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reduce scratching, and offer good load-carrying capacity. Tribological coatings also have the ability to form low shear strength reaction layers and transfer layers on the top surface and the counterface, resulting in weak shear planes and thus low friction (Holmberg and Matthews, 2009). Another type of hard coatings, WC/C-based coatings were also shown to have superior tribological properties not only as far as wear resistance, but also low friction coefficient values as low as 0.05 under dry unidirectional pin-on-disk sliding conditions (Solzak and Polycarpou, 2008). Hard coatings are relatively expensive and exhibit difficulties in coating them on substrates with low surface energy or high roughness (Zhao et al., 2002). Moreover, hard coatings sometimes could wear out the counterface they slide against, due to their relatively high hardness (Sung, 1998), and alternative solutions need to be explored. Recent attention has focused on soft, thermoplastic-based polymer materials such as PTFE and PEEK. As already mentioned in Cannaday and Polycarpou (2005), the bulk form of these materials shows relatively low friction coefficient and self-lubricating properties (Fusaro, 1990), and are also inexpensive and easy to fabricate (Holmberg and Matthews, 2009). PTFE has been used extensively since its discovery because of its desirable tribological properties such as chemical inertness and superb lubricity (Yamane et al., 2007). However, bulk PTFE suffers from poor resistance to wear and creep, because it easily yields in shear due to its relatively low intermolecular strength (Suh, 1986). Thus, PTFE is typically used in the form of composites, either 1) as a matrix filled with various hard fillers and micro/nano particles such as glass fibers, ceramics, MoS2 and carbon nanotubes (CNTs) to enhance its wear resistance, or 2) as a filler into polymeric materials which have good wear resistance but poor frictional properties, such 5PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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