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2.3.2 Soft lubricating fillers in a hard (strong) matrix: Interface modification This type of composite utilizes the low shear strength and self-lubricating properties of the filler to reduce the coefficient of friction and, as a result, wear and frictional heating is drastically reduced. The main requirement is the availability of the filler at the interface in sufficient amount such that a reduction in the coefficient of friction and an increase in the wear resistance can be realized. Most common filler and matrix in this type of composites are PTFE filler and PEEK matrix (Cannaday and Polycarpou, 2005, Hufenbach et al., 2003, Bijwe et al., 2005, and Lal et al., 2007). Hufenbach et al. (2003) showed that the inclusion of PTFE powder in PEEK matrix significantly improved the tribological performance of the PEEK composite without showing any scuffing behaviors. An improvement of 30 times in the wear rate at 7.5 wt.% and 5 times in friction coefficient at 30 wt.% was observed due to blending. Also, Lal et al. (2007) showed that PTFE filled PEEK diminished stick-slip tendency of PEEK and fluctuations in COF with very low and stable values. The disadvantage of this type of composite is obviously the reduction in the strength and load-carrying capacity of the material in the composite form. Hence, adding this type of filler beyond a certain percentage by volume or by weight would be counterproductive for tribological performance due to a drastic decrease in the bulk strength as mentioned above in Hufenbach et al. (2003). Therefore, majority of recent researches have focused on finding an optimum ratio of the filler and the matrix to achieve maximum wear resistance and at the same time, lowest friction coefficient. 17PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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