Research Papers: Friction and Wear

Friction and Wear Reduction Mechanisms of the Reciprocating Contact Interfaces Using Nanolubricant Under Different Loads and Speeds

[+] Author and Article Information
Mohamed Kamal Ahmed Ali

Hubei Key Laboratory of Advanced Technology
for Automotive Components,
Wuhan University of Technology,
Wuhan 430070, China;
Automotive and Tractors Engineering
Faculty of Engineering,
Minia University,
El-Minia 61111, Egypt;
Hubei Collaborative Innovation Center for
Automotive Components Technology,
Wuhan 430070, China
e-mail: eng.m.kamal@mu.edu.eg

Hou Xianjun

Hubei Key Laboratory of Advanced Technology
for Automotive Components,
Wuhan University of Technology,
Wuhan 430070, China;
Hubei Collaborative Innovation Center for
Automotive Components Technology,
Wuhan 430070, China
e-mail: houxj@whut.edu.cn

F. A. Essa

Mechanical Engineering Department,
Faculty of Engineering,
Kafrelsheikh University,
Kafrelsheikh 33516, Egypt

Mohamed A. A. Abdelkareem, Ahmed Elagouz

Hubei Key Laboratory of Advanced Technology
for Automotive Components,
Wuhan University of Technology,
Wuhan 430070, China;
Automotive and Tractors Engineering
Faculty of Engineering,
Minia University,
El-Minia 61111, Egypt;
Hubei Collaborative Innovation Center for
Automotive Components Technology,
Wuhan 430070, China

S. W. Sharshir

Mechanical Engineering Department, Faculty of
Engineering, Kafrelsheikh University,
Kafrelsheikh 33516, Egypt

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received August 22, 2017; final manuscript received February 15, 2018; published online April 30, 2018. Assoc. Editor: Dae-Eun Kim.

J. Tribol 140(5), 051606 (Apr 30, 2018) (10 pages) Paper No: TRIB-17-1329; doi: 10.1115/1.4039720 History: Received August 22, 2017; Revised February 15, 2018

This study aims to reveal the roles and mechanisms of Al2O3/TiO2 hybrid nanoparticles into the lube oils which could reinforce engine components durability via reducing the friction, wear, or fuel economy in automotive engines. The tribological tests were carried out under different sliding speeds from 0.21 to 1.75 m/s and loads from 30 to 250 N using a reciprocating tribometer to simulate the ring/liner interface in the engine according to ASTM G181. The tribological results using hybrid nanolubricants suggested that the friction coefficient and wear rate of the ring decreased in the ranges 39–53% and 25–33%, respectively, compared to nanoparticles-free lube oil. The combined evidence of the worn surfaces analysis confirmed that the key mechanisms in antifriction and antiwear are a combination of the nanoparticles rolling mechanism and the replenishment mechanism of tribofilms on the sliding contact interfaces. In addition, a tribofilm formed on the rubbing surfaces is not only from the nanoparticles but also from Fe which is formed as a result of iron debris particles and oil additive package such as P and S originating from zinc dialkyldithiophosphate.

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Fig. 1

The influence of the nanolubricant additives on the friction coefficient as compared with traditional oils during various lubrication regimes [9]

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Fig. 2

The effect of the sliding speed on the oil film thickness under the different diamond concentrations [13]

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Fig. 3

Transmission electron micrographs for TiO2 nanoparticles (a) and (b) and Al2O3 nanoparticles (c) and (d)

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Fig. 4

XRD patterns of Al2O3 and TiO2 nanoparticles [23]

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Fig. 5

The variation in absorbance value and shifting of λmax for nanolubricant based on ultraviolet (UV)-vis analysis with different times

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Fig. 6

Tribometer bench of the piston ring/cylinder liner interface: (1) bench base, (2) AC electrical motor, (3) crank mechanism, (4) fixed guide, (5) sliding guide, (6) ring/liner contact with nanolubricant, (7) friction force sensor, (8) controllable temperature room, (9) weights, (10) data acquisition system and PC, and (11) speed controller

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Fig. 7

XRD patterns of the frictional specimens before sliding tests

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Fig. 8

The profilometric of running face for piston ring (a) and the schematic drawings of the wear volume of the ring (b)

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Fig. 9

The time history of the friction coefficient signal between the ring and liner under 1.3 m/s sliding speed and 220 N contact load during lubrication by nanolubricants

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Fig. 10

The effect of Al2O3/TiO2 hybrid nano-additives on the friction coefficient and the ring wear rate with different sliding speeds under 150 N contact load

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Fig. 11

The effect of Al2O3/TiO2 hybrid nano-additives on the friction coefficient and ring wear rate with different contact loads and a 1.3 m/s sliding speed

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Fig. 12

Morphology of the worn surfaces of the ring under lubrication by commercial oil (a) and (b), lubrication by Al2O3/TiO2 hybrid nanolubricants (c) and (d), (e) EDS maps of the tribofilm elements distribution scanning region corresponding red dash-line box in (c)

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Fig. 13

FE-SEM images, 3D morphology of surface roughness and statistic characteristics of the ring frictional surface (a) and (b) and the liner frictional surface (c) and (d), worn surfaces lubricated by engine oil (a) and (c) and lubricated by Al2O3/TiO2 hybrid nanolubricants (b) and (d)

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Fig. 14

Distribution of self-tribofilm elements in the line-scanning region on the frictional surface of the cylinder liner lubricated by Al2O3/TiO2 hybrid nanolubricants

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Fig. 15

Nanoball bearing mechanism of the nanoparticles in the contact area of the rubbing surfaces [14]



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