Friction properties of micro/nanogroove patterns in lubricating conditions

• Published in: Tribology international Vol. 151; p. 106428
• Main Authors: Ando, Yasuhisa, Sumiya, Takuro
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.11.2020; Elsevier BV
• Subjects: Coefficient of friction; Friction; Friction coefficient; Hexadecane; Layouts; Liquid lubrication; Low speed; Lubricating properties; Lubrication; Mechanical properties; Nanogroove; Nanostripe; Single crystals; Surface texturing; Texturing; Top-down nanofabrication; Tribology; Viscous resistance; Top-down nanofabrication; Friction coefficient; Nanostripe; Viscous resistance; Surface texturing; Liquid lubrication; Nanogroove; Hexadecane
• ISSN: 0301-679X; 1879-2464
• DOI: 10.1016/j.triboint.2020.106428

Tribological properties can be improved by surface texturing; however, most of the conducted studies used microscale patterns. This study evaluated the lubrication properties of four different micro/nanogroove layouts (i.e., one straight layout and three different types of V-shaped layouts) created using the nanostripe fabrication technology. For each layout, microgrooves were arrayed at a pitch of 4 μm or 6 μm, and nanogrooves were formed on the ridge between these microgrooves. Friction tests were conducted at different loads and speeds using a single-crystal SiC disk as the counter specimen. We showed that patterns with 6 μm pitch microgrooves had a lower friction coefficient than those with 4 μm pitch microgrooves. The layouts with a higher ratio of nanogrooved area obtained a lower friction coefficient in high load and low speed conditions that are considered as boundary or mixed lubrication regimes. •V-shaped micro/nanogroove layouts were created on Si substrateby top-down fabrication.•Microgrooves reduced friction coefficient at higher sliding speed and lower load.•Higher ratios of nanogrooved area obtained lower friction coefficients.•Friction coefficient was lowest for a V-shaped layout with deeper microgrooves.