Effect of Counterparts and Applied Load on the Tribological Behavior of the Graphene–Nickel Matrix Self-Lubricating Composite  

作　　者：Xiangyu GE Zhiyuan CHAI Qiuyu SHI Jinjin LI Jiawei TANG Yanfei LIU Wenzhong WANG 

机构地区：[1]School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China [2]State Grid Smart Grid Research Institute Co.,Ltd.,Beijing 102209,China [3]State Key Laboratory of Tribology,Tsinghua University,Beijing 100084,China

出　　处：《Friction》2023年第2期187-200,共14页摩擦（英文版）

基　　金：the National Key R&D Program of China(Nos.2020YFB2007300,2020YFA0711003);the Foundation from State Key Laboratory of Tribology(No.SKLTKF20B01);Beijing Institute of Technology Research Fund Program for Young Scholars,the Fund of Key Laboratory of Advanced Materials of Ministry of Education(No.ADV21-4);the National Natural Science Foundation of China(No.52005287).

摘　　要：Graphene-oxide (GO) has been recognized as an excellent lubrication material owing to its two-dimensional structure and weak interlayer interactions. However, the functional groups of GO that can contribute to anti-friction, anti-wear, and superlubricity are yet to be elucidated. Hence, further improvement in GO-family materials in tribology and superlubricity fields is impeded. In this study, macroscale superlubricity with a coefficient of friction of less than 0.01 is achieved by exploiting the high adhesive force between amino groups within aminated GO (GO–NH_(2)) nanosheets and SiO_(2). It was observed that GO–NH_(2) nanosheets form a robust adsorption layer on the worn surfaces owing to the high adsorption of amino groups. This robust GO–NH_(2) adsorption layer not only protects the contact surfaces and contributes to low wear, but also causes the shearing plane to transform constantly from solid asperities (high friction) into GO–NH_(2) interlayers (weak interlayer interactions), resulting in superlubricity. A SiO_(2)-containing boundary layer formed by tribochemical reactions and a liquid film are conducive to low friction. Such macroscale liquid superlubricity provides further insights into the effect of functional groups within functionalized GO materials and a basis for designing functionalized GO materials with excellent tribological performances.

关 键 词：functionalized graphene-oxide aminated graphene-oxide SUPERLUBRICITY anti-friction and anti-wear 

分 类 号：O647.11[理学—物理化学]