Effect of substrate material on the tribological performance of PTFE-based polymeric coatings in a CO2environment Conference Paper uri icon


  • This work reports on the tribological performance of three commercially available PTFE-based coatings (Dupont® 958-414, Dupont® 958-303 and Whitford Xylan® 1052) deposited onto engineered disks made out of three different commonly used materials. Controlled oscillatory experiments were conducted to simulate the operating conditions of piston-type air conditioning compressors in a CO2refrigerant environment. It was found that the substrate played a major role since failure occurred only with the Al390-T6 substrate and Whitford Xylan® was found to improve the scuffing performance of Al390-T6. The tribological performance was found to improve with increasing CO2pressure since a thicker patchy PTFE transfer layer was formed at the interface. XPS analysis showed that metal fluorides could have a beneficial role on the tribological performance of the coatings.

author list (cited authors)

  • Dascalescu, D., Polychronopoulou, K., & Polycarpou, A. A.

publication date

  • December 2009