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Figure 4.11 SEM top view surface images of (a) PTFE/Pyrrolidone-2 and (b) PEEK/PTFE coatings. (c) SEM cross section image of PEEK/PTFE coating and (d) zoom-in of (c) showing large flake-like particles. These structure-induced differences in mechanical properties for the two coatings could be seen by the SEM images in Figure 4.11. In the case of PTFE/Pyrrolidone-2 coating, Figure 4.11(a), we cannot see any crystal or grain structures even under higher magnification. It seems that fine powders were compressed together showing a very smooth top surface of PTFE/Pyrrolidone-2. However, the PEEK/PTFE coating surface, Figure 4.11(b), shows very non-uniform surface which consists of large size of particles, thus resulting in porous structure. The sub surface structure could also be observed from the cross section images in Figure 4.11(c) and 4.11(d) for PEEK/PTFE coating (refer to Figure 4.1(b) for cross section image of PTFE/Pyrrolidone-2 coating). They show flake- 69PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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