Topography and tribological behaviour of lubricating greases – an experimental study

Kuhn, E. C.; Holweger, Walter

doi:10.1108/00368790410515344

Cited by 2 publications

(2 citation statements)

References 4 publications

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“…Powder lubrication tests were performed at velocities of 5 mm/s, 12.5 mm/s and 20 mm/s. The experimental conditions for slip velocities and loads are refer to references [7], [9], [11] and [13].The pressures are about 2.26MPa and 4.52MPa based on the test parameters which is appropriate for contact interfaces of powder lubrication. All experiments were conducted in air at room temperature ( about 20℃) and ambient relative humidity is about 40%.…”

Section: Fig2 Specimen Interface Of the Original Graphite Coating Layermentioning

confidence: 99%

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In-situ Observation and Discrete Element Simulation of Powder Lubrication Mechanism at Different Slip Velocities and Loads

Kong,

Zhang,

Wang

et al. 2024

Preprint

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In this paper, the powder lubrication layer composed of graphite particles was prepared by spray method and the effect of velocity and load on the friction characteristics of graphite layer was investigated using a friction tester that can observe the friction interface in real time. Subsequently, 3D surface profilometer, SEM, and EDS were used to characterize the morphology and elements of worn surfaces. The friction results show that at low slip velocity (5 mm/s) and lower load (4N), only partial powder lubrication layer was formed in contact interface, the surface of the graphite layer exhibited obvious peeling characteristics. When slip velocity is too fast (20 mm/s), the dissipation of powder layer increases and the metal substrate is exposed, while there are serious abrasions and chip exfoliation. At the velocity of 12.5 mm/s, the graphite layer shows the best lubrication effect, and the worn surface is more flat compared with that of applying other velocities. The coordination number, the total number of force chains and high stress particles inside the graphite layer during friction process were calculated using the discrete element method at different velocities. With heavy load (8N) that dense force chains are formed at the interface. But the powder layer is easily damaged throughout that the substrate contact directly, thus the powder layer of interface is unevenness extremely. Trying to provide a reasonable explanation for the inherent mechanism of the influence of velocity and load on the lubrication effect of the powder layer.

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Section: Fig2 Specimen Interface Of the Original Graphite Coating Layermentioning

confidence: 99%

“…The real contact area ratio is an important parameter to characterize the abrasion status of specimens, and is calculated by greyscale and binary of MATLAB [13] . Fig.…”

Section: Real Contact Area Ratiomentioning

confidence: 99%

In-situ Observation and Discrete Element Simulation of Powder Lubrication Mechanism at Different Slip Velocities and Loads

Kong,

Zhang,

Wang

et al. 2024

Preprint

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Application of a Thermodynamic Concept for the Analysis of Structural Degradation of Soap Thickened Lubricating Greases

Kuhn

2018

Lubricants

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Lubricating greases are special lubricants with a wide range of application. The tribologically stressed grease is used as tribological system and finally modeled as an open thermodynamic system. This study investigated the phenomenon of self-optimization and applied to the process of shearing a grease. The conditions for self-optimization and the consequences of created dissipative structures are investigated according to the interpreted literature.

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Topography and tribological behaviour of lubricating greases – an experimental study

Cited by 2 publications

References 4 publications

In-situ Observation and Discrete Element Simulation of Powder Lubrication Mechanism at Different Slip Velocities and Loads

In-situ Observation and Discrete Element Simulation of Powder Lubrication Mechanism at Different Slip Velocities and Loads

Application of a Thermodynamic Concept for the Analysis of Structural Degradation of Soap Thickened Lubricating Greases

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