Physico-Mechanical Properties of Metal Matrix Self-Lubricating Composites Reinforced with Traditional and Nanometric Particles
Innovative nanostructured materials offer the possibility of enhancing the tribological performance of traditional materials like graphite and molybdenum disulfide (MoS<sub>2</sub>). In this study, the scratch resistance of two different copper powders, dendritic and spherical, and their...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-03-01
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| Series: | Lubricants |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4442/10/3/35 |
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| author | Marco Freschi Alessia Arrigoni Oskari Haiko Luca Andena Jukka Kömi Chiara Castiglioni Giovanni Dotelli |
| author_facet | Marco Freschi Alessia Arrigoni Oskari Haiko Luca Andena Jukka Kömi Chiara Castiglioni Giovanni Dotelli |
| author_sort | Marco Freschi |
| collection | DOAJ |
| description | Innovative nanostructured materials offer the possibility of enhancing the tribological performance of traditional materials like graphite and molybdenum disulfide (MoS<sub>2</sub>). In this study, the scratch resistance of two different copper powders, dendritic and spherical, and their composites with traditional MoS<sub>2</sub>, nanometric MoS<sub>2</sub>, and graphene nanoplatelets was investigated. Metal powder metallurgy was employed to produce composite materials with 5 wt% and 10 wt% of each solid lubricant. A ball milling step was employed to grind and mix the matrix copper powder with the lubricants. The use of a cold press combined with the sintering in inert atmosphere at 550 °C limited the oxidation of the copper and the degradation of the solid lubricants. The so-produced materials were characterized through a variety of techniques such as micro-indentation hardness, electrical resistivity, contact angle wettability, X-ray diffraction, Raman scattering, and scanning electron microscopy. Moreover, micro-scratch tests were performed on both pure copper and composite materials for comparing the apparent scratch hardness and friction coefficients. The scratches were examined with confocal laser scanning microscopy (CLSM), to identify the evolution of the damage mechanisms during the formation of the groove. The results highlighted the important difference between the dendritic and spherical copper powders and demonstrated a way to improve wear behavior thanks to the use of nanometric powders as solid lubricants. |
| first_indexed | 2024-03-09T13:33:17Z |
| format | Article |
| id | doaj.art-87f02bf96b1d42d6b1af6d812f42ccd9 |
| institution | Directory Open Access Journal |
| issn | 2075-4442 |
| language | English |
| last_indexed | 2024-03-09T13:33:17Z |
| publishDate | 2022-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Lubricants |
| spelling | doaj.art-87f02bf96b1d42d6b1af6d812f42ccd92023-11-30T21:15:30ZengMDPI AGLubricants2075-44422022-03-011033510.3390/lubricants10030035Physico-Mechanical Properties of Metal Matrix Self-Lubricating Composites Reinforced with Traditional and Nanometric ParticlesMarco Freschi0Alessia Arrigoni1Oskari Haiko2Luca Andena3Jukka Kömi4Chiara Castiglioni5Giovanni Dotelli6Department of Chemistry, Materials and Chemical Engineering “Giulio Natta”, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milan, ItalyDepartment of Chemistry, Materials and Chemical Engineering “Giulio Natta”, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milan, ItalyMaterials and Mechanical Engineering, Centre for Advanced Steels Research, University of Oulu, Pentti Kaiteran Katu 1, 90570 Oulu, FinlandDepartment of Chemistry, Materials and Chemical Engineering “Giulio Natta”, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milan, ItalyMaterials and Mechanical Engineering, Centre for Advanced Steels Research, University of Oulu, Pentti Kaiteran Katu 1, 90570 Oulu, FinlandDepartment of Chemistry, Materials and Chemical Engineering “Giulio Natta”, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milan, ItalyDepartment of Chemistry, Materials and Chemical Engineering “Giulio Natta”, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milan, ItalyInnovative nanostructured materials offer the possibility of enhancing the tribological performance of traditional materials like graphite and molybdenum disulfide (MoS<sub>2</sub>). In this study, the scratch resistance of two different copper powders, dendritic and spherical, and their composites with traditional MoS<sub>2</sub>, nanometric MoS<sub>2</sub>, and graphene nanoplatelets was investigated. Metal powder metallurgy was employed to produce composite materials with 5 wt% and 10 wt% of each solid lubricant. A ball milling step was employed to grind and mix the matrix copper powder with the lubricants. The use of a cold press combined with the sintering in inert atmosphere at 550 °C limited the oxidation of the copper and the degradation of the solid lubricants. The so-produced materials were characterized through a variety of techniques such as micro-indentation hardness, electrical resistivity, contact angle wettability, X-ray diffraction, Raman scattering, and scanning electron microscopy. Moreover, micro-scratch tests were performed on both pure copper and composite materials for comparing the apparent scratch hardness and friction coefficients. The scratches were examined with confocal laser scanning microscopy (CLSM), to identify the evolution of the damage mechanisms during the formation of the groove. The results highlighted the important difference between the dendritic and spherical copper powders and demonstrated a way to improve wear behavior thanks to the use of nanometric powders as solid lubricants.https://www.mdpi.com/2075-4442/10/3/35copper powderscratch resistancesolid lubricantnanometric lubricantcomposite materialmetal powder metallurgy |
| spellingShingle | Marco Freschi Alessia Arrigoni Oskari Haiko Luca Andena Jukka Kömi Chiara Castiglioni Giovanni Dotelli Physico-Mechanical Properties of Metal Matrix Self-Lubricating Composites Reinforced with Traditional and Nanometric Particles Lubricants copper powder scratch resistance solid lubricant nanometric lubricant composite material metal powder metallurgy |
| title | Physico-Mechanical Properties of Metal Matrix Self-Lubricating Composites Reinforced with Traditional and Nanometric Particles |
| title_full | Physico-Mechanical Properties of Metal Matrix Self-Lubricating Composites Reinforced with Traditional and Nanometric Particles |
| title_fullStr | Physico-Mechanical Properties of Metal Matrix Self-Lubricating Composites Reinforced with Traditional and Nanometric Particles |
| title_full_unstemmed | Physico-Mechanical Properties of Metal Matrix Self-Lubricating Composites Reinforced with Traditional and Nanometric Particles |
| title_short | Physico-Mechanical Properties of Metal Matrix Self-Lubricating Composites Reinforced with Traditional and Nanometric Particles |
| title_sort | physico mechanical properties of metal matrix self lubricating composites reinforced with traditional and nanometric particles |
| topic | copper powder scratch resistance solid lubricant nanometric lubricant composite material metal powder metallurgy |
| url | https://www.mdpi.com/2075-4442/10/3/35 |
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