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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0.3 0.2 0.1 (a) 100 lb 5% ATSP/PTFE_150 lb COF: 0.052 Temp. (C) COF 150 lb 0.0 0 5 10 15 300 (b) 200 100 Time (min) 5% ATSP/PTFE_150 lb 0 0 5 10 15 Time (min) Figure A.7 In-situ (a) friction coefficient (COF) and (b) near contact temperature (NCT) of 5% ATSP/PTFE coating during 15 min dry-unidirectional testing under 150 lb normal load. On the same coating surface previously tested in Figure A.4 (due to the limited samples provided at the time, and also zero wear even after 60 min testing), higher normal load testing was performed with 668 N (150 lb) in Figure A.7 and 890 N (200 lb) in Figure A.8. Each testing was performed under the same testing conditions as in Figure A.4 (only except the normal load condition) during only 15 min to examine the scuffing resistance of 5% ATSP/PTFE coating. Under 668 N normal load condition in Figure A.7, this coating showed still very stable friction coefficient with even lower value of 0.052 than COF under 445 N normal load condition, 0.077. However, its NCT increased fast up to 200 °C even after 5 min of testing. Under 890 N normal load condition in Figure 148

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