Exploring the low friction of diamond-like carbon films in carbon dioxide atmosphere by experiments and first-principles calculations

2018 ◽  
Vol 436 ◽  
pp. 893-899 ◽  
Author(s):  
Lei Huo ◽  
Shunhua Wang ◽  
Jibin Pu ◽  
Junhui Sun ◽  
Zhibin Lu ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
First Principles ◽  
Carbon Films ◽  
Diamond Like Carbon ◽  
First Principles Calculations ◽  
Low Friction ◽  
Carbon Dioxide Atmosphere

scholarly journals Key Role of Transfer Layer in Load Dependence of Friction on Hydrogenated Diamond-Like Carbon Films in Humid Air and Vacuum

Materials ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1550 ◽  
Author(s):  
Yunhai Liu ◽  
Lei Chen ◽  
Bin Zhang ◽  
Zhongyue Cao ◽  
Pengfei Shi ◽  
...  
Keyword(s):  
Applied Load ◽  
Carbon Films ◽  
Diamond Like Carbon ◽  
Low Friction ◽  
Transfer Layer ◽  
Humid Air ◽  
Friction Mechanism ◽  
Sharp Drop ◽  
Practical Applications ◽  
Load Dependence

The friction of hydrogenated diamond-like carbon (H-DLC) films was evaluated under the controlled environments of humid air and vacuum by varying the applied load. In humid air, there is a threshold applied load below which no obvious friction drop occurs and above which the friction decreases to a relatively low level following the running-in process. By contrast, superlubricity can be realized at low applied loads but easily fails at high applied loads under vacuum conditions. Further analysis indicates that the graphitization of the sliding H-DLC surface has a negligible contribution to the sharp drop of friction during the running-in process under both humid air and vacuum conditions. The low friction in humid air and the superlow friction in vacuum are mainly attributed to the formation and stability of the transfer layer on the counterface, which depend on the load and surrounding environment. These results can help us understand the low-friction mechanism of H-DLC film and define optimized working conditions in practical applications, in which the transfer layer can be maintained for a long time under low applied load conditions in vacuum, whereas a high load can benefit the formation of the transfer layer in humid air.

Effect of compressive strain on the Hertzian contact of self-mated fluorinated carbon films

RSC Advances ◽  
2015 ◽  
Vol 5 (52) ◽  
pp. 41604-41607 ◽  
Author(s):  
Renhui Zhang ◽  
Liping Wang
Keyword(s):  
First Principles ◽  
Compressive Strain ◽  
Carbon Films ◽  
Hertzian Contact ◽  
Low Friction ◽  
Friction Mechanism ◽  
Fluorinated Carbon ◽  
First Principles Method

The limitation of the low friction mechanism of self-mated fluorinated carbon films was well probed by the first-principles method.

Effect of Substrate Bias Voltage on the Mechanical and Tribological Properties of Low Concentration Ti-Containing Diamond Like Carbon Films

2012 ◽  
Vol 182-183 ◽  
pp. 232-236 ◽  
Author(s):  
Jin Feng Cui ◽  
Li Qiang ◽  
Bin Zhang ◽  
Xiao Ling ◽  
Jun Yan Zhang
Keyword(s):  
Bias Voltage ◽  
Carbon Films ◽  
Diamond Like Carbon ◽  
Substrate Bias ◽  
Low Friction ◽  
Substrate Bias Voltage ◽  
Mechanical And Tribological Properties ◽  
Si Substrates ◽  
Argon Mixture ◽  
Hardness Values

Ti containing hydrogenated diamond like carbon films (Ti-DLC) was deposited on Si substrates at room temperature by magnetron sputtering Ti-twin target in methane and argon mixture atmosphere via changing the substrate bias voltage. The Ti atomic concentration in the film is less than 0.57% and exists mainly in the form of metallic titanium rather than TiC, confirmed by XPS analysis. The internal compressive stress of the film decreases monotonically with the substrate bias voltage increase. However, the hardness values of the film keep at level (12 GPa) without almost any obvious change with the increase of the substrate bias voltage. Furthermore, Ti-containing DLC film prepared at -1600 V substrate bias voltage shows an extremely low wear rate (~10-9mm3/Nm) and low friction coefficient (0.09).

Effects of pressure on the structural, electronic and vibrational properties of solid carbon dioxide phases

2021 ◽  
Author(s):  
Wen-Guang Li ◽  
Yundan Gan ◽  
Zhixin Bai ◽  
Xing-Han Li ◽  
Fu-Sheng Liu ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
First Principles ◽  
Vibrational Properties ◽  
Solid Carbon ◽  
First Principles Calculations ◽  
Solid Carbon Dioxide

The structural, electronic and vibrational properties of the solid carbon dioxide phases (Ⅰ, Ⅱ, Ⅲ, Ⅳ) at pressures of 0 to 70 GPa are studied by first-principles calculations. The calculated...

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