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Figure 4.1(b) shows a representative cross-section of a coating system examined through SEM. The thickness of the PTFE/Pyrrolidone-2 coating shown in Figure 4.1(b) is 25 to 30 μm. The measured thicknesses of the other coatings were similar, in the range of 30 ± 10 μm, as summarized in Table 4.1 along with additional coating properties. These values are thicker than typical hard coatings, such as diamond-like-carbon (DLC) and WC/C (2.5 μm (Solzak and Polycarpou, 2010)). The roughness of each coating was measured using a stylus profilometer (Tencor P-15TM) with 4 mm scan distance and 1 data/μm sampling rate. Figure 4.2 shows the representative surface profile (without any filtering) of each coating tested in this work. Root-mean-square (RMS) roughness values in Table 4.1 were calculated after band-pass filtering of these profiles with 2 μm short wavelength cutoff and 500 μm long wavelength cutoff. The average surface roughness values of the coatings were in the range of 0.6 μm to 2.3 μm, which was lower than the roughness after grit-blasting and before coating deposition, as expected. Interestingly, the coating roughness values vary significantly, likely due to the powder/particle size used in each coating. Table 4.1 Physical properties of the polymeric coatings used in this work. Coating PTFE/Pyrrolidone-1 PTFE/Pyrrolidone-2 Resin/PTFE/MoS2 PTFE/MoS2 Fluorocarbon PEEK/PTFE PEEK/Ceramic Curing In-use Temp. (°C) Temp. (°C) 250 ~ 340 260 255 200 220 ~ 345 260 316 260 316 232 400 260 400 260 Color Matte black Dark green Glossy black Black Navy black Dark gray Beige-tan Thickn- ess (μm) 26±5 23±5 20±5 20±5 25±5 40±5 38±5 RMS roughness [Std] (μm) 2.28 [0.09] 0.61 [0.08] 1.71 [0.07] 1.14 [0.05] 1.53 [0.15] 1.00 [0.03] 0.92 [0.05] 52PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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