SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 4: Tribology: Surfaces and Nanostructures

O 4.4: Vortrag

Montag, 27. März 2023, 11:15–11:30, GER 37

Temperature Dependent Wear Effects on the Nanometer Scale — Jennifer Konrad, •Dirk Dietzel, and Andre Schirmeisen — Institute of Applied Physics, Justus-Liebig University Giessen, 35392 Giessen, Germany

On the nanoscale, the temperature dependence of friction as observed by friction force microscopy is a well-known phenomenon that can often be described by the thermally activated Prandtl Tomlinson Model. Similarly, nanoscale wear is also often anticipated as a thermally activated and shear assisted process, which results in a temperature dependence, where the overall wear rate increases with temperature [1]. However, this behavior can change when the effects of interfacial bond formation and breaking have to be taken into consideration. Surprisingly, lower temperatures can then result in higher wear rates as will be demonstrated by temperature dependent wear experiments performed for different interfaces involving silica and diamond surfaces. This behavior can phenomenologically be explained by considering shear assisted bond formation, which leads to a higher number of interfacial bonds formed at lower temperatures [2]. By straining this larger number of bonds during scanning an increased wear rate at low temperatures is then caused, even if the energy barrier for bond breaking is lower than for the removal of adjacent surface atoms.

[1] W. Wang, D. Dietzel, and A. Schirmeisen, Phys. Rev. Lett. 126, 196101 (2021).

[2] M. Vorholzer et al., Physical Review X 9, 041045 (2019).