Regensburg 2007 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 39: Mechanical properties I
MM 39.1: Talk
Thursday, March 29, 2007, 16:15–16:30, H6
Tribological performance of WC/C coatings on rough substrates — •Mikhail Kosinskiy1, Yonghe Liu1, Maik Gubisch2, Lothar Spiess2, and Juergen A. Schaefer1 — 1Institut für Physik und Zentrum für Mikro- und Nanotechnologien, Technische Universität Ilmenau, Germany — 2Institut für Werkstofftechnik und Zentrum für Mikro- und Nanotechnologien, Technische Universität Ilmenau, Germany
The available measurements on the tribological behavior of WC/C multilayer coatings are mainly performed on atomically smooth Si surfaces. In this work, we study the influence of surface roughness on the friction and wear of WC/C coatings. Chromium steel samples cut from linear bearing were polished to surface roughness (Ra) in the range of 3 nm ~ 700 nm, and subsequently deposited with 700 nm thick WC/C coatings. The measurements were performed by using a reciprocating microtribometer at different normal load and velocity in normal atmospheric conditions. As a comparison, bare samples (without coating) were also tested. We find a roughness, on which the coefficient of friction (COF) is minimum for bare samples, but is maximum for coated samples. The reduction of COF by applying the coating is ~200%.