Tribology and Lubricants

Korean Tribology Society (한국트라이볼로지학회)
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Molecular Simulation Study on Influence of Graphene Additives on Water Lubrication

물 윤활에 그래핀 첨가제가 미치는 영향에 대한 분자시뮬레이션 연구

  • Hyun-Joon Kim (Dept. of Precision Mechanical Engineering, Kyungpook National University)
  • 김현준 (경북대학교 정밀기계공학과)
  • Received : 2024.10.24
  • Accepted : 2024.10.31
  • Published : 2024.10.31
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Abstract

This study investigates the lubrication enhancement effects and key mechanisms when graphene is used as an additive under water-lubricated conditions through molecular dynamics simulations. The study models two solid surfaces with a specific roughness values, with water molecules generated using a coarse-grained model placed between them. In cases in which an additive is included, one or three layers of graphene are inserted between the water molecules. The study applies a normal load by moving the two solid surfaces closer together and measures the friction force and atomic stress on the solid surfaces as the upper surface is moved horizontally. The results show that, compared with cases without an additive, both the friction force and friction coefficient are significantly reduced when graphene is added. In addition, the stress on the asperities of the solid surfaces is markedly reduced in the presence of the additive. We confirm that the primary reason for the improved lubrication performance is that graphene, when positioned at the interface, prevents direct contact between the solid surfaces and disperses the contact pressure. Notably, the lubrication performance is found to be nearly independent of the number of graphene layers at the interface.

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Acknowledgement

이 연구는 2023년도 산업통상자원부 및 산업기술평가관리원(KEIT) 연구비 지원에 의한 연구임(No. 20023418)

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