Analysis of reactions during sintering of CuO-doped 3Y-TZP nano-powder composites


Winnubst, Louis and Ran, Shen and Speets, Emiel A. and Blank, Dave H.A. (2009) Analysis of reactions during sintering of CuO-doped 3Y-TZP nano-powder composites. Journal of the European Ceramic Society, 29 (12). pp. 2549-2557. ISSN 0955-2219

[img] PDF
Restricted to UT campus only
: Request a copy
Abstract:3Y-TZP (yttria-doped tetragonal zirconia) and CuO nano powders were prepared by co-precipitation and copper oxalate complexation–precipitation techniques, respectively. During sintering of powder compacts (8 mol% CuO-doped 3Y-TZP) of this two-phase system several solid-state reactions clearly influence densification behaviour. These reactions were analysed by several techniques like XPS, DSC/TGA and high-temperature XRD. A strong dissolution of CuO in the 3Y-TZP matrix occurs below 600 °C, resulting in significant enrichment of CuO in a 3Y-TZP grain-boundary layer with a thickness of several nanometres. This “transient” liquid phase strongly enhances densification. Around 860 °C a solid-state reaction between CuO and yttria as segregated to the 3Y-TZP grain boundaries occurs, forming Y2Cu2O5. This solid-state reaction induces the formation of the thermodynamic stable monoclinic zirconia phase. The formation of this solid phase also retards densification. Using this knowledge of microstructural development during sintering it was possible to obtain a dense nano–nano composite with a grain size of only 120 nm after sintering at 960 °C.
Item Type:Article
Science and Technology (TNW)
Research Group:
Link to this item:
Official URL:
Export this item as:BibTeX
HTML Citation
Reference Manager


Repository Staff Only: item control page

Metis ID: 257194