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deformations of each coating surface, as seen in Figure 5.2(b). Along with the displacement plots, the in-situ lateral and normal forces are recorded, thus resulting in the in-situ friction coefficient of the scratched surface. 22 Pre-Scan Scratch Post-Scan Pre-profile scan (a) -6 -200 Post-profile scan Scratch Post-Scan 0 -2 -4 Scratch direction -100 Scratch Distance (μm) 0 -2 -4 Depth (μm) Depth (μm) 0 -6 -200 -100 0 Scratch Distance (μm) Figure 5.2 Representative ramp-loading microscratch curves showing (a) low load pre-scratch scan (black), in-situ scratch displacement (red), and low load post-scratch scan (green); (b) normalized scratch and post-scratch scans. When performing scratch testing, it is critical that the test parameters of scratch velocity and loading rate are kept consistent throughout the samples being compared. For all samples in this work, the scratch velocity and the loading rate were kept constant at 7.5 μm/s and 1 mN/s, respectively. A constant normal load of 200 μN was applied for both the pre- and post-scratch scans. Each sample was scratched 4 times for each maximum load (three different maximum loads of 10, 20, and 30 mN, thus resulting in 12 scratches for each sample) to ensure repeatability and establish the scatter in the results. The tip used for the scratch tests was a 60° conical tip with a tip radius of 4.3 μm as seen in Figure 5.3. 83 (b)PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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