Titel “Ultralow” Sliding Wear PTFE Nanocomposites with Functionalized Graphene
Autor E. Padenko, L. J. van Rooyen, B. Wetzel and J. Karger-Kocsis
Infos zum Autor Institut für Verbundwerkstoffe GmbH

Technische Universität Kaiserslautern

Erwin-Schrödinger-Str. 58

67663 Kaiserslautern

Dipl.-Wirtsch.-Ing Eugen Padenko

Tel.: +49 (0) 631-2017-381

E-Mail: eugen.padenko@ivw.uni-kl.de

Dr.-Ing. Bernd Wetzel

Tel.: +49 (0) 631-2017-119

E-Mail: bernd.wetzel@ivw.uni-kl.de

Prof. Dr. h.c. Karger-Kocsis József

Budapest University of Technology and Economics

Tel.: 06-1-463-249

E-mail: karger@pt.bme.hu

Louis van Rooyen

Applied Chemistry, South African Nuclear

Energy Corporation SOC Limited, Pretoria, South Africa

Tel: +27-12-305-6123

Email: louis.vanrooyen@necsa.co.za
Inhalt Zusammenfassung

The dry friction and sliding wear behavior of sintered polytetrafluoroethylene con¬taining various amounts of functionalized graphene were studied in this work. Gra¬phene was incorporated in an amount of 0, 0.25, 0.75, 1, 2 and 4 vol.%, respectively. Sliding wear tests were performed in ring-on-plate test rig under ambient temperature setting, 1 m/s sliding speed and 1 MPa contact pressure. The dynamic coefficient of friction and specific wear rate were determined. Very low coefficients of friction (0.12—0.14) were measured for polytetrafluoroethylene containing 2 or 4 vol.% graphene, which was attributed to the formation of a tribofilm on the countersurface. The spe¬cific wear rate went through a maximum at 0.75 vol.% graphene. Ultralow wear rates in the range of 10-6mm3/(Nm) were measured for the polytetrafluoroethylene nano¬composites with 2 and 4 vol.% graphene. This was reasoned by the formation of a robust tribofilm, the development was verified by scanning electron microscopy by inspecting the worn surface of polytetrafluoroethylene nanocomposites and that of the steel ring of the ring(metal)-on-plate(polytetrafluoroethylene) test rig. Fourier transform infrared spectroscopic results confirmed the formation of carboxyl groups in the tribofilm. They were supposed to react with the func-tional groups of graphene and to create complexes with the metal countersurface ensuring a tribofilm with high adhesion and cohesion strengths.
Datum 2016