Friction and Delamination Properties of Self-Mating Diamond-Like Carbon Coatings in Water

Yasunori Niiyama; Naotoshi Shimizu; Akinori Kuwayama; Hiroshi Okada; Takanori Takeno; Kazue Kurihara; Koshi Adachi

doi:10.1007/s11249-016-0682-y

Friction and Delamination Properties of Self-Mating Diamond-Like Carbon Coatings in Water

Yasunori Niiyama, Naotoshi Shimizu, Akinori Kuwayama, Hiroshi Okada, Takanori Takeno, Kazue Kurihara, Koshi Adachi

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

11 Citations (Scopus)

Abstract

The friction and delamination properties of self-mating diamond-like carbon (DLC) coatings in water and ambient air were investigated using a ball-on-disk tribometer. An a-C:H-type DLC coating was deposited on SUJ2 bearing steel using plasma chemical vapor deposition. Delamination of DLC coatings occurred in water in relatively mild contact conditions, such as applying a low load and a high sliding speed. However, no delamination occurred under severe contact conditions. Furthermore, delamination never occurred under ambient air conditions. The process that prevents delamination occurring under ambient air conditions is clarified using a detailed analysis of SEM data. Micro-cracks were caused by Hertzian contact with droplets, which then propagated into large ruptures under water conditions; however, they disappeared and formed a smooth surface under ambient air conditions. This is because of the structural change to an sp ²-rich surface. Enhancement of the structural change of DLC coating could suppress delamination in water.

Original language	English
Article number	35
Journal	Tribology Letters
Volume	62
Issue number	2
DOIs	https://doi.org/10.1007/s11249-016-0682-y
Publication status	Published - 2016 May 1

Keywords

Coating
Delamination
Diamond-like carbon
Friction
Tribology
Water

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title = "Friction and Delamination Properties of Self-Mating Diamond-Like Carbon Coatings in Water",

abstract = "The friction and delamination properties of self-mating diamond-like carbon (DLC) coatings in water and ambient air were investigated using a ball-on-disk tribometer. An a-C:H-type DLC coating was deposited on SUJ2 bearing steel using plasma chemical vapor deposition. Delamination of DLC coatings occurred in water in relatively mild contact conditions, such as applying a low load and a high sliding speed. However, no delamination occurred under severe contact conditions. Furthermore, delamination never occurred under ambient air conditions. The process that prevents delamination occurring under ambient air conditions is clarified using a detailed analysis of SEM data. Micro-cracks were caused by Hertzian contact with droplets, which then propagated into large ruptures under water conditions; however, they disappeared and formed a smooth surface under ambient air conditions. This is because of the structural change to an sp 2-rich surface. Enhancement of the structural change of DLC coating could suppress delamination in water.",

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author = "Yasunori Niiyama and Naotoshi Shimizu and Akinori Kuwayama and Hiroshi Okada and Takanori Takeno and Kazue Kurihara and Koshi Adachi",

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AU - Niiyama, Yasunori

AU - Shimizu, Naotoshi

AU - Kuwayama, Akinori

AU - Okada, Hiroshi

AU - Takeno, Takanori

AU - Kurihara, Kazue

AU - Adachi, Koshi

PY - 2016/5/1

Y1 - 2016/5/1

N2 - The friction and delamination properties of self-mating diamond-like carbon (DLC) coatings in water and ambient air were investigated using a ball-on-disk tribometer. An a-C:H-type DLC coating was deposited on SUJ2 bearing steel using plasma chemical vapor deposition. Delamination of DLC coatings occurred in water in relatively mild contact conditions, such as applying a low load and a high sliding speed. However, no delamination occurred under severe contact conditions. Furthermore, delamination never occurred under ambient air conditions. The process that prevents delamination occurring under ambient air conditions is clarified using a detailed analysis of SEM data. Micro-cracks were caused by Hertzian contact with droplets, which then propagated into large ruptures under water conditions; however, they disappeared and formed a smooth surface under ambient air conditions. This is because of the structural change to an sp 2-rich surface. Enhancement of the structural change of DLC coating could suppress delamination in water.

AB - The friction and delamination properties of self-mating diamond-like carbon (DLC) coatings in water and ambient air were investigated using a ball-on-disk tribometer. An a-C:H-type DLC coating was deposited on SUJ2 bearing steel using plasma chemical vapor deposition. Delamination of DLC coatings occurred in water in relatively mild contact conditions, such as applying a low load and a high sliding speed. However, no delamination occurred under severe contact conditions. Furthermore, delamination never occurred under ambient air conditions. The process that prevents delamination occurring under ambient air conditions is clarified using a detailed analysis of SEM data. Micro-cracks were caused by Hertzian contact with droplets, which then propagated into large ruptures under water conditions; however, they disappeared and formed a smooth surface under ambient air conditions. This is because of the structural change to an sp 2-rich surface. Enhancement of the structural change of DLC coating could suppress delamination in water.

KW - Coating

KW - Delamination

KW - Diamond-like carbon

KW - Friction

KW - Tribology

KW - Water

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ER -

Friction and Delamination Properties of Self-Mating Diamond-Like Carbon Coatings in Water

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Keywords

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