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fiber (carbon, aramid or glass fibers). The main function of the filler here is to strengthen the polymer matrix and thus increase the load-bearing capacity of the composite. The coefficient of friction remains low or sometimes increases marginally but the wear resistance can be increased up to an order of magnitude (Burris and Sawyer, 2006 and Briscoe and Sinha, 2005). Cannaday and Polycarpou (2005) showed that PTFE blended with PEEK had superior tribological characteristics to unfilled polymers and metals under specific compressor operating conditions. These days, the use of nano size particles in polymers has become quite promising. Superior mechanical properties of a polymer nanocomposite are attributed to its significantly high interface area between the filler (nano-particles or nano-fibers) and the matrix (a polymer). High interface leads to a better bonding between the two phases and hence better strength and toughness properties over unfilled polymer or traditional micro- composites. For all polymer/nano-particle systems, there will be an optimum amount of the nanoparticles beyond which there will be a reduction in the toughness as the stiffness and strength increase. Chen et al. (2003) showed that carbon nanotubes (CNTs) significantly increased the wear resistance of PTFE composites and decreased their coefficient of friction with optimum 15-20 vol.%. The CNTs greatly reinforced the structure of the PTFE-based composites and thereby greatly reduced the adhesive and plough wear of CNT/PTFE composites. The disadvantage of using fillers (especially the particulate type) is that the composite material may become somewhat less tough compared to the pristine polymer and thus induce wear by fatigue. However, this can be avoided by proper optimization of the mechanical and tribological properties. 16PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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