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O: Fachverband Oberflächenphysik

O 85: Poster: Tribology and Misc.

O 85.2: Poster

Wednesday, March 14, 2018, 18:15–20:30, Poster A

Sonolubrication in Amorphous and Crystalline Materials — •Victor Pfahl¹, Chengfu Ma^2,1, Walter Arnold^3,1, and Konrad Samwer¹ — ¹I. Physikalisches Institut, Universität Göttingen — ²Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China — ³Department of Materials and Materials Technology, Saarland University

We studied sonolubricity, a phenomenon reducing friction between two sliding surfaces by ultrasound. Friction force measurements were performed in an atomic force microscope (AFM) when the tip-surface contact was excited to out-of-plane oscillations oscillations by a transducer or the built-in piezoelectric element in the cantilever holder.

Experiments were carried out near or at the first cantilever contact-resonance. We studied friction on crystalline and amorphous Pd_77.5Cu₆Si_16.5 ribbons, on a silicon wafer at room temperature, and on a La_0.6Sr_0.4MnO₃ thin film at different temperatures. Measurements were carried out varying the cantilever amplitude, the ultrasonic frequency, and the normal static load.

All experimental results display a universal behavior, which can be explained by the non-linearity of the force-distance curve between sample and tip due to the local interaction potential. An analytic function is found, which describes the reduction of friction as a function of the cantilever amplitude.

We would like to thank the DFG for funding CRC 1073 Project A1. Chengfu Ma gratefully acknowledges the China Scholarship Council for support.