Bias-graded deposition of diamond-like carbon for tribological applications

Sam Zhang, Xuan Lam Bui, Yongqing Fu, David L. Butler, Hejun Du

Research output: Contribution to journalArticle

68 Citations (Scopus)

Abstract

Hydrogen-free diamond-like carbon coatings of thickness 1.5 μm were deposited on 440C stainless steel substrates and silicon wafers via DC magnetron sputtering of graphite target at power density of 10.5 W/cm2. RF bias voltage was applied in the range of -20 to -150 V in two configurations: constant bias and bias-graded. The structure, surface topography, hardness and tribological behavior of these coatings were investigated. The surface roughness (Ra) of the coating decreased from 5.8 to 3.4 nm as bias voltage increased. Results from nanoindentation showed that the hardness of the coatings deposited at high bias voltage reached at 30 GPa and toughness (plasticity during indentation deformation) from approximately 50 to 60%. The hardness of the coating deposited with bias-graded configuration was comparable to the coatings deposited at high bias voltage but the toughness and adhesion strength were significantly improved. Ball-on-disc tribotests were carried out under dry, water- and oil-lubrication conditions. The result showed that the bias-graded coating had a very low coefficient of friction (down to 0.07 in oil). Furthermore, after 2.5 km sliding against alumina and steel (6 mm in diameter) at a high load of 10 N with and without lubrication, no sign of damage was observed on the wear track. Bias-graded sputtering deposition is an appropriate technique to combine the hardness, toughness and adhesion strength into one coating for demanding tribological applications.

LanguageEnglish
Pages867-871
Number of pages5
JournalDiamond and Related Materials
Volume13
Issue number4-8
DOIs
Publication statusPublished - 31 Aug 2004
Externally publishedYes

Fingerprint

Diamond
Diamonds
Carbon
diamonds
Coatings
coatings
carbon
Bias voltage
Hardness
hardness
toughness
Toughness
Bond strength (materials)
electric potential
lubrication
Lubrication
Oils
adhesion
oils
Graphite

Keywords

  • adhesion
  • diamond-like carbon
  • sputtering
  • tribology

Cite this

Zhang, Sam ; Bui, Xuan Lam ; Fu, Yongqing ; Butler, David L. ; Du, Hejun. / Bias-graded deposition of diamond-like carbon for tribological applications. In: Diamond and Related Materials. 2004 ; Vol. 13, No. 4-8. pp. 867-871.
@article{7b926e5b60bd49998f9d95adcf17a076,
title = "Bias-graded deposition of diamond-like carbon for tribological applications",
abstract = "Hydrogen-free diamond-like carbon coatings of thickness 1.5 μm were deposited on 440C stainless steel substrates and silicon wafers via DC magnetron sputtering of graphite target at power density of 10.5 W/cm2. RF bias voltage was applied in the range of -20 to -150 V in two configurations: constant bias and bias-graded. The structure, surface topography, hardness and tribological behavior of these coatings were investigated. The surface roughness (Ra) of the coating decreased from 5.8 to 3.4 nm as bias voltage increased. Results from nanoindentation showed that the hardness of the coatings deposited at high bias voltage reached at 30 GPa and toughness (plasticity during indentation deformation) from approximately 50 to 60{\%}. The hardness of the coating deposited with bias-graded configuration was comparable to the coatings deposited at high bias voltage but the toughness and adhesion strength were significantly improved. Ball-on-disc tribotests were carried out under dry, water- and oil-lubrication conditions. The result showed that the bias-graded coating had a very low coefficient of friction (down to 0.07 in oil). Furthermore, after 2.5 km sliding against alumina and steel (6 mm in diameter) at a high load of 10 N with and without lubrication, no sign of damage was observed on the wear track. Bias-graded sputtering deposition is an appropriate technique to combine the hardness, toughness and adhesion strength into one coating for demanding tribological applications.",
keywords = "adhesion, diamond-like carbon, sputtering, tribology",
author = "Sam Zhang and Bui, {Xuan Lam} and Yongqing Fu and Butler, {David L.} and Hejun Du",
year = "2004",
month = "8",
day = "31",
doi = "10.1016/j.diamond.2003.10.043",
language = "English",
volume = "13",
pages = "867--871",
journal = "Diamond and Related Materials",
issn = "0925-9635",
number = "4-8",

}

Bias-graded deposition of diamond-like carbon for tribological applications. / Zhang, Sam; Bui, Xuan Lam; Fu, Yongqing; Butler, David L.; Du, Hejun.

