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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indentations showed valuable phenomena for each coating, which correlated their structural properties with their tribological behavior. 4.3 Results and discussion 4.3.1 High-load indentation 4.3.1.1 Creep behavior First, the general behavior of the polymeric coatings under high load indentation is discussed before we present the measurements of the specific coating’s mechanical properties. Figure 4.5(a) shows a representative load-displacement curve obtained from a single indentation on PTFE/Pyrrolidone-1 with 20 mN maximum load. Figure 4.5(b) shows the in-situ time varying load and displacement of the probe tip-end. It can be seen that the indenting process was load controlled and its profile was trapezoidal with 5 sec of hold time at the peak load. (b) Load Displacement 20 10 Loading 20 10 (a) Holding Unloading 0.0 -0.4 -0.8 -1.2 -1.6 0 0 0.0 0.4 0.8 1.2 1.6 0 2 4 6 8 Displacement (μm) Figure 4.5 (a) Representative load-displacement curve obtained from a single indentation on PTFE/Pyrrolidone-1, (b) corresponding in-situ load and displacement plots versus time. 58 Time (sec) Load (mN) Load (mN) Displacement (μm)

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