Friction reduction and anti-wear mechanisms of surface-textured graphite under water lubrication

IF 5.3 1区工程技术 Q1 ENGINEERING, MECHANICAL

Wear Pub Date : 2024-11-20 DOI:10.1016/j.wear.2024.205665

Cheng Zheng , Yulei Yang , Shuo Cheng , Wei Wang , Kun Liu , Jimin Xu

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Abstract

In this study, tribological behaviors of surface-textured graphite samples under water lubrication are analyzed by experiments and molecular dynamics simulations to reveal the underlying friction and anti-wear mechanism. Circular dimple-type textures are chosen for investigations. Ball-on-disc frictional tests are performed to investigate the influence of texture spacing on friction coefficient and wear degree. The sample with a texture spacing of 200 μm possesses the lowest friction coefficients and the smallest cross-sectional area of the wear mark. The roles of support strength of solid part among textures, water wettability and water film in determining the water-lubricated tribological behaviors are analyzed in detail. The water molecules trapped by the dimple-type textures can produce additional hydrostatic pressure, which is the most crucial factor. The results of this study can guide the design of water-lubricated graphite components with surface textures, such as mechanical seals and graphite bearings in nuclear main pumps and ships.

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水润滑条件下表面纹理石墨的减摩和抗磨机理

本研究通过实验和分子动力学模拟分析了表面纹理石墨样品在水润滑条件下的摩擦学行为，以揭示其背后的摩擦和抗磨机理。研究选择了圆形酒窝型纹理。通过球盘摩擦试验来研究纹理间距对摩擦系数和磨损程度的影响。纹理间距为 200 μm 的样品摩擦系数最小，磨损痕迹的横截面积最小。详细分析了纹理间固体部分的支撑强度、水润湿性和水膜在决定水润滑摩擦学行为中的作用。被凹陷纹理截留的水分子会产生额外的静水压力，这是最关键的因素。这项研究的结果可以指导具有表面纹理的水润滑石墨部件的设计，例如核主泵和船舶中的机械密封和石墨轴承。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Wear 工程技术-材料科学：综合

CiteScore

8.80

自引率

8.00%

发文量

280

审稿时长

47 days

期刊介绍： Wear journal is dedicated to the advancement of basic and applied knowledge concerning the nature of wear of materials. Broadly, topics of interest range from development of fundamental understanding of the mechanisms of wear to innovative solutions to practical engineering problems. Authors of experimental studies are expected to comment on the repeatability of the data, and whenever possible, conduct multiple measurements under similar testing conditions. Further, Wear embraces the highest standards of professional ethics, and the detection of matching content, either in written or graphical form, from other publications by the current authors or by others, may result in rejection.