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TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS

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TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS ( tribology-polymeric-coatings-for-aggressive-bearing-applicat )

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materials to the counterface is also initiated at the beginning stages of sliding. In this case, the polymer fragments are sheared by sharp metal asperities of the counterface and interlocked into the crevices and valleys of the pin surface (Bahadur and Schwartz, 2008). Figure 6.11 SEM image of counterface (pin surface) tested in contact with PTFE/Pyrrolidone coating under dry condition showing the initial formation of transfer film. The above-mentioned transfer film mechanism can be seen in the x1500 SEM image of the pin surface (6.3 mm) tested with PTFE/Pyrrolidone under dry condition, Figure 6.11. It clearly shows that the pits, holes and crevices of the surface are filled with darker polymer material (also marked with arrows). These small patches of polymer material that initially form on the counterface, agglomerate with repetitive sliding, due to cohesion between mutually compatible polymer fragments, and thus resulting in continuous and large transfer films, as seen in Figure 6.10(a). With increasing number of 120

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