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The present work discusses the effect of applying external voltage on the tribological characteristics of sliding steel ball against an aluminum sheet lubricated by lithium grease dispersed with silicon dioxide (SiO2) nanoparticles and carbon nanotubes CNTs. Friction and wear tests were conducted by the reciprocating sliding of the ball on aluminum (Al) sheet lubricated by the previous mixture. The polarity of the Al sheet was positive at first then changed to negative to study the effect of polarity. It was found that the friction coefficient values for the negative Al sheet polarity was higher than positive polarity. This may be referred to the attractive force that generated between the positive sand particles and the negative aluminum sheet, which led to increasing the sand particles density on the sheet surface. In addition, it can also be clear that friction coefficient decreases with increasing DC volt value. The morphology of worn surface is analyzed by optical microscopy for measuring the wear scare width as an indication for the wear rate. The wear values decreased with increasing volt values. Minimum wear values were displayed by grease dispersed by SiO2 Nano particles. It was observed that combination of CNTs/SiO2 significantly increases of friction and wear. That can be explained on the bases that agglomeration of CNTs increased their layers and shear stress.
DOI
10.21608/jest.2022.217899
Keywords
electric current, Silicon dioxide nanoparticles, carbon nanotubes, lithium grease, Friction, Wear scar width
Authors
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Department of Production Engineering and Mechanical Design, Faculty of Engineering, Minia University, El-Minia, EGYPT.
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Department of Production Engineering and Mechanical Design, Faculty of Engineering, Minia University, El-Minia, EGYPT.
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-MiddleName
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Department of Production Engineering and Mechanical Design, Faculty of Engineering, Minia University, El-Minia, EGYPT.
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https://jest.journals.ekb.eg/article_217899.html
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https://jest.journals.ekb.eg/service?article_code=217899
Publication Title
Journal of the Egyptian Society of Tribology
Publication Link
https://jest.journals.ekb.eg/
MainTitle
EFFECT OF ELECTRIC CURRENT ON THE TRIBOLOGICAL PROPERTIES OF LITHIUM GREASE DISPERSED BY SILICA NANO PARTICLES AND CARBON NANOTUBES