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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PTFE/MoS2 showed the highest wear resistance, with an average wear depth of 17 μm. PEEK-based coatings exhibited higher wear, around 40 μm, and in the case of PEEK/Ceramic coating, over 45 μm of wear, which corresponded to the total coating thickness. Nevertheless, none of these coatings exhibited catastrophic failure during the test duration, due to the lubricity effect of the wear debris trapped inside the wear tracks. The wear rate for each coating was calculated using the method discussed in Figure 3.3, and plotted on the y-axis along with the friction coefficient values on the x-axis, shown in Figure 3.6. 40 40 00 -40 -40 -80 -80 0 2 4 6 8 10 0 2 4 6 8 10 (a) Fluorocarbon (b) PTFE/MoS 2 (c) PEEK/Ceramic (d) PEEK/PTFE 40 Scan Length (mm) Scan Length (mm) 40 00 -40 -40 -80 -80 0 2 4 6 8 10 0 2 4 6 8 10 Scan Length (mm) Scan Length (mm) Figure 3.5 Typical profilometric wear track measurements of (a) Fluorocarbon, (b) PTFE/MoS2, (c) PEEK/Ceramic, and (d) PEEK/PTFE coatings after 30 min oscillatory testing. 32 Profile (μm) Profile (μm) Profile (μm) Profile (μm)

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