Optimization of Tribological Performance of hBN/AL2O3Nanoparticles as Engine Oil Additives

The improvement of fuel consumption is an important driving force for research and development in the automobile industry in order to minimize greenhouse gas emissions as well as improving fuel economy. Aluminum alloys are a class of alternative materials that are being used to replace cast iron in motor components due to the concomitant weight savings which result in improved fuel efficiency, and cost savings. Our research focuses on these alternative Al-based alloys as well as traditional steel interfaces, and the protective films that form on the surfaces. Currently the zinc dialkyl-dithiophosphates (ZDDPs) have been used as engine oil additives for over 60 years. They are important chemically-active additives, known for their antioxidant and antiwear characteristics. ZDDPs are known to form a protective film (tribofilms) at rubbed surfaces, typically on iron containing metals surfaces commonly used in the automotive industry; however ZDDPs and the products formed are not well suited for the environment as they can readily poison the catalytic converters and their efficacy on Al-Si alloys is not well established.

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Physicochemical properties and tribological performance of motorbike lubricant dispersed with surface-modified WS2 nanoparticles

Proceedings of the Institution of Mechanical Engineers Part J Journal of Engineering Tribology ◽

10.1177/1350650119829981 ◽

2019 ◽

Vol 233 (9) ◽

pp. 1379-1388 ◽

Cited By ~ 2

Author(s):

V Srinivas ◽

RN Thakur ◽

AK Jain ◽

M Saratchandra Babu

Keyword(s):

Physicochemical Properties ◽

Fuel Consumption ◽

Viscosity Index ◽

Tribological Performance ◽

Engine Oil ◽

Engine Wear ◽

Endurance Tests ◽

The Stability ◽

Surface Modified ◽

Engine Components

This paper investigates the effect of dispersion of surface-modified WS2 nanoparticles on the tribological performance and physicochemical properties of motorbike lubricant. Surface-assisted WS2 nanoparticles were dispersed in motorbike engine oil and an optimum amount of surfactant for best stability of the lubricant suspension was found by investigating the changes in the physicochemical properties of lubricant. The stability analysis using light scattering techniques confirmed the stability of nanoparticles dispersed in lubricant medium and surface-modified WS2 nanoparticles remained stable for 180 days. The physicochemical properties were evaluated as per ASTM standards over a period of two months to check the state of lubricant and observable changes in the properties during this period. The tribological performance of the lubricants was assessed by conducting endurance tests on a 100 cc motor bike. The performance was evaluated by checking the wear of the engine components and fuel consumption. It was found that there were no abnormal changes in the physicochemical properties of lubricant up to a certain surfactant to nanoparticle ratio indicating its utility in automotive engines. However, if the amount of surfactant was increased beyond optimum quantity abnormal changes are seen in the viscosity index, leading to the deterioration of key lubricant properties. Lubricant dispersed with WS2 nanoparticles gave good performance characterized by the reduction in both engine wear and fuel consumption. Worn surfaces of the oil rings after the endurance test were assessed for deposits and it was found that a layer of WS2 deposited on the oil ring surface that reduced friction and wear.

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Studies On Competitive Interactions and Blending Order of Engine Oil Additives by Variable Temperature31P-NMR and IR Spectroscopy

Tribology Transactions ◽

10.1080/10402009908982287 ◽

1999 ◽

Vol 42 (4) ◽

pp. 807-812 ◽

Cited By ~ 14

Author(s):

G. S. Kapur ◽

A. Chopra ◽

A. S. Sarpal ◽

S. S. V. Ramakumar ◽

S. K. Jain

Keyword(s):

Ir Spectroscopy ◽

Competitive Interactions ◽

Engine Oil ◽

Oil Additives

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Effect of hBN/Al2O3 Nanoparticle Additives on the Tribological Performance of Engine Oil

Jurnal Teknologi ◽

10.11113/jt.v66.2685 ◽

2014 ◽

Vol 66 (3) ◽

Cited By ~ 8

Author(s):

Muhammad Ilman Hakimi Chua Abdullah ◽

Mohd Fadzli Abdollah ◽

Hilmi Amiruddin ◽

Noreffendy Tamaldin ◽

Nur Rashid Mat Nuri

Keyword(s):

Diesel Engine ◽

Hexagonal Boron Nitride ◽

Fuel Efficiency ◽

Tribological Performance ◽

Engine Oil ◽

Wear Scar Diameter ◽

Engine Wear ◽

The Coefficient Of Friction ◽

Al2o3 Nanoparticle ◽

Nanoparticle Additives

Nanotechnology currently has an important role in reducing engine wear and improving fuel efficiency within engines using nanoparticle additives in engine oil. In this work, the effect of hexagonal boron nitride (hBN) and alumina (Al2O3) nanoparticle additives, on the tribological performance of SAE 15W40 diesel engine oil, was studied. A tribological test was conducted using a four-ball tribotester. The results show that the coefficient of friction (COF) and wear rate of the ball reduced significantly by dispersing hBN nanoparticle additives in SAE 15W40 diesel engine oil; compared to without or with Al2O3 nanoparticle additives. This is in accordance with the significant reduction of wear scar diameter and smoother worn surfaces observed on the balls.

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