Abstract
The effect of processing parameters on the hardness and toughness of yttria-doped zirconia/nickel nanocomposites is reported. The experimental procedure consists in the deposition of nickel nanoparticles––previously obtained from nickel nitrate salts––on the surface of the zirconia powders. Slight changes in the proposed processing route (i.e. drying temperature of powders) gave rise to a noticeable decrease in the hardness (15–20%). However, no effect was observed on the toughness values in the studied composition range (0–30 vol% Ni). These results have been explained in terms of the nickel particle size distribution and agglomeration due to differences in the melting temperature of nickel nanoparticles, and because of epitaxial growth of nickel on the zirconia surface. For comparison purposes, samples obtained following a conventional wet-processing route starting from micrometric nickel and yttria-doped zirconia powders were prepared. In this case, the toughness is strongly dependent on the nickel fraction. This fact has been related to the weak bonding between metal and ceramic particles.
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Acknowledgements
This research has been supported by the European Union under project IP NANOKER (NMP3-CT-2005-515784), by the Spanish Ministry of Education and Science under the project MAT2003-04199-C02-01 and by the autonomous region of Madrid under project GR/MAT/0432/2004. S. Lopez-Esteban has been supported by the Spanish Ministry of Education and Science under Ramón y Cajal Program.
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Lopez-Esteban, S., Rodriguez-Suarez, T., Esteban-Betegón, F. et al. Mechanical properties and interfaces of zirconia/nickel in micro - and nanocomposites. J Mater Sci 41, 5194–5199 (2006). https://doi.org/10.1007/s10853-006-0441-9
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DOI: https://doi.org/10.1007/s10853-006-0441-9