Reduction in EHL Friction by a DLC Coating

Autor:	Svenja Bachmann, Karsten Stahl, Klaus Michaelis, J. Mayer, Ronny Beilicke, Johann Schnagl, Lars Bobach, Holger Ziegele, Dirk Bartel
Rok vydání:	2015
Předmět:	Work (thermodynamics) Materials science Mechanical Engineering Metallurgy Surfaces and Interfaces Surfaces Coatings and Films Physics::Fluid Dynamics Viscosity Thermal conductivity Mechanics of Materials Thermal Shear stress Composite material Lubricant Reduction (mathematics) Dlc coating
Zdroj:	Tribology Letters. 60
ISSN:	1573-2711 1023-8883
Popis:	This work evaluates the influence of DLC coatings on the frictional behaviour of lubricated line contacts in the fluid friction regime. Experiments on a twin-disc machine showed a significant reduction in friction using DLC coated discs instead of uncoated ones. The experimental results are compared by calculations using a three-dimensional thermal elastohydrodynamic simulation model. According to the calculations, the lower heat conductivity of DLC coatings is the main reason for the reduction in friction. This is because of the higher temperature level in the lubricating gap, which results in a reduction in the effective lubricant viscosity and consequently in reduced frictional shear stress. Lower bulk temperatures of the discs are a further consequence of the low heat conductivity of DLC coatings. The resulting lower temperature at the inlet zone of the contact in the steady-state conditions also leads to larger lubricating gaps and to a further reduction in friction.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::83e8d0ebf63f9dac121646ea1864f3cf https://doi.org/10.1007/s11249-015-0594-2 Zobrazit plný text záznamu Full text from SpringerLink