Tribological Behavior of Novel CNTs-Based Lubricant Grease in Steady-State and Fretting Sliding Conditions
The tribological behavior of novel 7.5 wt% carbon nanotube-based lubricant greases in PAO (polyalphaolefin) oil with and without 1.0 wt% MoS<sub>2</sub>, together with several other commercial greases such as calcium, lithium, were studied. The test results showed a marked reduction of f...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-10-01
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| Series: | Lubricants |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4442/9/11/107 |
| _version_ | 1797509636434165760 |
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| author | Adolfo Senatore Haiping Hong Veronica D’Urso Hammad Younes |
| author_facet | Adolfo Senatore Haiping Hong Veronica D’Urso Hammad Younes |
| author_sort | Adolfo Senatore |
| collection | DOAJ |
| description | The tribological behavior of novel 7.5 wt% carbon nanotube-based lubricant greases in PAO (polyalphaolefin) oil with and without 1.0 wt% MoS<sub>2</sub>, together with several other commercial greases such as calcium, lithium, were studied. The test results showed a marked reduction of frictional coefficient achieved by the CNTs based grease samples with an average benefit of around 30% compared to conventional greases. The steady state test under 1.00 GPa average contact pressure in a mixed lubrication regime and the fretting test showed the best results in terms of friction reduction obtained by CNTs greases. Steady state tests at higher average contact pressure of 1.67 GPa proved to have a lower friction coefficient for CNTs grease containing MoS<sub>2</sub>; otherwise CNTs grease without MoS<sub>2</sub> showed an average value of CoF comparable to calcium and lithium greases, both in a boundary and a mixed regime. The protection against wear, a considerable decrease (−60%) of reference parameter was measured with CNTs grease with MoS<sub>2</sub> (NLGI 2) in comparison with the worst conventional grease and −22% in comparison with the best conventional grease. The data indicated that our novel carbon nanotube greases show superior tribological properties and will have promising applications in the corresponding industry. |
| first_indexed | 2024-03-10T05:20:34Z |
| format | Article |
| id | doaj.art-3ece13c9bce14cbc83b1dc4f93c63b0b |
| institution | Directory Open Access Journal |
| issn | 2075-4442 |
| language | English |
| last_indexed | 2024-03-10T05:20:34Z |
| publishDate | 2021-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Lubricants |
| spelling | doaj.art-3ece13c9bce14cbc83b1dc4f93c63b0b2023-11-23T00:05:37ZengMDPI AGLubricants2075-44422021-10-0191110710.3390/lubricants9110107Tribological Behavior of Novel CNTs-Based Lubricant Grease in Steady-State and Fretting Sliding ConditionsAdolfo Senatore0Haiping Hong1Veronica D’Urso2Hammad Younes3Department of Industrial Engineering, University of Salerno, via Giovanni Paolo II, 132, I-84084 Fisciano, ItalyDepartment of Electrical Engineering, South Dakota School of Mines and Technology, Rapid City, SD 57701, USADepartment of Industrial Engineering, University of Salerno, via Giovanni Paolo II, 132, I-84084 Fisciano, ItalyDepartment of Electrical Engineering, South Dakota School of Mines and Technology, Rapid City, SD 57701, USAThe tribological behavior of novel 7.5 wt% carbon nanotube-based lubricant greases in PAO (polyalphaolefin) oil with and without 1.0 wt% MoS<sub>2</sub>, together with several other commercial greases such as calcium, lithium, were studied. The test results showed a marked reduction of frictional coefficient achieved by the CNTs based grease samples with an average benefit of around 30% compared to conventional greases. The steady state test under 1.00 GPa average contact pressure in a mixed lubrication regime and the fretting test showed the best results in terms of friction reduction obtained by CNTs greases. Steady state tests at higher average contact pressure of 1.67 GPa proved to have a lower friction coefficient for CNTs grease containing MoS<sub>2</sub>; otherwise CNTs grease without MoS<sub>2</sub> showed an average value of CoF comparable to calcium and lithium greases, both in a boundary and a mixed regime. The protection against wear, a considerable decrease (−60%) of reference parameter was measured with CNTs grease with MoS<sub>2</sub> (NLGI 2) in comparison with the worst conventional grease and −22% in comparison with the best conventional grease. The data indicated that our novel carbon nanotube greases show superior tribological properties and will have promising applications in the corresponding industry.https://www.mdpi.com/2075-4442/9/11/107greasePAOCNTswearcoefficient of frictiontribological behavior |
| spellingShingle | Adolfo Senatore Haiping Hong Veronica D’Urso Hammad Younes Tribological Behavior of Novel CNTs-Based Lubricant Grease in Steady-State and Fretting Sliding Conditions Lubricants grease PAO CNTs wear coefficient of friction tribological behavior |
| title | Tribological Behavior of Novel CNTs-Based Lubricant Grease in Steady-State and Fretting Sliding Conditions |
| title_full | Tribological Behavior of Novel CNTs-Based Lubricant Grease in Steady-State and Fretting Sliding Conditions |
| title_fullStr | Tribological Behavior of Novel CNTs-Based Lubricant Grease in Steady-State and Fretting Sliding Conditions |
| title_full_unstemmed | Tribological Behavior of Novel CNTs-Based Lubricant Grease in Steady-State and Fretting Sliding Conditions |
| title_short | Tribological Behavior of Novel CNTs-Based Lubricant Grease in Steady-State and Fretting Sliding Conditions |
| title_sort | tribological behavior of novel cnts based lubricant grease in steady state and fretting sliding conditions |
| topic | grease PAO CNTs wear coefficient of friction tribological behavior |
| url | https://www.mdpi.com/2075-4442/9/11/107 |
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