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Figure A.2 (a) Optical image of 5% ATSP/PTFE coating surface after 30 min dry-unidirectional testing in Figure A.1, and (b) its zoomed-in image showing the wear track. Figure A.2 shows the coating surface and wear track after 30 min dry- unidirectional testing. Initially, the coating surface was relatively rough compared to other commercially available PTFE- and PEEK-based coatings due to PTFE powders which were not well distributed in this Phase-I coating system. Interestingly, this coating showed almost zero wear (material removal) without any wear debris observed, and only mild burnishing was seen in Figure A.2(b). The cross-section line profile of this wear track was measured using a stylus profilometer as seen in Figure A.3. As already seen in the optical images, Figure A.3 showed significantly rough surface of 5% ATSP/PTFE coating with many tall asperities of about 20 μm height. It was observed that only top parts of these tall asperities were removed by the sliding without any severe wear of sub-surface coating layers, thus resulting in almost zero wear in the optical images. Now, therefore, longer duration (60 min) testing was performed for this coating system to see if this superior wear performance is its actual steady-state property. 144PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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