A molecular dynamics study on water lubrication of PTFE sliding against copper

被引：51

作者：

Song, Jingfu ^{[1
]}

Zhao, Gai ^{[2
,3
]}

机构：

[1] Nanjing Univ Aeronaut & Astronaut, Coll Mat & Sci Technol, Nanjing 210016, Jiangsu, Peoples R China

[2] Nanjing Univ Aeronaut & Astronaut, State Key Lab Mech & Control Mech Struct, Nanjing 210016, Jiangsu, Peoples R China

[3] Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Gansu, Peoples R China

来源：

TRIBOLOGY INTERNATIONAL | 2019年 / 136卷

关键词：

Polymer; Water lubrication; Dry friction; Molecular dynamics simulation; TRIBOLOGICAL PROPERTIES; WEAR PROPERTIES; COMPOSITES; FRICTION; BEHAVIOR; STEEL;

D O I：

10.1016/j.triboint.2019.03.070

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The tribological models of the PTFE sliding against Copper (Cu) layer under dry friction and water lubrication were developed by a molecular dynamics (MD) simulation to examine the friction coefficient and wear process from an atomic view, respectively. The average friction coefficient of PTFE in the steady stage decreased from 0.189 to 0.064 after water lubrication. Water lubrication dramatically reduced the wear of PTFE compared with dry friction. The molecular interactions among PTFE molecules, water molecules and Cu atoms were interpreted by analyzing the variations of the radius distribution function (RDF), relative concentrations and velocity in the thickness direction. The water lubrication mechanisms were discussed by monitoring the potential energy and temperature variations during the process of friction.

引用

页码：234 / 239

页数：6

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