| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 5366490 | Applied Surface Science | 2012 | 6 Pages |
In this paper, titanium doped diamond-like carbon (Ti-DLC) coatings were prepared onto AISI 52100 steel substrates using medium frequency magnetic sputtering process, and were analyzed using the Raman and transmission electron microscope (TEM). Two kinds of 1,3-dialkyl imidazolium ionic liquids (ILs) were synthesized and evaluated as lubricants for Ti-DLC/steel contacts at room temperature, and PFPE as comparison lubricant. The tribological properties of the ILs were investigated using a ball-on-disk type UMT reciprocating friction tester. The results indicated that the ILs have excellent friction-reducing properties, the friction coefficient kept at a relatively stable value of 0.07-0.06, which was reduced approximately by 47% compared with perfluoropolyether (PFPE). The worn surfaces of Ti-DLC coatings were observed and analyzed using a MICROXAM-3D non-contact surface profiler, scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS). The Ti-DLC coatings using ionic liquids lubricating systems are considered as potential lubricating system in vacuum and space moving friction pairs.
⺠Ti-DLC coatings on AISI 52100 steel have a very fine structure. ⺠Ionic liquids reduce the friction and wear of Ti-DLC coatings. ⺠Ionic liquids are superior to PFPE under Ti-DLC coatings against steel conditions. ⺠Tribochemical films and chemical adsorption films were formed on the worn surface.
