THE INFLUENCE OF SnO2 NANOPARTICLES AND METHOD OF THEIR INTRODUCTION ON MICROSTRUCTURE AND PROPERTIES OF Ag-SnO2 ELECTRICAL CONTACTS
نویسندگان
چکیده
The influence of SnO2 nanoparticles and method of their introduction in silver matrix on microstructure and physical properties such as density, porosity, hardness and electrical conductivity of Ag-SnO2 electrical contact materials were studied. The SnO2 nanoparticles were introduced by conventional powder mixing and by template method using different templates. All investigated samples were produced by powder metallurgy method followed by mechanical treatment. When compared, samples with nano particle metal oxide exhibit higher dispersion than their microparticle counterpart. However, comparing the microstructures, the two materials produced by template method display further increase of dispersion. Consequently, after sintering and forging these samples have higher hardness, density and lower porosity. The observed enhancement of hardness of almost 30 % can be attributed to greater dispersion hardening of otherwise soft silver matrix. The measured values of electrical conductivity of all investigated samples are comparable with conductivities of commercial Ag-SnO2 electrical contact materials.
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