Magnetron sputtered hard a-C coatings of very high toughness

Sam Zhang; Xuan Lam Bui; Yong Qing Fu

doi:10.1016/S0257-8972(02)00900-3

Magnetron sputtered hard a-C coatings of very high toughness

Sam Zhang, Xuan Lam Bui, Yong Qing Fu

Mathematics, Physics and Electrical Engineering

Research output: Contribution to journal › Article › peer-review

93 Citations (Scopus)

Abstract

Hydrogen-free amorphous carbon coatings of high hardness (≈30 GPa) and toughness (plasticity from 50 to 60%) were deposited on 440C steel substrates by DC magnetron sputtering at target power density of 10.5 W/cm2 in the bias range from −20 to −150 V. The surface topography, hardness and tribological behavior of the coatings were investigated. With the increase of bias voltage, coating hardness and surface smoothness increased at expense of some adhesion strength and an increase of coefficient of friction. All coatings showed low friction in humid air and graphitization was observed after a high number of rotation cycles. The graphitization adds more benefit aside from reducing friction: the graphite layer can considerably reduce the adhesive wear since it prevents the asperities of the two surfaces to be adhered to each other.

Original language	English
Pages (from-to)	137-142
Journal	Surface and Coatings Technology
Volume	167
Issue number	2-3
DOIs	https://doi.org/10.1016/S0257-8972(02)00900-3
Publication status	Published - 22 Apr 2003

Keywords

Diamond-like carbon
Tribology
Adhesion strength
Graphitization

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10.1016/S0257-8972(02)00900-3

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title = "Magnetron sputtered hard a-C coatings of very high toughness",

abstract = "Hydrogen-free amorphous carbon coatings of high hardness (≈30 GPa) and toughness (plasticity from 50 to 60%) were deposited on 440C steel substrates by DC magnetron sputtering at target power density of 10.5 W/cm2 in the bias range from −20 to −150 V. The surface topography, hardness and tribological behavior of the coatings were investigated. With the increase of bias voltage, coating hardness and surface smoothness increased at expense of some adhesion strength and an increase of coefficient of friction. All coatings showed low friction in humid air and graphitization was observed after a high number of rotation cycles. The graphitization adds more benefit aside from reducing friction: the graphite layer can considerably reduce the adhesive wear since it prevents the asperities of the two surfaces to be adhered to each other.",

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T1 - Magnetron sputtered hard a-C coatings of very high toughness

AU - Zhang, Sam

AU - Lam Bui, Xuan

AU - Fu, Yong Qing

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N2 - Hydrogen-free amorphous carbon coatings of high hardness (≈30 GPa) and toughness (plasticity from 50 to 60%) were deposited on 440C steel substrates by DC magnetron sputtering at target power density of 10.5 W/cm2 in the bias range from −20 to −150 V. The surface topography, hardness and tribological behavior of the coatings were investigated. With the increase of bias voltage, coating hardness and surface smoothness increased at expense of some adhesion strength and an increase of coefficient of friction. All coatings showed low friction in humid air and graphitization was observed after a high number of rotation cycles. The graphitization adds more benefit aside from reducing friction: the graphite layer can considerably reduce the adhesive wear since it prevents the asperities of the two surfaces to be adhered to each other.

AB - Hydrogen-free amorphous carbon coatings of high hardness (≈30 GPa) and toughness (plasticity from 50 to 60%) were deposited on 440C steel substrates by DC magnetron sputtering at target power density of 10.5 W/cm2 in the bias range from −20 to −150 V. The surface topography, hardness and tribological behavior of the coatings were investigated. With the increase of bias voltage, coating hardness and surface smoothness increased at expense of some adhesion strength and an increase of coefficient of friction. All coatings showed low friction in humid air and graphitization was observed after a high number of rotation cycles. The graphitization adds more benefit aside from reducing friction: the graphite layer can considerably reduce the adhesive wear since it prevents the asperities of the two surfaces to be adhered to each other.

KW - Diamond-like carbon

KW - Tribology

KW - Adhesion strength

KW - Graphitization

U2 - 10.1016/S0257-8972(02)00900-3

DO - 10.1016/S0257-8972(02)00900-3

M3 - Article

SN - 0257-8972

SN - 1879-3347

VL - 167

SP - 137

EP - 142

JO - Surface and Coatings Technology

JF - Surface and Coatings Technology

IS - 2-3

ER -

Magnetron sputtered hard a-C coatings of very high toughness

Abstract

Keywords

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