Controlling friction and wear of nc-WC/a-C(Al) nanocomposite coating by lubricant/additive synergies

2012 ◽  
Vol 206 (10) ◽  
pp. 2698-2705 ◽  
Author(s):  
Shengguo Zhou ◽  
Liping Wang ◽  
Qunji Xue
Keyword(s):  
Friction And Wear ◽  
Lubricant Additive ◽  
Nanocomposite Coating

scholarly journals Effect of Ionicity of Three Protic Ionic Liquids as Neat Lubricants and Lubricant Additives to a Biolubricant

Coatings ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 713 ◽  
Author(s):  
Hong Guo ◽  
Angela Rina Adukure ◽  
Patricia Iglesias
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Friction And Wear ◽  
Cost Effective ◽  
Lubricant Additive ◽  
Lubricant Additives ◽  
Environmental Damage ◽  
Protic Ionic Liquids ◽  
Protic Ionic Liquid ◽  
Wear Process

Friction and wear of sliding surfaces are responsible for important energy losses and negative environmental effects. The use of environmentally friendly and cost-effective protic ionic liquids as neat lubricants and lubricant additives has the potential to increase the efficiency and durability of mechanical components without increasing the environmental damage. In this work, three halogen-free protic ionic liquids with increasing extent of ionicity, 2-hydroxyethylammonium 2-ethylhexanoate, 2-hydroxymethylammonium 2-ethylhexancate, and 2-hydroxydimethylammonium 2-ethylhexanoate, were synthesized and studied as neat lubricants and additives to a biodegradable oil in a steel–steel contact. The results show that the use of any protic ionic liquid as a neat lubricant or lubricant additive reduced friction and wear with respect to the biodegradable oil. The ionic liquid with the lowest ionicity reached the highest wear reduction. The one possessing the highest ionicity presented the poorest friction and wear behaviors as a neat lubricant, probably due to the more ionic nature of this liquid, which promoted tribocorrosion reactions on the steel surface. This ionic liquid performed better as an additive, showing that a small addition of this liquid in a biodegradable oil is enough to form protective layers on steel surfaces. However, it is not enough to accelerate the wear process with detrimental tribocorrosion reactions.

scholarly journals Tribological Performance of Nanocomposite Carbon Lubricant Additive

Materials ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 149 ◽  
Author(s):  
Chuanyi Xue ◽  
Shouren Wang ◽  
Daosheng Wen ◽  
Gaoqi Wang ◽  
Yong Wang
Keyword(s):  
Friction And Wear ◽  
Frictional Contact ◽  
Adhesive Wear ◽  
Friction Pair ◽  
Lubricant Additive ◽  
Suspension Stability ◽  
Wear Performance ◽  
Base Oil ◽  
Test Conditions ◽  
Friction And Wear Characteristics

In this research, nanocomposite carbon has been found to have excellent tribological properties as a lubricant additive. To reduce high friction and wear in friction pairs, the modified nanocomposite carbon has been prepared for chemical technology. The morphology and microstructure of the modified nanocomposite carbon were investigated via TEM, SEM, EDS, XPS, and Raman. In this study, varying concentrations (1, 3, and 5 wt. %) within the modified nanocomposite carbon were dispersed at 350 SN lubricant for base oil. The suspension stability of lubricating oils with the modified nanocomposite carbon was determined by ultraviolet-visible light (UV-VIS) spectrophotometry. The friction and wear characteristics of lubricants containing materials of the modified nanocomposite carbon were evaluated under reciprocating test conditions to simulate contact. The morphology and microstructure of the friction pair tribofilms produced during frictional contact were investigated via SEM, EDS, and a 3D surface profiler. The results showed that scratches, pits, grooves, and adhesive wear were significantly reduced on the surface of the friction pair which was used with 3% nanocomposite carbon lubricant. Additionally, the modified nanocomposite carbon showed excellent friction reducing and anti-wear performance, with great potential for the application of anti-wear.

Conductive capacity and tribological properties of several carbon materials in conductive greases

2016 ◽  
Vol 68 (5) ◽  
pp. 577-585 ◽  
Author(s):  
Zhengfeng Cao ◽  
Yanqiu Xia ◽  
Xiangyu Ge
Keyword(s):  
Electron Microscope ◽  
Tribological Properties ◽  
Friction And Wear ◽  
Volume Resistivity ◽  
Lubricant Additive ◽  
Step Method ◽  
Content Type ◽  
X Ray ◽  
The Coefficient Of Friction ◽  
Complex Lithium

Purpose The purpose of this paper is to synthesize a new kind of conductive grease which possesses a prominent conductive capacity and good tribological properties. Design/methodology/approach A two-step method was used to prepare complex lithium-based grease. Ketjen black (KB), acetylene black (AB) and carbon black (CB) were characterized by transmission electron microscope and used as lubricant additives to prepare conductive greases. Conductive capacity was evaluated by a conductivity meter, a surface volume resistivity meter and a circuit resistance meter. Tribological properties were investigated by a reciprocating friction and wear tester (MFT-R4000). The worn surfaces were analyzed by a scanning electron microscope, Raman spectroscopy, energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscope. Findings The conductive grease prepared with KB has a prominent conductive capacity at room temperature, 100°C and 150°C. Further, this conductive grease also possesses better tribological properties than AB and KB greases. When the concentration of KB is 1.8 Wt.%, the coefficient of friction and wear width reduced by 11 and 14 per cent, respectively. Originality/value This work is a new application of nanometer KB as a lubricant additive in grease, which provides a direction for preparing conductive grease. The conductivity and tribology experiments have been carried out though the variation of experiment conductions.

