Tribological Properties of Polypropylene Composites with Carbon Nanotubes and Sepiolite

2014 ◽  
Vol 14 (7) ◽  
pp. 4918-4929 ◽  
Author(s):  
Victor H. Orozco ◽  
Andres F. Vargas ◽  
Witold Brostow ◽  
Tea Datashvili ◽  
Betty L. López ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Tribological Properties ◽  
Polypropylene Composites

scholarly journals Effect of Size of Multiwalled Carbon Nanotubes Dispersed in Gear Oils for Improvement of Tribological Properties

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Kodanda Rama Rao Chebattina ◽  
V. Srinivas ◽  
N. Mohan Rao
Keyword(s):  
Carbon Nanotubes ◽  
Raman Spectroscopy ◽  
Ball Milling ◽  
Multiwalled Carbon Nanotubes ◽  
Tribological Properties ◽  
Extreme Pressure ◽  
Multiwalled Carbon ◽  
Pristine Mwcnts ◽  
Gear Oil ◽  
The Stability

The aim of the paper is to investigate the effect of size of multiwalled carbon nanotubes (MWCNTs) as additives for dispersion in gear oil to improve the tribological properties. Since long pristine MWCNTs tend to form clusters compromising dispersion stability, they are mildly processed in a ball mill to shorten the length and stabilized with a surfactant before dispersing in lubricant. Investigations are made to assess the effect of ball milling on the size and structure of MWCNTs using electron microscopy and Raman spectroscopy. The long and shortened MWCNTs are dispersed in EP 140 gear oil in 0.5% weight. The stability of the dispersed multiwalled carbon nanotubes is evaluated using light scattering techniques. The antiwear, antifriction, and extreme pressure properties of test oils are evaluated on a four-ball wear tester. It is found that ball milling of MWCNTs has a strong effect on the stability and tribological properties of the lubricant. From Raman spectroscopy, it is found that ball milling time of up to 10 hours did not produce any defects on the surface of MWCNTs. The stability of the lubricant and the antiwear, antifriction, and extreme pressure properties have improved significantly with dispersion shortened MWCNTs. Ball milling for longer periods produces defects on the surface of MWCNTs reducing their advantage as oil additives.

Carbon Nanotubes Improves the Tribological Properties of Ni60/Al2O3 Coatings

2013 ◽  
Vol 785-786 ◽  
pp. 864-871
Author(s):  
Shu Xiao ◽  
Xi Yun Cheng ◽  
De Gui Ma
Keyword(s):  
Carbon Nanotubes ◽  
Tribological Properties ◽  
Microstructural Characterization ◽  
Flame Spraying ◽  
Dual Roles ◽  
Wear Rates ◽  
Transmission Electron ◽  
Pin On Disk ◽  
Wear Tests ◽  
Original Coating

Carbon nanotubes (CNTs) was introduced into Ni60/Al2O3coating by flame spraying. The effect of adding CNTs on the tribological properties of the coating was studied by varying the CNTs content as 0.0, 1.5, 3.0 and 4.5 wt% in the Ni60/Al2O3powders. The microhardness tester was used to measure the microhardness of the coating. Wear tests were performed on a pin-on-disk tribometer, to evaluate the tribological properties of the Ni60/Al2O3/CNTs coatings. Microstructural characterization was performed using scanning and transmission electron microscopy. Ni60/Al2O3/CNTs coatings revealed a lower wear rate and friction coefficient compared with the original coating, and their wear rates and friction coefficients showed a decreasing trend with increasing mass fraction of CNTs within the range from 0 to 3.0 wt% due to the effects of the reinforcement and reduced friction of CNTs. The results showed that the CNTs played dual roles in improving the tribological performance of the coating, indirectly by influencing the microstructure and mechanical properties of the coating and directly by acting as a lubricating medium.

Effect of the type of carbon nanotubes on tribological properties of polyamide 6

2009 ◽  
Vol 49 (5) ◽  
pp. 896-902 ◽  
Author(s):  
Luis F. Giraldo ◽  
Betty L. López ◽  
Witold Brostow
Keyword(s):  
Carbon Nanotubes ◽  
Tribological Properties ◽  
Polyamide 6

Enhanced tribological properties of epoxy-based lubricating coatings using carbon nanotubes-ZnS hybrid

2018 ◽  
Vol 344 ◽  
pp. 154-162 ◽  
Author(s):  
Xiang Li ◽  
Beibei Chen ◽  
Yuhan Jia ◽  
Xiaofang Li ◽  
Jin Yang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Tribological Properties
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