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Mullite-zirconia composites: Effect of citric acid addition on slip and cast properties

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Abstract

Dispersion of mixed suspensions of zircon and α -alumina using citric acid as dispersant followed by pressure filtration produced after sintering (1600∘C—2 h) dense mullite-zirconia composites. The effect of citric acid addition and pH on the rheological behavior of the mixed suspensions (57 vol%) was examined. Most of flow curves showed a shear thinning behavior at low shear rates reaching the viscosity a plateau at high shear rates. Newtonian viscosity at high shear rates values decreased to a minimum and then increased with increasing the amount of dispersant added. Compacts prepared from well stabilized suspensions achieved a maximum relative density of 72% (theoretical) which is slightly higher than that obtained from suspensions dispersed with a polyelectrolyte. Characteristics of sintered compacts such as density and crystalline phase composition by XRD were determined.

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Authors and Affiliations

  1. CETMIC (Centro de Tecnología de Recursos Minerales y Cerámica), Cno. Centenario y 506. C.C.49 (B 1897 ZCA) M.B. Gonnet, Prov. de Buenos Aires, Argentina

    L. B. Garrido

  2. CONICET-UNLP-CIC, Cno. Centenario y 506. C.C.49 (B 1897 ZCA) M.B. Gonnet, Prov. de Buenos Aires, Argentina

    E. F Aglietti

Authors
  1. L. B. Garrido
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  2. E. F Aglietti
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Correspondence to L. B. Garrido.

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Garrido, L.B., Aglietti, E.F. Mullite-zirconia composites: Effect of citric acid addition on slip and cast properties. J Mater Sci 40, 5161–5166 (2005). https://doi.org/10.1007/s10853-005-4406-1

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  • DOI: https://doi.org/10.1007/s10853-005-4406-1

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