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APPENDIX: PRELIMINARY RESULTS FOR TRIBOLOGICAL CHARACTERIZATION OF ATSP-BASED COATINGS A.1 Introduction Aromatic Thermosetting Copolyesters (ATSP) system was invented by material science Professor J. Economy (UIUC), and newly founded coating development company, ATSP Innovations has recently acquired an exclusive license for the intellectual property to commercialize this technology. Currently, there has been a collaboration work with this company to apply ATSP blended with various functional additives (e.g. PTFE, MoS2, graphite, PI) as a coating and test them under realistic compressor-specific conditions. Based on the recent work on bulk ATSP and ATSP/PTFE blends (Zhang et al., 2008(1) and Demas et al., 2008), it was found that pure bulk ATSP experienced “zero wear” but somewhat high friction while ATSP/PTFE blends exhibited excellent tribological performance by combining the harder ATSP “rock-like” structures with the low friction properties of PTFE. Also, some preliminary ATSP coating work has been done under only very mild testing conditions in Zhang et al. (2010). In the case of pure ATSP coatings, significantly high friction coefficient (around 1.0) and wear rate (1.62 × -4 3 10 mm /N·m) were observed. However, the ATSP coating blended with fluoroadditive ® powder lubricant (Zonyl TE-5069AN) showed significantly reduced frictioin coefficient -7 3 (around 0.2) and wear rate (7.36 × 10 mm /N·m). To directly compare the improved tribological performance of ATSP/Fluoroadditive coatings with commercially available PTFE-based coatings, PTFE/Pyrrolidone-1 coating was tested under the exact same conditions, and its friction coefficient was similar to that of ATSP/Fluoroadditive coating, 141PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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