Enhanced tribological performances of zinc oxide/MWCNTs hybrid nanomaterials as the effective lubricant additive in engine oil

2020 ◽  
Vol 253 ◽  
pp. 123447 ◽  
Author(s):  
B.S. Ajay Vardhaman ◽  
M. Amarnath ◽  
J. Ramkumar ◽  
K. Mondal
Keyword(s):  
Zinc Oxide ◽  
Lubricant Additive ◽  
Engine Oil ◽  
Hybrid Nanomaterials ◽  
Effective Lubricant

Numerical treatment of melting heat transfer and entropy generation in stagnation point flow of hybrid nanomaterials (SWCNT-MWCNT/engine oil)

2021 ◽  
Vol 35 (06) ◽  
pp. 2150102
Author(s):  
Ikram Ullah ◽  
Tasawar Hayat ◽  
Ahmed Alsaedi ◽  
Habib M. Fardoun
Keyword(s):  
Velocity Slip ◽  
Engine Oil ◽  
Stretching Cylinder ◽  
Entropy Analysis ◽  
Hybrid Nanomaterials ◽  
Hybrid Nanomaterial ◽  
Order Analysis ◽  
Governing System ◽  
Oil Flow ◽  
Melting Effect

Present attempt inspects the entropy analysis and melting effect in flow of hybrid nanomaterials consisting of CNTs nanoparticles and engine oil Flow is by a stretching cylinder. Formulation is accountable to the viscous dissipation, velocity slip and thermal radiation impacts. In order to estimate the disorder within the thermo-physical frame, second-order analysis has been used. The governing system with the imposed boundary condition is dimensionless via proper variables. Numerical outcomes are expressed graphically and analyzed. Comparison of hybrid nanomaterial, nanomaterials and regular liquid is expressed graphically. Outcomes indicate that the hybrid nanomaterials have great impact throughout the inspection than the ordinary nanomaterials.

A Boundary Lubrication Friction Model Sensitive to Detailed Engine Oil Formulation in an Automotive Cam/Follower Interface

2011 ◽  
Vol 133 (4) ◽  
Author(s):  
Rupesh Roshan ◽  
Martin Priest ◽  
Anne Neville ◽  
Ardian Morina ◽  
Xin Xia ◽  
...  
Keyword(s):  
Boundary Lubrication ◽  
Fuel Efficiency ◽  
Lubricant Additive ◽  
Friction Model ◽  
Operating Conditions ◽  
Valve Train ◽  
Engine Oil ◽  
Contact Friction ◽  
Boundary Lubrication Friction ◽  
Base Oil

Theoretical studies have shown that in severe operating conditions, valve train friction losses are significant and have an adverse effect on fuel efficiency. However, recent studies have shown that existing valve train friction models do not reliably predict friction in boundary and mixed lubrication conditions and are not sensitive to lubricant chemistry. In these conditions, the friction losses depend on the tribological performance of tribofilms formed as a result of surface–lubricant additive interactions. In this study, key tribological parameters were extracted from a direct acting tappet type Ford Zetec SE (Sigma) valve train, and controlled experiments were performed in a block-on-ring tribometer under conditions representative of boundary lubrication in a cam and follower contact. Friction was recorded for the tribofilms formed by molybdenum dithiocarbamate (MoDTC), zinc dialkyldithiophosphate (ZDDP), detergent (calcium sulfonate), and dispersant (polyisobutylene succinimide) additives in an ester-containing synthetic polyalphaolefin (PAO) base oil on AISI E52100 steel components. A multiple linear regression technique was used to obtain a friction model in boundary lubrication from the friction data taken from the block-on-ring tribometer tests. The model was developed empirically as a function of the ZDDP, MoDTC, detergent, and dispersant concentration in the oil and the temperature and sliding speed. The resulting friction model is sensitive to lubricant chemistry in boundary lubrication. The tribofilm friction model showed sensitivity to the ZDDP–MoDTC, MoDTC–dispersant, MoDTC–speed, ZDDP–temperature, detergent–temperature, and detergent–speed interactions. Friction decreases with an increase in the temperature for all ZDDP/MoDTC ratios, and oils containing detergent and dispersant showed high friction due to antagonistic interactions between MoDTC–detergent and MoDTC–dispersant additive combinations.

