Published in

Elsevier, Surface and Coatings Technology, (258), p. 1212-1222, 2014

DOI: 10.1016/j.surfcoat.2014.06.061

Links

Tools

Export citation

Search in Google Scholar

Diamond like carbon films deposited by HiPIMS using oscillatory voltage pulses

Journal article published in 2014 by Jianliang Lin, William D. Sproul, Ronghua Wei, Roman Chistyakov
This paper is available in a repository.
This paper is available in a repository.

Full text: Download

Green circle
Preprint: archiving allowed
Orange circle
Postprint: archiving restricted
Red circle
Published version: archiving forbidden
Data provided by SHERPA/RoMEO

Abstract

Diamond like carbon films were deposited by sputtering a graphite target using the deep oscillation magnetron sputtering (DOMS). DOMS is an alternative high power impulse magnetron sputtering technique that uses large voltage oscillation packets to achieve high power pulses for sputtering. The deposition variables include negative substrate bias voltage, working pressure and peak target current density (J). In this study, the deposition rate was varied from 23 nm•min-1 to 70 nm•min-1 by changing the above variables. The peak substrate current density during high power pulses was measured up to 50 mA•cm-2. The microstructure of the films was characterized using scanning electron microscopy and Raman spectroscopy. Higher J, lower working pressure, and properly controlled bias voltage promoted sp3 bond formation and increased the density of the films. Super dense DLC films were obtained by increasing J above 0.75 A•cm-2 at 0.13Pa with a substrate bias voltage of -60 V. The surface of the films became smoother as the J was increased. The adhesion and mechanical and tribological properties of the films were measured using HRC tests, nanoindentation and ball on disk wear tests. The films exhibited excellent adhesion on stainless steel. The films exhibited the maximum hardness value of 35 GPa, the lowest dry sliding COF of 0.09 and the lowest wear rate of 1.5 x10-8 mm3N-1m-1.