Superplastic deep drawing of tetragonal zirconia ceramics at 1160°C


Winnubst, A.J.A. and Boutz, M.M.R. (1998) Superplastic deep drawing of tetragonal zirconia ceramics at 1160°C. Journal of the European Ceramic Society, 18 (14). pp. 2101-2106. ISSN 0955-2219

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Abstract:Superplastic forming under biaxial tension of tetragonal zirconia (Y-TZP) is investigated by pushing a hemispherical punch (radius 6 mm) on Y-TZP which was placed on a ring with an inner diameter of 16·7 mm. Dense Y-TZP samples with a grain diameter of 125 nm could be elongated to a dome height of at least 8 mm at a temperature as low as 1160°C. Such elongations could not be achieved at this very low temperature when the ceramic had a grain diameter of 250 nm. At a grain size of 250 nm differences in deformation behaviour were observed for different types of Y-TZP powders. This is explained by the fact that at higher cavity concentration in the sintered compact the sample deforms at lower forces but fractures at lower elongations.
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