纳米颗粒影响润滑膜摩擦特性的分子动力学

doi:10.12068/j.issn.1005-3026.2015.03.025

东北大学学报:自然科学版 ›› 2015, Vol. 36 ›› Issue (3): 415-418.DOI: 10.12068/j.issn.1005-3026.2015.03.025

纳米颗粒影响润滑膜摩擦特性的分子动力学

胡成志，白敏丽，吕继组，王鹏

(大连理工大学能源与动力学院，辽宁大连116024)

收稿日期:2013-10-13 修回日期:2013-10-13 出版日期:2015-03-15 发布日期:2014-11-07
通讯作者: 胡成志
作者简介:胡成志(1988-)，男，山东聊城人，大连理工大学博士研究生; 白敏丽(1962-)，女，辽宁大连人，大连理工大学教授，博士生导师.
基金资助:
国家自然科学基金资助项目(51276031，51476019，51376002).

Molecular Dynamics Simulation of the Effect of Nanoparticles on the Tribological Properties of Lubricant Film

HU Cheng-zhi， BAI Min-li， LYU Ji-zu， WANG Peng

School of Energy and Power Engineering， Dalian University of Technology， Dalian 116024， China.

Received:2013-10-13 Revised:2013-10-13 Online:2015-03-15 Published:2014-11-07
Contact: LYU Ji-zu
About author:-
Supported by:
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摘要/Abstract

摘要： 向润滑油中添加纳米颗粒可以降低摩擦系数，提高承载能力，但其中的物理机制并不完全清晰. 采用分子动力学方法研究了理想摩擦副间纳米流体和基础流体摩擦特性的不同，着重探明纳米颗粒与基础流体的相互作用机制.研究发现在较高的载荷下纳米流体和基础流体均由液态转化成类固体，但纳米流体的相变压力明显高于基础流体；在相变点后，纳米流体表现出了良好的摩擦特性.纳米颗粒增强了润滑膜的承载能力，且在相变点后强化效果更好.最后对纳米颗粒改善润滑摩擦的物理机制做了详细的解释.

关键词: 纳米流体, 分子动力学, 摩擦特性, 相变, 承载能力

Abstract: The lubricant film has excellent load-carrying capacity， anti wear and friction-reducing properties with the addition of nanoparticles， but the physical mechanism is still unclear. Using molecular dynamics simulation， the difference of tribological properties between nanofluid and base fluid was studied when the lubricant film was confined to idealized atomistic surfaces. The interaction between nanoparticles and base fluid was studied. The results indicate that:under high load， liquid-solid transition takes place for both base fluid and nanofluid; the critical pressure of nanofluid phase transition is higher than that of the base fluid. After phase transition， nanofluid shows excellent friction-reducing properties. Nanoparticles can also increase the load-carrying capacity effectively and the enhancement effect is better after phase transition. The mechanisms responsible for the nanofluids friction properties are explained in detail.

Key words: nanofluids, molecular dynamics, tribological properties, phase transition, load-carrying capacity

中图分类号:

TH 117.1

胡成志，白敏丽，吕继组，王鹏. 纳米颗粒影响润滑膜摩擦特性的分子动力学[J]. 东北大学学报:自然科学版, 2015, 36(3): 415-418.

HU Cheng-zhi， BAI Min-li， LYU Ji-zu， WANG Peng. Molecular Dynamics Simulation of the Effect of Nanoparticles on the Tribological Properties of Lubricant Film[J]. Journal of Northeastern University Natural Science, 2015, 36(3): 415-418.

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纳米颗粒影响润滑膜摩擦特性的分子动力学

Molecular Dynamics Simulation of the Effect of Nanoparticles on the Tribological Properties of Lubricant Film

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