Effect of zinc oxide incorporation on the morphology of tris(8-hydroxyquinoline)aluminum/zinc oxide hybrid nanomaterials

2008 ◽  
Vol 516 (21) ◽  
pp. 7299-7305 ◽  
Author(s):  
Periyayya Uthirakumar ◽  
Eun-Kyung Suh ◽  
Chang-Hee Hong
Keyword(s):  
Zinc Oxide ◽  
Hybrid Nanomaterials ◽  
Aluminum Zinc Oxide

Tribological properties of oleic acid-modified zinc oxide nanoparticles as the lubricant additive in poly-alpha olefin and diisooctyl sebacate base oils

RSC Advances ◽  
2016 ◽  
Vol 6 (74) ◽  
pp. 69836-69844 ◽  
Author(s):  
Lili Wu ◽  
Yujuan Zhang ◽  
Guangbin Yang ◽  
Shengmao Zhang ◽  
Laigui Yu ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Oleic Acid ◽  
Zno Nanoparticles ◽  
Zinc Oxide Nanoparticles ◽  
Lubricant Additive ◽  
Oxide Nanoparticles ◽  
Base Oils ◽  
Alpha Olefin ◽  
Modified Zno Nanoparticles ◽  
Average Size

This paper presents OA-modified ZnO nanoparticles with an average size of 4.04 nm as friction-reducing and antiwear lubricant additive in poly-alpha olefin (PAO) and diisooctyl sebacate (DIOS) base oils under boundary lubricanting conditions.

scholarly journals Tribological interaction of plasma functionalized CaCO3 nanoparticles with zinc and ashless dithiophosphate additives

2021 ◽  
Author(s):  
Kimaya P Vyavhare ◽  
Richard B. Timmons ◽  
Ali Erdemir ◽  
Pranesh B. Aswath
Keyword(s):  
Boundary Lubrication ◽  
Internal Combustion Engines ◽  
Strong Support ◽  
Chemical Vapor ◽  
Lubricant Additive ◽  
Engine Oil ◽  
Wear Protection ◽  
Low Concentrations ◽  
Surface Modified ◽  
Dialkyl Dithiophosphate

Abstract Surface-modified CaCO3 nanoparticles, synthesized through plasma-enhanced chemical vapor deposition (PECVD), were employed to improve lubricant additive technology for internal combustion engines via reduction and/or replacement of additives, such as zinc dialkyl dithiophosphate (ZDDP), in engine oil. Various oil formulations were prepared with functionalized CaCO3 nanoparticles, in combination with ashless dialkyl dithiophosphate (DDP) and ZDDP at low concentrations of phosphorus. Tribological test results indicate synergistic interaction of functionalized CaCO3 nanoparticles with ZDDP and DDP, providing enhanced friction and wear performance under boundary lubrication. A comparative study of the tribo-surfaces morphology and chemistry was assessed via atomic force microscopy and X-ray absorption near-edge spectroscopy. Improved wear protection by functionalized CaCO3BM (borate and methacrylate coated) nanoparticles under boundary lubrication was attributed to the formation of calcium and boron-rich 50–80 nm thick tribofilms on the worn surfaces. XANES results revealed that plasma functionalized CaCO3 nanoparticles interact with ZDDP and DDP and participate in tribofilm formation through tribo-chemical reactions and metal cation supply to form stable and wear-resistant tribofilms. These results provide strong support for the potential application of plasma functionalized CaCO3 nano-additives to reduce the concentration of harmful P-based additives in automotive lubricants.

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