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

作　　者：Yujie GONGYANG Wengen OUYANG Cangyu QU Michael URBAKH Baogang QUAN Ming MA Quanshui ZHENG 

机构地区：[1]Department of Engineering Mechanics,Tsinghua University,Beijing 100084,China [2]Center for Nano and Micro Mechanics,Tsinghua University,Beijing 100084,China [3]School of Chemistry and The Sackler Center for Computational Molecular and Materials Science,Tel Aviv University,Tel Aviv 69978,Israel [4]The Raymond and Beverly Sackler Faculty of Exact Sciences,Tel Aviv University,Tel Aviv 69978,Israel [5]Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [6]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China [7]State Key Laboratory of Tribology,Tsinghua University,Beijing 100084,China [8]Department of Mechanical Engineering,Tsinghua University,Beijing 100084,China

出　　处：《Friction》2020年第2期462-470,共9页摩擦（英文版）

基　　金：Wengen Ouyang acknowledges the financial support from a fellowship program for outstanding postdoctoral researchers from China and India in Israeli Universites.Ming Ma wishes to acknowledge the financial support by Thousand Young Talents Program and the NSFC grant Nos.11632009,11772168,and 11890673;Quanshui Zheng wishes to acknowledge the financial support by the NSFC grant No.11890671.

摘　　要：One of the promising approaches to achieving large scale superlubricity is the use of junctions between existing ultra-flat surface together with superlubric graphite mesas.Here we studied the frictional properties of microscale graphite mesa sliding on the diamond-like carbon,a commercially available material with a ultra-flat surface.The interface is composed of a single crystalline graphene and a diamond-like carbon surface with roughness less than I nm.Using 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 heating.These observations indicate that the edges have a significant contribution to the friction.Our 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 

分 类 号：TQ127.11[化学工程—无机化工]