Surface modification by multilayered W/W₂N coating

Abstract

In the present work, multilayer physical vapour deposition (PVD) coating of W/W 2 N (tungsten/ tungsten nitride) were deposited on vanadis 23 steel by unbalance reactive magnetron sputtering in a N 2 /Ar atmosphere. Microstructures, mechanical and fundamental properties of W/W 2 N coatings were examined. Pin on disc test was performed on Vanadis 23 steel at room temperature (RT) to elevated temperature (800uC) with the help of bearing steel (100Cr6) and alumina ball to investigate their friction and wear properties. Result shows that friction coefficient of 100Cr6 steel balls are higher than alumina (Al 2 O 3 ) ball, when sliding against W/W 2 N coated Vanadis 23 steel. Scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) analyses were performed to obtain the microstructure and chemical composition of the material. Nanoindentation and scratch test was performed to evaluate the mechanical properties of thin film.

Investigation of monolayer–multilayer PVD nitride coating

“…39 Ti/TiN and Cr/CrN had the same crystalline structure, but due to different lattice constants of Cr/CrN, diffraction peaks were 2h537u, 2h543?39u and 2h562?5u respectively correspond to (111), ( 200) and (220) preferred orientation. X-ray diffraction pattern for tungsten nitride 15 coatings revealed three main zones 26,40 during the study. First, low nitrogen content structure zone a-W with (110) preferential orientation at 2h550u.…”

“…X-ray diffraction peak displacement and the peak broadening were used to measure the internal stresses and the particle size, whereas b-W 2 N (210) is considered for the calculations. W/W 2 N coatings typically showed bW 2 N phase 15 for higher nitrogen content (97?88%), which further reduces hardness of the film.…”

“…13,14 Multilayer W/ W 2 N films were tested at higher temperatures and found that multilayer tungsten/tungsten nitride provided better mechanical and tribological properties in terms of deposition parameters. 15 Kıvak et al 16 and Braic et al 17 have tested monolayer and multilayer physical vapour deposition (PVD) coatings at high speed steel drills. They found minimum coefficient of friction (COF) in case of multilayer coating.…”

The feasibility of synthesis tungsten nitride in magnesium‐tungsten oxide‐melamine ternary system via mechanochemical method

“…Tungsten nitride single phase was obtained with a crystal size of 15 nm and 11 nm from commercial tungsten oxide and tungsten hydroxide [3]. On the other hand, physical vapor deposition (PVD) method was used to produce multilayered tungsten/ tungsten nitride coating on Vanadis 23 steel, which displays an improved wear resistance [10]. Tungsten/ tungsten nitride film possess excellent hardness (higher than 40 GPa), chemical inertness, high melting point (more than 3000 8C) and high thermal and electrical conductivity.…”

“…Tungsten/ tungsten nitride film possess excellent hardness (higher than 40 GPa), chemical inertness, high melting point (more than 3000 8C) and high thermal and electrical conductivity. It is used for various applications such as diffusion barriers in microelectronic devices and hard -wear resistant protective films [10].…”