Influence of inclination angle of plate on friction, stick-slip and transfer layer-A study of magnesium pin sliding against steel plate
In this study, sliding experiments were conducted using pure magnesium pins against steel plates using an inclined pin-on-plate sliding tester. The inclination angle of the plate was varied in the tests and for each inclination angle, the pins were slid both perpendicular and parallel to the unidirectional grinding marks direction under both dry and lubricated conditions. SEM was used to study morphology of the transfer layer formed on the plates. Surface roughness of plates was measured using an optical profilometer. Results showed that the friction, amplitude of stick-slip motion and transfer layer formation significantly depend on both inclination angle and grinding marks direction of the plates. These variations could be attributed to the changes in the level of plowing friction taking place at the asperity level during sliding.
Frictional behavior of Ag nanodot-pattern fabricated by thermal dewetting
Abstract The frictional behavior of a Ag nanodot-pattern fabricated on a silicon substrate by the thermal dewetting process was investigated. The motivation was to decrease the micro/nano-scale friction of thin films by utilizing nano-patterns to control the real contact area. A Ag thin film of 20 nm in thickness was initially deposited on a silicon wafer by RF sputtering. Then, a thermal dewetting process was carried out at annealing temperatures ranging from 250 to 550 °C in order to fabricate patterns with different morphologies. As a result, hemispherical shaped Ag nanodot-patterns could be fabricated on the silicon wafer. Friction tests were performed using an atomic force microscope (AFM) with a 44 μm diameter micro-sphere attached to the tip of the cantilever. Both initial and steady state frictional forces were measured. It was found that the frictional force of nanodot-patterned specimens was significantly lower than that of the smooth Ag film. Moreover, there was an optimum annealing temperature that resulted in the lowest friction coefficient. The effect of contact area on the frictional force was also assessed based on the experimental results and contact analysis.
Yeats, Eliot, Pound and the Politics of Poetry: Richest to the Richest
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