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running in, however, halfway through the test it started to increase reaching a value of 0.034 towards the end of the test. Because these tests were performed under changing normal load with time, it is also important to examine the in-situ friction force, which is shown in Figure 6.4. In the case of PTFE/Pyrrolidone, the friction force showed a very slight increase with significant increasing load and thus the apparent reduction in the COF. In the case of PEEK/PTFE the frictional force increases at a faster rate than the normal force, thus the apparent increase in the COF. In both cases, the classic friction “law” stating that there should be a constant COF value violated, which is expected for such polymeric coatings (versus dry metal contacts). (c) PTFE/Pyrrolidone (d) PEEK/PTFE 10 10 00 -10 -10 -20 -20 0 2 4 6 8 10 0 2 4 6 8 10 Scan Distance (mm) Scan Distance (mm) Figure 6.5 Optical images of the worn coating surfaces for (a) PTFE/Pyrrolidone and (b) PEEK/PTFE, and profilometric cross section wear scan measurements for (c) PTFE/Pyrrolidone and (d) PEEK/PTFE (for the experiments shown in Figure 6.3). 111 Height (μm) Height (μm)PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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