Journal of Mining and Metallurgy, Section B: Metallurgy 2012 Volume 48, Issue 1, Pages: 131-141
https://doi.org/10.2298/JMMB111101013C
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Comparison of properties of silver-metal oxide electrical contact materials
Ćosović V. (Institute of Chemistry, Technology and Metallurgy, Belgrade)
Talijan N. (Institute of Chemistry, Technology and Metallurgy, Belgrade)
Živković D. (Technical Faculty, Bor)
Minić D. (Faculty of Technical Sciences, Kosovska Mitrovica)
Živković Ž. (Technical Faculty, Bor)
Changes in physical properties such as density, porosity, hardness and
electrical conductivity of the Ag-SnO2 and Ag-SnO2In2O3 electrical contact
materials induced by introduction of metal oxide nanoparticles were
investigated. Properties of the obtained silver-metal oxide nanoparticle
composites are discussed and presented in comparison to their counterparts
with the micro metal oxide particles as well as comparable Ag-SnO2WO3 and
Ag-ZnO contact materials. Studied silvermetal oxide composites were produced
by powder metallurgy method from very fine pure silver and micro- and
nanoparticle metal oxide powders. Very uniform microstructures were obtained
for all investigated composites and they exhibited physical properties that
are comparable with relevant properties of equivalent commercial silver based
electrical contact materials. Both Ag-SnO2 and Ag- SnO2In2O3 composites with
metal oxide nanoparticles were found to have lower porosity, higher density
and hardness than their respective counterparts which can be attributed to
better dispersion hardening i.e. higher degree of dispersion of metal oxide
in silver matrix.
Keywords: silver based electrical contacts, metal oxide nanoparticles, powder metallurgy, physical properties