Tribological Behavior of Spark Plasma Sintered Aluminum-Graphene Composites at Room and Elevated Temperatures
This study examines the role of Graphene nanoplatelets (GNPs) as a solid lubricant additive to aluminum. Pure Al and Al-2 vol % GNP pellets are sintered by Spark Plasma Sintering (SPS). Their tribological properties are evaluated by a ball-on-disk tribometer at room temperature (RT) and high tempera...
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| Format: | Article |
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MDPI AG
2017-01-01
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| Series: | Technologies |
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| Online Access: | http://www.mdpi.com/2227-7080/5/1/4 |
| _version_ | 1818273406646222848 |
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| author | Sara Rengifo Cheng Zhang Sandip Harimkar Benjamin Boesl Arvind Agarwal |
| author_facet | Sara Rengifo Cheng Zhang Sandip Harimkar Benjamin Boesl Arvind Agarwal |
| author_sort | Sara Rengifo |
| collection | DOAJ |
| description | This study examines the role of Graphene nanoplatelets (GNPs) as a solid lubricant additive to aluminum. Pure Al and Al-2 vol % GNP pellets are sintered by Spark Plasma Sintering (SPS). Their tribological properties are evaluated by a ball-on-disk tribometer at room temperature (RT) and high temperature (200 °C). Al-2 vol % GNP composite displayed poor densification (91%) and low hardness, resulting in poor wear resistance as compared to pure Al. However GNP addition resulted in a lower coefficient of friction (COF) as compared to pure aluminum at both temperatures. The results demonstrated that GNPs contribute to reducing COF by forming a protective tribolayer. GNPs also play a unique role in reducing oxygen ingress at 200 °C. It is concluded that the packing density of a starting powder blend of Al-GNP needs to be improved by using irregular shaped aluminum powder mixed with both larger and smaller GNPs. This would result in greater densification and improve wear rate while maintaining low COF. |
| first_indexed | 2024-12-12T21:57:28Z |
| format | Article |
| id | doaj.art-938ef12cf2204a77a5b90a8bd9af5762 |
| institution | Directory Open Access Journal |
| issn | 2227-7080 |
| language | English |
| last_indexed | 2024-12-12T21:57:28Z |
| publishDate | 2017-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Technologies |
| spelling | doaj.art-938ef12cf2204a77a5b90a8bd9af57622022-12-22T00:10:35ZengMDPI AGTechnologies2227-70802017-01-0151410.3390/technologies5010004technologies5010004Tribological Behavior of Spark Plasma Sintered Aluminum-Graphene Composites at Room and Elevated TemperaturesSara Rengifo0Cheng Zhang1Sandip Harimkar2Benjamin Boesl3Arvind Agarwal4Plasma Forming Laboratory, Department of Mechanical and Materials Engineering, Florida International University, Miami, FL 33174, USAPlasma Forming Laboratory, Department of Mechanical and Materials Engineering, Florida International University, Miami, FL 33174, USASchool of Mechanical and Aerospace Engineering, Oklahoma State University, 218 Engineering North, Stillwater, OK 74078, USAPlasma Forming Laboratory, Department of Mechanical and Materials Engineering, Florida International University, Miami, FL 33174, USAPlasma Forming Laboratory, Department of Mechanical and Materials Engineering, Florida International University, Miami, FL 33174, USAThis study examines the role of Graphene nanoplatelets (GNPs) as a solid lubricant additive to aluminum. Pure Al and Al-2 vol % GNP pellets are sintered by Spark Plasma Sintering (SPS). Their tribological properties are evaluated by a ball-on-disk tribometer at room temperature (RT) and high temperature (200 °C). Al-2 vol % GNP composite displayed poor densification (91%) and low hardness, resulting in poor wear resistance as compared to pure Al. However GNP addition resulted in a lower coefficient of friction (COF) as compared to pure aluminum at both temperatures. The results demonstrated that GNPs contribute to reducing COF by forming a protective tribolayer. GNPs also play a unique role in reducing oxygen ingress at 200 °C. It is concluded that the packing density of a starting powder blend of Al-GNP needs to be improved by using irregular shaped aluminum powder mixed with both larger and smaller GNPs. This would result in greater densification and improve wear rate while maintaining low COF.http://www.mdpi.com/2227-7080/5/1/4coefficient of frictionwear ratelubricant additivegraphenealuminumSpark Plasma Sintering |
| spellingShingle | Sara Rengifo Cheng Zhang Sandip Harimkar Benjamin Boesl Arvind Agarwal Tribological Behavior of Spark Plasma Sintered Aluminum-Graphene Composites at Room and Elevated Temperatures Technologies coefficient of friction wear rate lubricant additive graphene aluminum Spark Plasma Sintering |
| title | Tribological Behavior of Spark Plasma Sintered Aluminum-Graphene Composites at Room and Elevated Temperatures |
| title_full | Tribological Behavior of Spark Plasma Sintered Aluminum-Graphene Composites at Room and Elevated Temperatures |
| title_fullStr | Tribological Behavior of Spark Plasma Sintered Aluminum-Graphene Composites at Room and Elevated Temperatures |
| title_full_unstemmed | Tribological Behavior of Spark Plasma Sintered Aluminum-Graphene Composites at Room and Elevated Temperatures |
| title_short | Tribological Behavior of Spark Plasma Sintered Aluminum-Graphene Composites at Room and Elevated Temperatures |
| title_sort | tribological behavior of spark plasma sintered aluminum graphene composites at room and elevated temperatures |
| topic | coefficient of friction wear rate lubricant additive graphene aluminum Spark Plasma Sintering |
| url | http://www.mdpi.com/2227-7080/5/1/4 |
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