Sintering Behavior of 0.8 mol%-CuO-Doped 3Y-TZP Ceramics


Ran, Shen and Winnubst, Louis and Wiratha, Wika and Blank, Dave H.A. (2006) Sintering Behavior of 0.8 mol%-CuO-Doped 3Y-TZP Ceramics. Journal of the American Ceramic Society, 89 (1). pp. 151-155. ISSN 0002-7820

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Abstract:In recent years, 3 mol% yttria-stabilized tetragonal zirconia
polycrystals (3Y-TZP) doped with copper oxide has obtained
increasing interest due to its enhanced superplastisity and good
potential in tribological applications. In this work, the effect of
addition of small amounts (0.8 mol%) of copper oxide on the
sintering behavior of 3Y-TZP was studied using a dilatometer
and high-temperature X-ray diffraction (XRD). A qualitative
sintering model was established based on several reactions during
sintering as indicated by thermal analysis and XRD. Some
of these reactions remarkably retard densification and consequently
result in low final density (86%) of the sample sintered
at 14001C in air. The reaction between molten Cu2O and yttria
as segregated to the Y-TZP grain boundaries at around 11801C
leads to the depletion of yttria from Y-TZP grains, which results
in the formation of monoclinic phase during cooling. A relatively
higher oxygen partial pressure can inhibit the dissociation of
CuO to Cu2O. This inhibition in dissociation is one of the reasons
why a dense (496%) 0.8 mol% CuO-doped 3Y-TZP ceramic
can be obtained after sintering at 14001C in flowing
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Copyright:© 2006 Wiley InterScience
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