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was recorded. From the line scan data, the exact wear volume loss of each coating could be precisely determined as described in Figure 3.3. Then, the normalized wear rate for each coating was calculated by dividing the wear volume by the normal load and the total sliding distance. 20 μm 0 -20 -40 ∫R2 R1 x PEEK/Ceramics Wear Volume = L⋅2π L = 1 for unidirectional test, 1/3 for oscillatory test R1 f(x) R2 xf (x)dx 0 4 8 12 Figure 3.3 Typical wear track showing the calculation of the wear volume. 3.3 Results and discussion 3.3.1 Oscillatory testing (piston-type compressors) Representative friction coefficient and near contact temperature measurements of one of the polymeric coatings (PTFE/MoS2) under dry-oscillatory conditions is shown in Figure 3.4. Two different tests are shown, exhibiting similar behavior, thus validating repeatability. The friction coefficient gradually increased for the first 10 min, and then slightly decreased, reaching a steady-state value at 15 min. This friction behavior was explained in Ref. Demas and Polycarpou (2008) by the third-body self-lubricating behavior of the generated wear debris particles. Initially during the running in period and as the coating is worn out, the friction coefficient increases because higher frictional mm 30PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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