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Gelcasting of zirconia with agarose as a gelling agent was evaluated, and the rheological behavior of the suspensions was studied. For certain compositions, a viscosity low enough for the suspensions to be processed as well as a sufficient wet green strength to avoid deformation of cast components due to mechanical stresses was obtained. Futhermore, it was possible to increase the storage modulus of the cast material by a reduction of the gelation temperature, which facilitated demolding. Sintered densities above 99% were achieved and high bending strength was obtained. The results show that the shaping technique has the potential to be used for fabrication of advanced zirconia materials.
Erik Adolfsson (Mon,) studied this question.