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6 5 4 3 2 1 0.08 0.12 0.16 0.20 Friction Coefficient PEEK/Ceramics Fluorocarbon Resin/PTFE/MoS2 PTFE/MoS2 PEEK/PTFE PTFE/ Pyrrolidone-2 PTFE/ Pyrrolidone-1 Figure 3.6 Friction coefficient (x-axis) vs. wear rate (y-axis) of seven polymeric coatings in CO2 (22 °C and 25 psi) environment at 445 N normal load under dry-oscillatory conditions. Referring to Figure 3.6, all coatings showed relatively low friction coefficient -5 3 values in the range of 0.1 ~ 0.2 while their wear rate was of the order of 10 mm /N·m, which is higher than that of hard coatings such as DLC and CrN coatings (which is in the -8 -9 3 range of 10 ~ 10 mm /N·m (Holmberg and Matthews, 2009)). Note however that the wear rate values for the polymeric coatings represent upper bound estimates since the experiments can run much longer times without further wear, as shown later. The friction and wear behavior is affected by the additives in the polymeric coatings. Specifically, PTFE coatings blended with pyrrolidone showed the best friction performance with a friction coefficient of 0.1. Pyrrolidone, usually referred to as poly (vinyl pyrrolidone), has been investigated for medical applications such as articular cartilage replacement due to its excellent low frictional properties (Katta et al., 2007). Coatings blended with MoS2 33 -5 3 Wear Rate (x10 mm /Nm)PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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