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takes more time to fill the rougher surface with a polymer material (Burris et al., 2008). Once a continuous and stable transfer film is formed on the counterface and shields the hard asperities, material removal by mechanical interlocking is significantly reduced, thus exhibiting steady-state frictional behavior for the rest of the test duration. Further improvement of the transfer film hardness could occur with the accumulation of fretting cycles due to work hardening caused by repeated plastic deformation (Zhang et al., 2006). Wang and Yan (2007) showed that with increasing sliding, continuity and ductility of the transfer film gradually improved, and the transfer film became smoother. Therefore, once the transfer film is firmly formed on the counterface, it can be thought as another hard coating layer lubricating the interface, which results in the so-called “self-lubricating” property to polymer materials. This is the reason that the PTFE/Pyrrolidone coating did not show any catastrophic failure even after the coating was completely penetrated in the fretting experiments with a reduced diameter pin in Figure 6.6(a). However, the PEEK/PTFE coating showed a very sharp increase of COF (Figure 6.6(b)) as soon as the coating was penetrated because there was no uniform transfer film that was formed on the pin surface as seen in Figure 6.10(b). The polymer-to-metal sliding can be summarized in two steps; (1) flattening of the rough metal surface by transferred materials during the transient period, and then (2) self- lubricating effect of transfer film during steady-state sliding. 122PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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