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Stedman, S.J., Evans, J.R.G. & Woodthorpe, J. Rheology of composite ceramic injection moulding suspensions. J Mater Sci 25, 1833–1841 (1990). https://doi.org/10.1007/BF01045394

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  • DOI: https://doi.org/10.1007/BF01045394

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