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1.5 1.0 0.5 0.0 -0.5 -1.0 -1.5 0 1.5 1.0 0.5 0.0 -0.5 -1.0 -1.5 0 (a) 1.5 PTFE/Pyrrolidone (b) 1.0 0.5 0.0 -0.5 -1.0 -1.5 1.5 1.0 0.5 0.0 -0.5 -1.0 -1.5 PTFE/Pyrrolidone Rq: 178 nm Distance (μm) (c) 1000 PEEK/PTFE Selective area Rq: 93 nm 650 700 750 800 850 Rq: 288 nm Distance (μm) 1000 500 Height (μm) Height (μm) Height (μm) Height (μm) 500 500 550 600 650 700 Distance (μm) Figure 6.13 Profilometric measurements of 6.3 mm pin surfaces after fretting experiments with (a), (b) PTFE/Pyrrolidone and (c), (d) PEEK/PTFE coatings. 6.3.2.3 Morphology of transfer films The roughness of the pin surfaces was measured using a stylus profilometer to quantitatively examine the polymer transfer films. Figure 6.13(a) shows a line scan on the pin surface after it was tested against PTFE/Pyrrolidone coating. The root-mean- square (RMS or Rq) roughness is 178 nm, which is 50 % lower than the roughness of original pin surface, 347 nm (using the same length scan size). A selected area from 650 μm to 850 μm shows significantly smoothed pin surface with an RMS roughness of 93 nm, as seen in Figure 6.13(b). This likely resulted from the filling effect of the transferred material onto the asperity crevices. In the case of PEEK/PTFE coating shown 123 Distance (μm) (d) PEEK/PTFEPDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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