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fretting cycles, the whole pin surface was covered by the transfer film, and thus protecting the polymer film from damage by sharp and hard metal asperities (i.e., the transfer film acting as a lubricious film at the contact interface). 20 10 (a) PTFE/Pyrrolidone 20 10 (b) PTFE/Pyrrolidone After 20 min Height (μm) Height (μm) 00 -10 -10 -20 -20 After 6 min -30 -30 02460246 Distance (mm) Distance (mm) Figure 6.12 Typical profilometric cross-section wear tracks of PTFE/Pyrrolidone coating after (a) 6 min and (b) 20 min of fretting experiments with the 3.2 mm pin. The process of transfer film formation contributes to the initial transient wear behavior in polymer-on-metal sliding. During this period, higher COF and significant wear are usually observed. Figure 6.12(a) and Figure 6.12(b) show the PTFE/Pyrrolidone coating wear track after 6 min and after 20 min of testing using the 3.2 mm diameter pins, respectively. It is seen that after 6 min of testing, the coating was almost penetrated, showing the same wear depth as that after 20 min of testing. Therefore, the majority of material removal occurs at the beginning of the test, thus resulting in higher friction coefficient and wear rate during this transient period; at the same time the transfer films are formed on the metal counterface. Depending on the roughness of the counterface, this initial transient period could be different, because it 121PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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