Achieving ultrafast superlubricity with layered double hydroxides  

作　　者：Kunpeng Wang Yuhong Liu Hongdong Wang Jianbin Luo 

机构地区：[1]State Key Laboratory of Tribology,Tsinghua University,Beijing 100084,China [2]School of Mechatronic Engineering,Shanghai University,Shanghai 200444,China

出　　处：《Nano Research》2023年第5期6940-6950,共11页纳米研究（英文版）

基　　金：the National Natural Science Foundation of China(Nos.52105194,52275203,51875303,and 51905294);the China Postdoctoral Science Special Funding Project(No.2022T150353);the Tribology Science Fund of State Key Laboratory of Tribology in Advanced Equipment(No.SKLTKF20A01).

摘　　要：Layered double hydroxides(LDHs)have the potential to be superlubricated materials due to their strong adsorption effect and weak internal interaction.However,obtaining stable superlubricity during the ultrafast time(<10 s)is still a challenge.Here,we demonstrated macroscale superlubricity based on LDHs of multiple metal ions at high surface roughness,achieving superlow friction coefficients(0.006)and ultrafast wearing-in time(<7 s),which mainly originated from tribochemical reactions and the formation of nanostructured adsorption layers.Through cross-sectional analysis and density functional theory,we revealed the properties of the protective tribofilm to achieve ultrafast superlubricity.LDHs strongly adsorbed on the surface of the bearing steel,the sliding interface transformed into a heterogeneous interface between the polytetrafluoroethylene and LDH,leading to macroscale superlubricity.These findings demonstrate that tribochemical treatment of surfaces produces tribofilm that effectively reduces wearing-in time and promotes ultralow friction.

关 键 词：SUPERLUBRICITY ultrafast wearing-in time bearing steel LDH nanosheets sliding barrier 

分 类 号：O64[理学—物理化学]