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The effect of dispersing lithium grease by aluminum oxide (Al2O3) nanoparticles and carbon nanotubes (CNT) on the lubricating properties is discussed. Friction coefficient and wear displayed by the reciprocating sliding of bearing steel ball on aluminum (Al) sheet lubricated by lithium grease dispersed by Al2O3 nanoparticles and CNT.
It was found that friction coefficient displayed by the grease dispersed by CNT displayed the highest values followed by Al2O3, while CNT/Al2O3 showed the lowest values. Minimum values were observed at 0.4 – 0.6 wt. % of nanomaterial content. Minimum wear values were displayed by grease dispersed by CNT/Al2O3of 0.4 wt. % content. Further increase in Al2O3 content significantly increased wear due to their abrasive action. It was observed that combination of CNT/Al2O3 significantly reduced of friction and wear.
That can be explained on the bases that agglomeration of CNT increased their layers and shear stress. Al2O3 showed relatively lower increase in friction due to the ball bearing effect of the nanoparticles. The enhancing effect of CNT/Al2O3 may be attributed to the easy rolling of Al2O3 nanoparticles by the help of the low shear CNT.
DOI
10.21608/jest.2020.118063
Keywords
Aluminum oxide nanoparticles, carbon nanotubes, lithium grease
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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Mechanical and Aerospace Department, Institute of Aviation Engineering and Technology, Giza, EGYPT.
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https://jest.journals.ekb.eg/article_118063.html
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https://jest.journals.ekb.eg/service?article_code=118063
Publication Title
Journal of the Egyptian Society of Tribology
Publication Link
https://jest.journals.ekb.eg/
MainTitle
EFFECT OF DISPERSING LITHIUM GREASE BY ALUMINUM OXIDE NANOPARTICLES AND CARBON NANOTUBES