Wall Friction Reduction by an a-C:H:Si Film for Fine Granular Building Materials

Beschreibung

The evaluation of the wall friction angle in the context of granular materials flow is imperative in many industrial settings. Lower wall friction is associated with a decrease of disturbances in granular material flow as well as with reduced power consumption in drives. A material that has shown promise in decreasing powder wall friction is a-C:H:Si, belonging to the diamond like carbon (DLC) materials, which are known for their exceptional tribological properties when used to minimize friction between sliding and rotating parts. Yet, the frictional behavior of fine granular material on a-C:H:Si films remains relatively unexplored. In this study the powder wall friction of various fine granular materials typically used in the building industry, such as cements, hydrated lime, plaster, sand, or mixtures, on an a-C:H:Si film was investigated. The analysis was conducted using a Schulze ring shear tester, comparing the results with measured wall friction on mild steel S235JR and on Ultra-High Molecular Weight Polyethylene (UHMWPE). The shear test results indicated a noticeable reduction in wall friction on the a-C:H:Si film, with wall friction angles reduced by up to more than 10°. The reduction in wall friction was most prominent at higher wall normal stresses. To obtain a deeper understanding of the correlation between the reduction in wall friction and the particle size and size distribution of the granular material, these factors were further investigated.

Zeitraum	14 Jän. 2025
Ereignistitel	13th International Conference on Nano and Materials Science
Veranstaltungstyp	Konferenz
Ort	Atlanta, USA/Vereinigte Staaten, GeorgiaAuf Karte anzeigen
Bekanntheitsgrad	International