Combined Use of Surface Texturing, Plasma Nitriding and DLC Coating on Tool Steel

In cold rolling, a textured roll can be used to imprint desired surface topography onto the sheet during rolling. This work proposes use of diamond-like carbon (DLC) coatings protect rolls in replacement carcinogenic hard chrome. For that, hydrogenated amorphous (a-C:H) was deposited on plasma nitrided tool steel, both for ground and specimens. Changes due DLC coating were assessed using confocal microscope. Coating adhesion evaluated method VDI 3198. The specimens characterized X-ray diffraction (XRD), microhardness test scanning electron microscopy (SEM). Raman spectroscopy (RS) photoelectron (XPS). results showed soft multilayer consisting layer load support, Si-rich interlayer improve an a-C:H top layer. deposition reduced roughness resulted relatively stable friction good durability, with small damage negligible wear even under dry sliding.