The influence of pressure on the electrical tribology of carbon nanotube–silver–graphite composite |
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Authors: | Yi Feng Juan Wang Min Zhang Yi Xu |
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Affiliation: | (1) Department of Material Science and Engineering, Hefei University of Technology, Hefei, 230009, P.R. China |
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Abstract: | The effect of pressure on the friction and wear properties of carbon nanotube–silver–graphite composite with 10 A/cm2 and without electrical current has been investigated. The results show that the wear of composite increase with the increase
of pressure under mechanical wear, but the wear of composite varies with the pressure in the shape of U under electrical wear.
Pressure is a factor related to both the electrical heating, friction heating and abrasive wear. At a reasonable load without
much increase in the frictional heating and mechanical wear, the electrical heating could be reduced which will result in
lower total thermal effect, and the resultant wear rate could arrive at a minimum. The electrical wear is higher than mechanical
wear by 6–20 times. The differences between the no-current and with-current wear is Joule heat released in the friction zone
which leads to breakdown of the lubricating film, roughening of the brush surface, and intensification of the adhesive interaction
at the contact spots. The wear of positive brush is higher than that of negative brush. The friction coefficient of composite
with current is greater than that without current. |
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