Failure Behavior of Hydrogenated and Hydrogen Free Diamond Like Carbon (DLC) Films in Water Environment

Diamond like carbon (DLC) film exhibits typical properties such as high hardness and low coefficient of friction, often used to improve fiction and wear performance. In the application of surface modification of medical implants, it is of great interests to investigate the failure mechanism of DLC i...

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Bibliographic Details
Published in:Journal of bio- and tribo-corrosion 2021-12, Vol.7 (4), Article 149
Main Authors: Zhang, Tengfei, Xu, Zhaoying, Wang, Jinbiao, Huang, Weijiu, Hou, Xiaodong, Paddea, Sanjooram, Su, Yongyao
Format: Article
Language:English
Subjects:
Arc deposition
Biomaterials
Chemistry and Materials Science
Coefficient of friction
Contact stresses
Corrosion
Corrosion and Coatings
Cyclotron resonance
Diamond-like carbon films
Electron cyclotron resonance
Failure mechanisms
Hardness
Hydrogenation
Materials Science
Medical equipment
Plasma enhanced chemical vapor deposition
Service life
Solid Mechanics
Surgical implants
Tribology
Wear
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Summary:Diamond like carbon (DLC) film exhibits typical properties such as high hardness and low coefficient of friction, often used to improve fiction and wear performance. In the application of surface modification of medical implants, it is of great interests to investigate the failure mechanism of DLC in water environment, in order to avoid the early-stage delamination of DLC film in vivo and promote the application of DLC in implanted medical devices. In this work, four kinds of DLC films were prepared by electron cyclotron resonance plasma enhanced chemical vapor deposition, plasma immersion ion deposition and filtered cathode vacuum arc methods. The wear and failure behavior of DLC films in air and water environment were investigated by ball-on-disc tribological experiments. The results show the friction coefficient of DLC film with high hydrophilic is sensitive to the water environment. Both the interface corrosion and mechanical property affect the adhesion failure of DLC film in water. Hydrogenated DLC film is vulnerable to water environment because the hydrogenous interface is susceptible to corrosion, however, the low hardness and low modulus can reduce the contact stress, which is help to achieve a longer service life of hydrogenated DLC film in water. Hydrogen free DLC film is less sensitive to water environment compared with the hydrogenated one.
ISSN:2198-4220
2198-4239
DOI:10.1007/s40735-021-00574-9