Investigation of Nano-Mechanical and- Tribological Properties of Hydrogenated Diamond Like Carbon (DLC) Coatings

Jeng, Y. -R.; Islam, S.; Wu, K-T.; Erdemir, A.; Eryilmaz, O.

doi:10.1017/jmech.2016.106

Investigation of Nano-Mechanical and- Tribological Properties of Hydrogenated Diamond Like Carbon (DLC) Coatings

Journal Article · Fri Oct 28 00:00:00 EDT 2016 · Journal of Mechanics

DOI:https://doi.org/10.1017/jmech.2016.106· OSTI ID:1484028

Jeng, Y. -R.; Islam, S.; Wu, K-T.; Erdemir, A.; Eryilmaz, O.

Abstract

Hydrogenated diamond like Carbon (H-DLC) is a promising lubricious coating that attracted a great deal of interest in recent years mainly because of its outstanding tribological properties. In this study, the nano-mechanical and -tribological properties of a range of H-DLC films were investigated. Specifically, four kinds of H-DLC coatings were produced on Si substrates in pure acetylene, pure methane, 25% methane + 75% hydrogen, 50% methane + 50% hydrogen discharge plasmas using a plasma enhanced chemical vapour deposition (PECVD) system. Nano indentation was performed to measure the mechanical properties such as hardness and young's modulus and nanoscartching was performed to investigate the frictional behavior and wear mechanism of the H-DLC samples in open air. Moreover, Vickers indentation method was utilized to assess the fracture toughness of the samples. The results revealed that there is a strong correlation between the mechanical properties (hardness, young's modulus, fracture toughness) and the friction coefficient of DLC coatings and the source gas chemistry. Lower hydrogen to carbon ratio in source gas leads to higher hardness, young's modulus, fracture toughness and lower friction coefficient. Furthermore, lower wear volume of the coated materials was observed when the friction coefficient was lower. It was also confirmed that lower hydrogen content of the DLC coating leads to higher wear resistance under nanoscratch conditions.

Research Organization:: Argonne National Laboratory (ANL)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE) - Office of Vehicle Technology

DOE Contract Number:: AC02-06CH11357

OSTI ID:: 1484028

Journal Information:: Journal of Mechanics, Journal Name: Journal of Mechanics Journal Issue: 06 Vol. 33; ISSN applab; ISSN 1727-7191

Country of Publication:: United States

Language:: English

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