Sliding friction and wear behaviors of surface-coated natural serpentine mineral powders as lubricant additive

2011 ◽  
Vol 257 (7) ◽  
pp. 2540-2549 ◽  
Author(s):  
Baosen Zhang ◽  
Yi Xu ◽  
Fei Gao ◽  
Peijing Shi ◽  
Binshi Xu ◽  
...  
Keyword(s):  
Friction And Wear ◽  
Sliding Friction ◽  
Lubricant Additive ◽  
Serpentine Mineral

scholarly journals Tribological Behavior of Lamellar Molybdenum Trioxide as a Lubricant Additive

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2427 ◽  
Author(s):  
Wei Tang ◽  
Rui Liu ◽  
Xiangyong Lu ◽  
Shaogang Zhang ◽  
Songyong Liu
Keyword(s):  
Friction And Wear ◽  
Molybdenum Trioxide ◽  
Tribological Behavior ◽  
Normal Load ◽  
Lubricant Additive ◽  
Base Oil ◽  
Reducing Ability ◽  
Wear Reduction ◽  
Friction Reducing ◽  
Friction And Wear Tests

In this study, the tribological behavior of lamellar MoO3 as a lubricant additive was investigated under different concentrations, particle sizes, normal loads, velocity, and temperature. The friction and wear tests were performed using a tribometer and with a reciprocating motion. The results indicate that the friction-reducing ability and antiwear property of the base oil can be improved effectively with the addition of lamellar MoO3. The 0.5 wt % and 0.1 wt % concentrations of MoO3 yield the best antifriction and antiwear effects, respectively. The maximum friction and wear reduction is 19.8% and 55.9%, compared with that of the base oil. It is also found the MoO3 additive can decrease the friction considerably under a high velocity and normal load, and increase the working temperature. The smaller the size of MoO3, the better the friction-reducing effect the lamellar MoO3 shows. The friction-reducing and antiwear mechanisms of lamellar MoO3 were discussed.

High temperature friction and wear behaviour of Ni–P–Ag–Al2O3hybrid nanocomposite coating

2013 ◽  
Vol 91 (4) ◽  
pp. 207-213 ◽  
Author(s):  
S Alirezaei ◽  
S M Monirvaghefi ◽  
A Saatchi ◽  
M Ürgen ◽  
A Motallebzadeh
Keyword(s):  
High Temperature ◽  
Friction And Wear ◽  
Nanocomposite Coating ◽  
Wear Behaviour

Tribological evaluation of piston ring/cylinder liner assembly in automotive engines using GNP as a lubricant additive

2021 ◽  
pp. 095440622110553
Author(s):  
Gurtej Singh ◽  
Mohammad Farooq Wani ◽  
Mohammad Marouf Wani
Keyword(s):  
Wear Rate ◽  
Friction And Wear ◽  
Piston Ring ◽  
Film Formation ◽  
Cylinder Liner ◽  
Lubricant Additive ◽  
Operating Conditions ◽  
Power Losses ◽  
Automotive Engines ◽  
The Coefficient Of Friction

Friction and wear are the main causes of energy dissipation in automotive engines. To minimize the frictional power losses, it is extremely important to improve the tribological characteristics of ring/liner assembly which accounts for almost 40–50% frictional power losses. The present study attempts to mitigate friction and wear of the ring/liner tribo-pair using GNP/SAE 15W40 nano-lubricant. To simulate the ring/liner interface, the tribological performance of nano-lubricants was assessed using a tribometer based on ASTMG181 standard under various operating conditions. The coefficient of friction (COF) and wear rate lowered using graphene nano-lubricants (GNL). The tribological results showed that friction coefficient, wear rate, and surface roughness of piston ring improved in the range 17.71%–42.33%, 25%–40.62%, and 61%, respectively, under GNL lubricating conditions during the boundary lubrication. Further, the characterization of wear tracks of piston ring and cylinder liner confirmed tribo-film formation on worn surfaces resulting in decreased COF and wear rate.

Tribological Property of Biocarbon-Based Magnesium Silicate Hydroxide Nanocomposite as Lubricant Additive at Different Concentrations of Additive and Dispersant

2020 ◽  
Vol 143 (7) ◽  
Author(s):  
Rongqin Gao ◽  
Wenbo Liu ◽  
Qiuying Chang ◽  
Hao Zhang ◽  
Yang Liu
Keyword(s):  
Electron Microscope ◽  
Friction And Wear ◽  
Magnesium Silicate ◽  
Lubricant Additive ◽  
Tribological Performance ◽  
Third Body ◽  
Wear Performance ◽  
Optimal Value ◽  
Friction Surfaces ◽  
Scanning Electron

Abstract The tribological performance of biocarbon-based magnesium silicate hydroxide nanocomposite was examined as a lubricant additive by using a four-ball friction and wear tester. The effect of different concentrations of additives and dispersants was evaluated. The results show the nanocomposite exhibits excellent anti-wear performance and the optimal value is proposed when the content of additive and dispersant is 0.7 wt% and 3 wt% respectively. Through analyzing the friction surfaces by scanning electron microscope and Raman, we proposed the additives acted by a combination of “bearing,” “third body,” and sliding effect to achieve outstanding tribological properties.

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