scholarly journals Tribological performance of ionic liquid-lubricated carbon brush/collector ring current-carrying friction system

2020 ◽  
Vol 6 (4) ◽  
pp. 104-113
Author(s):  
Yang Fu ◽  
Hongling Qin ◽  
Xiang Xu ◽  
Xiaolong Zhang ◽  
Zhiguang Guo
Author(s):  
Waleed Al-Sallami ◽  
Pourya Parsaeian ◽  
Abdel Dorgham ◽  
Anne Neville

Trihexyltetradecylphosphonium bis(2-ethylhexyl)phosphate (phosphonium phosphate) ionic liquid is soluble in non-polar lubricants. It has been proposed as an effective anti-wear additive comparable to zinc dialkyldithiophosphate. Previously, phosphonium phosphate has shown a better anti-wear performance under some conditions such as high temperature. In this work, the tribological performance and the lubrication mechanism of phosphonium phosphate are compared with that of zinc dialkyldithiophosphate when lubricating silicon under various tribological conditions. This can lead to an understanding of the reasons behind the superior anti-wear performance of phosphonium phosphate under some conditions. A micro-scale study is conducted using a nanotribometer. The results show that both additives lead to a considerable reduction in both friction and wear coefficients. The reduction in the wear coefficient is mainly controlled by the formation of the tribofilm on the rubbing surfaces. Zinc dialkyldithiophosphate can create a thicker tribofilm, which results in a better anti-wear performance. However, the formation of a thicker film will lead to a faster depletion and thus phosphonium phosphate can provide better anti-wear performance when the depletion of zinc dialkyldithiophosphate starts.


Lubricants ◽  
2019 ◽  
Vol 7 (9) ◽  
pp. 72 ◽  
Author(s):  
M.D. Avilés ◽  
C. Sánchez ◽  
R. Pamies ◽  
J. Sanes ◽  
M.D. Bermúdez

The present work intends to provide a brief account of the most recent advances in the use of ionic liquid crystals (ILCs) in the field of tribology, that is, the development of new lubricants with the ability to reduce the coefficients of friction and the wear rates of materials under sliding conditions. After a definition of ILCs and their relationship with neutral liquid crystals (LCs) and ionic liquids (ILs), the review will be focused on the influence of molecular structure and composition on the tribological performance, the combination with base oils, surfactants or water, and the different sliding configuration and potential applications. The main mechanisms proposed in order to justify the lubricating ability of ILCs will be analyzed. Special emphasis will be made for recent results obtained for fatty acid derivatives due to their renewable and environmentally friendly nature.


2013 ◽  
Vol 645 ◽  
pp. 133-136
Author(s):  
Peng Qiao ◽  
Yan Qiu Xia ◽  
Xiang Yu Ge

Overbased calcium sulfonate complex greases have excellent friction and wear properties and have been widely used in metallurgy and mining equipment. The effects and tribological performance of molybdenum dialkydithiocarbamate (MoDTC) and ionic liquid 1-(2-hydroxyethyl)-3-methylimidazolium bis (trifluoromethylsulfonyl) imide ([C2OHMim][NTf2]), 1-(2-hydroxyethyl)-3-hexylimidazolium bis (trifluoromethylsulfonyl) imide ([C2OHHim][NTf2s]), added in overbased calcium sulfonate complex grease as additives were investigated by using reciprocating ball-on-disk sliding friction tester. The results showed that the two kinds of additives with a certain range of concentration could improve the tribological properties of greases.


2019 ◽  
Vol 7 ◽  
Author(s):  
Patrick Rohlmann ◽  
Bulat Munavirov ◽  
István Furó ◽  
Oleg Antzutkin ◽  
Mark William Rutland ◽  
...  

2015 ◽  
Vol 7 (19) ◽  
pp. 10337-10347 ◽  
Author(s):  
Ana Eva Jiménez ◽  
Antonella Rossi ◽  
Marzia Fantauzzi ◽  
Tulia Espinosa ◽  
Joaquin Arias-Pardilla ◽  
...  

2014 ◽  
Vol 56 (1) ◽  
pp. 133-142 ◽  
Author(s):  
N. Saurín ◽  
J. Sanes ◽  
M. D. Bermúdez

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