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| Abstract No.: |
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| Title: |
Anisotropic electrical conductivity of copper coatings deposited by HVOF
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| Authors: |
Morteza Aghaee* / Department of Materials Engneering, Isfahan University of Technology , 0098
Mehdi Salehi / Isfahan University of Technology, Iran
Hamidreza Salimijazi/ Isfahan University of Technology, Iran
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| Abstract: |
Copper coatings were deposited on ferrous substrates by utilizing high-velocity oxy-fuel spraying (HVOF). Three different coating process parameters have been used in order to optimise the required electrical charactristics. In this regard microstructure and phases present in the coatings were analyzed by scanning electron microscopy (SEM), x-ray diffraction (XRD) and oxygen analyzer (LECO) respectively. Electrical resistivity of coatings was measured in-plane and through-thickness using the four-contact method. Results have shown that dense coatings with high purity and low level of porosity are required to achieve high electrical conductivity. The coatings exhibited anisotropic resistivities due to the nature of the thermal spray coating microstructure. Microstructural evaluation shown that individual splats morphology and splats interfaces play important roles in the electrical conductivity. Post deposition heat treatment of the thermally sprayed copper coatings improved the conductivity of coating.
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