Tribological behaviour of laser textured Ti6Al4V alloy coated with MoS2 and graphene. (December 2018)

• Record Type: Journal Article
• Authors: Arenas, M.A.; Ahuir-Torres, J.I.; García, I.; Carvajal, H.; de Damborenea, J.
• Is Part Of: Tribology international. Volume 128(2018)
• Page Start: 240
• Page End: 247
• Publication Date: 2018-12
• Subjects: Laser surface texturing -- Graphene -- Molybdenum disulphide -- Ti6Al4V; Tribology -- Periodicals; 621.89
• DOI: 10.1016/j.triboint.2018.07.031
• Languages: English
• ISSNs: 0301-679X

Abstract

Abstract: Ti-6Al-4V alloy was laser textured with cross groove patterns and then coated with graphene or MoS2, evaluating its tribological behaviour. The samples were textured by a solid state Nd:Vanadate (Nd:YVO4) laser, making crossed grooves with two different crossing angles, 45°and 60°, shaping a rhombus-like pattern. The percentage of surface area textured was 18, 40 and 64%. Solid lubricants were deposited by the cloth burnishing technique. Bidirectional sliding wear tests were performed to evaluate the tribological behaviour of the alloy. Lubricant working lifetimes were longer on textured and coated surfaces than on polished surfaces. Graphene presented longer lifetime than the MoS2 for 18 and 40% of textured density but rather similar for the 64%. Graphical abstract: Highlights: Picoseconds laser system allows texturing crossed grooves patterns on Ti6Al4V. Textured and non-textured alloy without lubricant shown poor tribological behaviour. Crossed grooves act as lubricant reservoir, releasing during the friction process. Tribological behaviour depends on crossing angle of patterns and % of textured area. Lifetime of graphene is higher than MoS2 for texturing ≤ 40% but similar for 64%.