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coefficient fluctuation with an average value gradually increasing up to 0.2. This coating was eventually completely penetrated and lost its functionality after around 54 min with an abrupt increase in its COF and NCT. In the case of PTFE/Pyrrolidone-1 coating, its COF was around 0.1 from the beginning of the test with its NCT over 150°C. Consequently, the higher frictional force generates more heat which is being dissipated into the contact interface of the coating thus resulting in a continuous increase of the NCT. Therefore, the PTFE/Pyrrolidone-1 coating failed after 17 min with a sharp increase of both COF and NCT, thus showing relatively weaker thermal performance than any other coatings tested. In the case of PTFE/Pyrrolidone-2 coating, even though it survived the whole duration of the test, its COF and NCT were slightly higher than those at room temperature. For the PTFE/Pyrrolidone-2, which showed the best performance under 75°C, another test under even higher temperature of 110°C was performed to further investigate the frictional behavior and temperature limit, shown in Figure 5.6. This will answer two questions arising from the previous two sets of tests at 23°C (Figure 5.4) and 75°C (Figure 5.5); 1) why is the friction behavior of polymeric coatings deteriorating with increasing NCT, and 2) why PEEK/PTFE coating performed worse than PTFE/Pyrrolidone-2 coating under both temperature conditions. Referring to Figure 5.6, clearly this coating survived the 1-hour test duration even at 110°C, with a NCT slightly over 170°C and stable frictional behavior. Interestingly, the highest temperature condition showed the lowest COF through the whole duration of the test. The 75°C tests showed the highest COF, with the 23°C in-between. This frictional behavior is in 87PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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