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Fabrication and Tribological Properties of Diamond-like Carbon Film with Cr Doping by High-Power Impulse Magnetron Sputtering.

Authors :
Liu, Shuai
Zhuang, Wenjian
Ding, Jicheng
Liu, Yuan
Yu, Weibo
Yang, Ying
Liu, Xingguang
Yuan, Jing
Zheng, Jun
Source :
Coatings (2079-6412); Jul2024, Vol. 14 Issue 7, p916, 13p
Publication Year :
2024

Abstract

The present study aims to investigate the advantages of diamond-like carbon (DLC) films in reducing friction and lubrication to address issues such as the low surface hardness, high friction coefficients, and poor wear resistance of titanium alloys. Cr-doped DLC films were deposited by high-power impulse magnetron sputtering (HiPIMS) in an atmosphere of a gas mixture of Ar and C<subscript>2</subscript>H<subscript>2</subscript>. The energy of the deposited particles was controlled by adjusting the target powers, and four sets of film samples with different powers (4 kW, 8 kW, 12 kW, and 16 kW) were fabricated. The results showed that with an increase in target power, the Cr content increased from 3.73 at. % to 22.65 at. %; meanwhile, the microstructure of the film evolved from an amorphous feature to a nanocomposite structure, with carbide embedded in an amorphous carbon matrix. The sp<superscript>2</superscript>-C bond content was also increased in films, suggesting an intensification of the film's graphitization. The hardness of films exhibited a trend of initially increasing and then decreasing, reaching the maximum value at 12 kW. The friction coefficient and wear rate of films showed a reverse trend compared to hardness variation, namely initially decreasing and then increasing. The friction coefficient reached a minimum value of 0.14, and the wear rate was 2.50 × 10<superscript>−7</superscript> (mm<superscript>3</superscript>)/(N·m), at 8 kW. The abrasive wear was the primary wear mechanism for films deposited at a higher target power. Therefore, by adjusting the target power parameter, it is possible to control the content of the metal and sp<superscript>2</superscript>/sp<superscript>3</superscript> bonds in metal-doped DLC films, thereby regulating the mechanical and tribological properties of the films and providing an effective approach for addressing surface issues in titanium alloys. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
20796412
Volume :
14
Issue :
7
Database :
Complementary Index
Journal :
Coatings (2079-6412)
Publication Type :
Academic Journal
Accession number :
178694847
Full Text :
https://doi.org/10.3390/coatings14070916