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Temperature and velocity dependent friction of a microscale graphite-DLC heterostructure

Friction 2020年第2期8卷 462-470页

作者： yujie gongyang Wengen OUYANG Cangyu QU Michael URBAKH Baogang QUAN Ming MA Quanshui ZHENG Department of Engineering Mechanics Tsinghua UniversityBeijing 100084China Center for Nano and Micro Mechanics Tsinghua UniversityBeijing 100084China School of Chemistry and The Sackler Center for Computational Molecular and Materials Science Tel Aviv UniversityTel Aviv 69978Israel The Raymond and Beverly Sackler Faculty of Exact Sciences Tel Aviv UniversityTel Aviv 69978Israel Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China

One of the promising approaches to achieving large scale superlubricity is the use of junctions between existing ultra-flat surface together with superlubric graphite *** we studied the frictional properties of microscale graphite mesa sliding on the diamond-like carbon,a commercially available material with a ultra-flat *** interface is composed of a single crystalline graphene and a diamond-like carbon surface with roughness less than I *** an integrated approach,which includes Argon plasma irradiation of diamond-like carbon surfaces,X-ray photoelectron spectroscopy analysis and Langmuir adsorption modeling,we found that while the velocity dependence of friction follows a thermally activated sliding mechanism,its temperature dependence is due to the desorption of chemical groups upon *** observations indicate that the edges have a significant contribution to the *** results highlight potential factors affecting this type of emerging friction junctions and provide a novel approach for tuning their friction properties through ion irradiation.

关键词： friction graphite diamond like carbon irradiation desorption

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