SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 38: Poster Session III: Tribology: Surfaces and nanostructures I
O 38.1: Poster
Dienstag, 2. März 2021, 10:30–12:30, P
Thermal Activation of Nanoscale Wear — Wen Wang1,2, •Dirk Dietzel1, and Andre Schirmeisen1 — 1Institute of Applied Physic, University of Giessen, 35392 Giessen, Germany — 2School of Mechanical Engineering, Southwest Jiaotong University, 610031 Chengdu, China
Atomic force microscopy under ultrahigh vacuum conditions was used to study the temperature dependence of nanoscale wear occurring on freshly cleaved NaCl (001) and KBr (001) single crystals during continuous line scanning. Independent of the material, we observe non-monotonous wear-rates as a function of temperature, where a distinct transition between two regimes can be correlated to the onset of quasi-periodic ripple formation at higher temperatures. We find that a thermally activated bond breaking model quantitatively fully describes the wear rates in the low temperature regime and can also be applied to the high temperature regime once the alternating structure of mounds and troughs is accurately considered. Based on this agreement with Arrhenius kinetics over the whole temperature range, also the velocity dependence of the wear rate can be explained, where the amount of wear only depends on the overall scan length but is independent of sliding velocity.