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of viscosity and shearing strength of the polymer (Zhang et al., 2006). This is why the frictional behavior of PTFE/Pyrrolidone-2 coating with elevated temperature was as shown in Figure 5.6. Figure 5.7 summarizes the average friction coefficient vs. NCT of PTFE/Pyrrolidone-2 coating from the in-situ results of Figure 5.6. First, the COF increased with increasing NCT and showed the highest COF value (0.057) at a NCT of 155°C. This temperature, 155°C is considered as the actual Tg of PTFE/Pyrrolidone-2 polymers and slightly higher than that of pure PTFE (130°C) due to its additives (Araki, 1965). Then, as the NCT increased further, the COF decreased to 0.026 due to the change of the state of the polymer. In the case of PEEK/PTFE coating, it didn’t show such frictional behavior with increasing temperature and failed at 75°C due to its semi-crystalline microstructure (Chapter 4). Usually, amorphous structured polymers present more viscoelastic features with clear Tg, with the transition region suppressed in crystalline materials, thus there is no abrupt drop of the modulus (shearing strength). In this case, their viscoelastic property is more affected by melting temperature (Tm) rather than Tg, and thus their plasticity continuously increases up to Tm. That’s why the COF of PEEK/PTFE coating was relatively high and being fully plastic at over 200°C NCT (Figure 5.4), and eventually failed at higher NCT conditions as seen in Figure 5.5. 91PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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