Surface modification by multilayered W/W₂N coating

Abstract

In the present work, multilayer physical vapour deposition (PVD) coating of W/W₂N (tungsten/tungsten nitride) were deposited on vanadis 23 steel by unbalance reactive magnetron sputtering in a N₂/Ar atmosphere. Microstructures, mechanical and fundamental properties of W/W₂N coatings were examined. Pin on disc test was performed on Vanadis 23 steel at room temperature (RT) to elevated temperature (800°C) 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 (Al₂O₃) ball, when sliding against W/W₂N 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.

Keywords:

• Friction
• Mechanical properties
• PVD
• Tungsten
• Nitride

Acknowledgements

The authors gratefully acknowledge the support from the CTU Prague and ISM, Dhanbad.