Polymer tribology by combining ion-implantation and radionuclide tracing

Heiko Timmers, Laura G. Gladkis, Jacob A. Warner, Aidan P. Byrne, Mariela F. del Grosso, Claudia R. Arbeitman, Gerardo Garcia-Bermudez, Thomas Geruschke and Reiner Vianden

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Volume 268, Issues 11-12, June 2010, Pages 2119-2123

DOI Link: 10.1016/j.nimb.2010.02.019

Abstract:

Radionuclide tracers were ion implanted with three different techniques into the ultra-high molecular weight polyethylene polymer. Tracer nuclei of 7Be were produced with inverse kinematics via the reaction p(7Li,7Be)n and caught by polymer samples at a forward scattering angle with a maximum implantation energy of 16 MeV. For the first time, 97Ru, 100Pd, and, independently, 111In have been used as radionuclide tracers in ultra-high molecular weight polyethylene. 97Ru and 100Pd were recoil-implanted following the fusion evaporation reactions 92Zr(12C,α3n) 97Ru and 92Zr(12C,4n)100Pd with a maximum implantation energy of 8 MeV. 111In ions were produced in an ion source, mass-separated and implanted at 160 keV. The tribology of implanted polymer samples was studied by tracing the radionuclide during mechanical wear. Uni-directional and bi-directional sliding apparatus with stainless steel actuators were used. Results suggest a debris exchange process as the characteristic feature of the wear-in phase. This process can establish the steady state required for a subsequently constant wear rate in agreement with Archard’s equation. The nano-scale implantation of mass-separated 111In appears best suited to the study of non-linear tribological processes during wear-in. Such non-linear processes may be expected to be important in micro- and nanomachines.