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DIAMOND - LIKE CARBON COATINGS FOR TRIBOLOGICAL APPLICATIONS

Bui Xuan Lam 1
Volume & Issue: Vol. 11 No. 10 (2008) | Page No.: 100-109 | DOI: 10.32508/stdj.v11i10.2707
Published: 2008-10-31

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Copyright The Author(s) 2023. This article is published with open access by Vietnam National University, Ho Chi Minh city, Vietnam. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0) which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited. 

Abstract

This paper presents studies on the morphology, mechanical and tribological properties of hydrogen-free diamond-like carbon (DLC) coatings deposited via magnetron sputtering under different bias voltages. Atomic force microscope (AFM), transmission electron microscope (TEM), Raman spectroscopy, nano-indentation and ball-ondisc tribotest were employed to characterize the deposited coatings. Diamond-like carbon coatings had very smooth surface with the roughness (Ra) of less than 3.5 nm (for 1.2 μm - thick coatings on Si wafer). Under high bias voltage, superhard coatings with hardness of more than 30 GPa were obtained. The self-lubrication mechanism of diamond-like carbon combined with smooth surface resulted in very low coefficients friction of less than 0.15. Magnetron sputtered diamond-like carbon show a big potential for tribological applications, especially, under dry or poorly lubricated conditions.

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