In: Diamond and Related Materials, Vol. 13, No. 4-8, 31.08.2004, p. 867-871.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Bias-graded deposition of diamond-like carbon for tribological applications

AU - Zhang, Sam

AU - Bui, Xuan Lam

AU - Fu, Yongqing

AU - Butler, David L.

AU - Du, Hejun

PY - 2004/8/31

Y1 - 2004/8/31

N2 - Hydrogen-free diamond-like carbon coatings of thickness 1.5 μm were deposited on 440C stainless steel substrates and silicon wafers via DC magnetron sputtering of graphite target at power density of 10.5 W/cm2. RF bias voltage was applied in the range of -20 to -150 V in two configurations: constant bias and bias-graded. The structure, surface topography, hardness and tribological behavior of these coatings were investigated. The surface roughness (Ra) of the coating decreased from 5.8 to 3.4 nm as bias voltage increased. Results from nanoindentation showed that the hardness of the coatings deposited at high bias voltage reached at 30 GPa and toughness (plasticity during indentation deformation) from approximately 50 to 60%. The hardness of the coating deposited with bias-graded configuration was comparable to the coatings deposited at high bias voltage but the toughness and adhesion strength were significantly improved. Ball-on-disc tribotests were carried out under dry, water- and oil-lubrication conditions. The result showed that the bias-graded coating had a very low coefficient of friction (down to 0.07 in oil). Furthermore, after 2.5 km sliding against alumina and steel (6 mm in diameter) at a high load of 10 N with and without lubrication, no sign of damage was observed on the wear track. Bias-graded sputtering deposition is an appropriate technique to combine the hardness, toughness and adhesion strength into one coating for demanding tribological applications.

AB - Hydrogen-free diamond-like carbon coatings of thickness 1.5 μm were deposited on 440C stainless steel substrates and silicon wafers via DC magnetron sputtering of graphite target at power density of 10.5 W/cm2. RF bias voltage was applied in the range of -20 to -150 V in two configurations: constant bias and bias-graded. The structure, surface topography, hardness and tribological behavior of these coatings were investigated. The surface roughness (Ra) of the coating decreased from 5.8 to 3.4 nm as bias voltage increased. Results from nanoindentation showed that the hardness of the coatings deposited at high bias voltage reached at 30 GPa and toughness (plasticity during indentation deformation) from approximately 50 to 60%. The hardness of the coating deposited with bias-graded configuration was comparable to the coatings deposited at high bias voltage but the toughness and adhesion strength were significantly improved. Ball-on-disc tribotests were carried out under dry, water- and oil-lubrication conditions. The result showed that the bias-graded coating had a very low coefficient of friction (down to 0.07 in oil). Furthermore, after 2.5 km sliding against alumina and steel (6 mm in diameter) at a high load of 10 N with and without lubrication, no sign of damage was observed on the wear track. Bias-graded sputtering deposition is an appropriate technique to combine the hardness, toughness and adhesion strength into one coating for demanding tribological applications.

KW - adhesion

KW - diamond-like carbon

KW - sputtering

KW - tribology

UR - http://www.scopus.com/inward/record.url?scp=2442428369&partnerID=8YFLogxK

UR - http://www.sciencedirect.com/science/journal/09259635

U2 - 10.1016/j.diamond.2003.10.043

DO - 10.1016/j.diamond.2003.10.043

M3 - Article

VL - 13

SP - 867

EP - 871

JO - Diamond and Related Materials

T2 - Diamond and Related Materials

JF - Diamond and Related Materials

SN - 0925-9635

IS - 4-8

ER -