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10 to 30 min. PTFE/Pyrrolidone-2 exhibited the lowest average COF value of 0.043, PTFE/MoS2 the second lowest, and then PTFE/Pyrrolidone-1. However, their difference was very small with all three coatings being in the range of 0.043 ~ 0.047. These are significantly low friction coefficient values, bearing in mind that these are oil-less aggressive operating conditions. PTFE/MoS2 coating showed the lowest wear rate with a -7 3 value less than 10 mm /Nm. The friction coefficient for the PEEK-based coatings was almost twice as high compared to the PTFE-based coatings, and their wear rate was in the -6 -53 range of 6.73×10 ~ 1.63×10 mm /N·m (i.e., an order of magnitude higher than PTFE- based coatings). Table 3.3 Average COF, NCT and wear rates of the polymeric coatings tested under dry- unidirectional conditions for 30 min. Group 1 Group 2 Group 3 Polymeric Coatings PTFE/Pyrrolidone-1 PTFE/Pyrrolidone-2 PTFE/MoS2 PEEK/PTFE PEEK/Ceramic Resin/PTFE/MoS2 Fluorocarbon Ave. COF (Std.) (10 ~ 30 min) 0.047 (0.007) 0.043 (0.003) 0.044 (0.005) 0.079 (0.008) 0.092 (0.010) Scuffed Scuffed Wear Rate (Std.) 3 (mm /N·m) 1.54E-6 (2.11E-7) 1.23E-6 (2.97E-7) 3.76E-7 (8.64E-8) 1.63E-5 (1.28E-6) 6.73E-6 (9.77E-7) 9.01E-6 (2.39E-7) 1.52E-5 (6.02E-7) NCT (Std.) (°C) (10 ~ 30 min) 142.8 (5.9) 148.6 (2.3) 148.7 (3.8) 219.8 (5.2) 241.9 (6.5) - - Figure 3.10 shows a direct comparison of both friction (linear scale) and wear (logarithmic scale) behavior of all coatings. From this comparison, it is clearly seen that the wear rates for all coatings tested under oscillatory conditions, are clustered in very 40PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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