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

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...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2006-01, Vol.89 (1), p.151-155
Main Authors: Ran, Shen, Winnubst, Louis, Wiratha, Wika, Blank, Dave H. A.
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Ceramic sintering
CERAMICS
Chemical industry and chemicals
Copper
COPPER OXIDE
Copper oxides
CUPROUS OXIDE
DENSITY
DOPING
Exact sciences and technology
Materials science
Miscellaneous
OXIDES
Oxygen
PARTIAL PRESSURE
Physical properties
PRESSURE
SINTERING
Technical ceramics
Tetragonal zirconia polycrystals
Yttria stabilized zirconia
Yttrium oxide
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Summary: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 1400°C in air. The reaction between molten Cu2O and yttria as segregated to the Y‐TZP grain boundaries at around 1180°C 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 (>96%) 0.8 mol% CuO‐doped 3Y‐TZP ceramic can be obtained after sintering at 1400°C in flowing oxygen.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1551-2916.2005.00679.x