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research-article

Friction and Wear Reduction Mechanisms of the Reciprocating Contact Interfaces using Nanolubricant under Different Loads and Speeds

[+] Author and Article Information
M.K.A. Ali

Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan 430070, China; Automotive and Tractors Engineering Department, Faculty of Engineering, Minia University, El-Minia 61111, Egypt; Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan 430070, China
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
houxj@whut.edu.cn

F.A. Essa

Mechanical Engineering Department, Faculty of Engineering, Kafrelsheikh University, Kafrelsheikh 33516, Egypt
3064602230@qq.com

Mohamed A. Abdelkareem

Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan 430070, China; Automotive and Tractors Engineering Department, Faculty of Engineering, Minia University, El-Minia 61111, Egypt; Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan 430070, China
mohamed.a.ali@mu.edu.eg

Ahmed Elagouz

Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan 430070, China; Automotive and Tractors Engineering Department, Faculty of Engineering, Minia University, El-Minia 61111, Egypt; Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan 430070, China
eng_m.kamal2000@yahoo.com

S.W. Sharshir

Mechanical Engineering Department, Faculty of Engineering, Kafrelsheikh University, Kafrelsheikh 33516, Egypt
swellamali@yahoo.com

1Corresponding author.

ASME doi:10.1115/1.4039720 History: Received August 22, 2017; Revised February 15, 2018

Abstract

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 either the friction, wear or fuel economy in automotive engines. The tribological tests were carried out under different sliding speed 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 FE-SEM and EDS confirmed that the key mechanisms in anti-friction and anti-wear 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 result of iron debris particles and oil additive package such as P and S originating from zinc dialkyldithiophosphate (ZDDP).

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