Journal
TRIBOLOGY INTERNATIONAL
Volume 188, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.triboint.2023.108838
Keywords
Gallium-based liquid metal; Boundary lubrication; Mixed Lubrication; Stribeck curve
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Through the study of the stribeck curve, static friction, and a series of fixed-speed friction tests for steel self-mated pairs under gallium lubrication, the lubrication regimes and transition laws are revealed. In the sliding speed ranging from 10-8 to 1.4 m/s and the normal load ranging from 2 to 20 N, gallium can only provide boundary and mixed lubrication. Uniformly distributed or island-like distributed gallium-rich films are formed under boundary or mixed lubrication regimes, respectively. The different formation mechanisms are revealed. The failure of the gallium-rich film is mainly related to the average contact stress of the frictional interfaces.
Gallium-based liquid metal is a novel lubricant for high-end equipment due to its low friction coefficient and excellent load-carrying capacity. In this work, the stribeck curve, static friction and a series of fixed-speed friction tests for steel self-mated pairs under gallium lubrication are conducted to reveal the lubrication regimes and transition laws. In the sliding speed ranging from 10-8 to 1.4 m/s and the normal load ranging from 2 to 20 N, gallium can only provide boundary and mixed lubrication. Uniformly distributed or island-like distributed gallium-rich films are formed under boundary or mixed lubrication regimes, respectively. The different forma-tion mechanisms are revealed. The failure of the gallium-rich film is mainly related to the average contact stress of the frictional interfaces.
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