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5.2.3 Scratch measurements The PTFE/Pyrrolidone-2, PEEK/PTFE and the two ATSP-based coatings that were used for the tribological tests were also subjected to microscratch testing using a TI- TM TM (Hysitron, Inc.) equipped with a 3D OmniProbe These tests were performed in order to quantitatively characterize the elastic recovery behavior of polymer surfaces which was though to be closely correlated to their frictional performances. The utilized machine uses piezoresistive loading and capacitive sensing and is capable of higher load instrumented scratch experiments, with a maximum lateral force of 5 N and a maximum normal force of 2.7 N. The maximum range of lateral and normal displacements is 150 mm and 100 μm, respectively. Figure 5.2 depicts typical ramp-loading scratch experiments that were used for characterizing the coating’s. Pre- and post-scratch scans of the surface topography were also performed due to the viscoelastic behavior and the relatively high hardness of the coatings. Therefore, each scratch experiment consists of three steps: (1) a pre-scratch scan to measure the topography of the original surface to be scratched, (2) an actual ramp loading scratch, and (3) a post-scratch scan to measure the residual deformation of the scratched surface. All three steps were performed at the exact same location. At the beginning and end of each step, a pre- and a post-profile scan, which is about 12 % of the scratch length, is performed to correct the alignment of the data, as shown in Figure 5.2(a). After the completion of a scratch test, the scratch profile (red line) and the residual profile (green line) are normalized based on the reference original surface (black line) to precisely quantify the true depth of scratch as well as the elastic and plastic 950 TriboIndenter (Hysitron, Inc.). 82PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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