Structure and mechanics of W-DLC coated spur gears

The tribological performance of DLC-coated gears lubricated with biodegradable oil in various pinion/gear material combinations

“…Some other studies about selfmated W-DLC-coated gears using constant contact-loading under long-term operation have reported mechanisms of coating-material removal [20,21]. From their results it can be suggested that W-DLC-coated gears wear out in a noncatastrophic failure mode, which is very important for their safe use in real applications.…”

Investigating atomic structure of thin carbon film under mechanical stress and frictional heat generation

“…To improve the adhesion strength, silicon seed layer (thickness was less than 1 nm) was applied onto the head substrate, and then the carbon overcoat was deposited. A typical carbon density for the head carbon film was 2.5-3.0 g/cm 3 . In general, the ion beam deposition utilizes ion energies higher than in a conventional sputtering technique, which gives stronger ballistic impact effects of carbon ions.…”

“…Due to its superiority of mechanical strength and chemical inertness, DLC film has been widely used as a surface protective coating for many industrial products including magnetic storage devices, spur gears, bearings, razors, automotive pistons and cylinders, and biomechanical structures [1][2][3][4][5][6][7][8]. It was reported that a metal containing DLC coating (e.g., W-DLC) could reduce the wear of steel bearings and gears under heavy loading surface contact [1][2][3]. In automotive industry, DLC coating has been extensively applied to injection pump, cylinder liner, and camshaft drive assembly because it enables low coefficient of friction, high hardness and excellent lubrication performance [4][5][6].…”

Scuffing resistance of DLC-coated gears lubricated with ecological oil

“…The a-C:H:W coating was deposited by the PVD (Physical Vapour Deposition) method with reactive magnetron sputtering [ 18 ]. The a-C:H:W coating consists of an elemental Cr adhesion layer adjacent to the steel substrate, followed by an The a-C:Cr coating is a hydrogen-free carbon-chromium multilayer coating, with dominating sp 2 structure, deposited by Closed Field Unbalanced Magnetron Sputter Ion Plating (CFUBMSIP) from carbon and chromium targets [ 19 ].…”