Friction Properties of Alumina–Silicon Carbide–Silver–Graphene Nanoplatelet Self-Lubricating Composite Prepared by SPS Technique
Al<sub>2</sub>O<sub>3</sub> with SiC, silver, and graphene nanoplatelets (GNPs) powder mixture was produced by ball milling using ethanol as dispersion media. The GNP-reinforced Al<sub>2</sub>O<sub>3</sub>-SiC-Ag ceramic–metal composites were densified...
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MDPI AG
2024-12-01
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| Series: | Lubricants |
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| Online Access: | https://www.mdpi.com/2075-4442/13/1/3 |
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| author | Viktor Puchý Jana Andrejovská Richard Sedlák Róbert Džunda František Kromka Ivan Petryshynets Mária Podobová Ladislav Falat |
| author_facet | Viktor Puchý Jana Andrejovská Richard Sedlák Róbert Džunda František Kromka Ivan Petryshynets Mária Podobová Ladislav Falat |
| author_sort | Viktor Puchý |
| collection | DOAJ |
| description | Al<sub>2</sub>O<sub>3</sub> with SiC, silver, and graphene nanoplatelets (GNPs) powder mixture was produced by ball milling using ethanol as dispersion media. The GNP-reinforced Al<sub>2</sub>O<sub>3</sub>-SiC-Ag ceramic–metal composites were densified by spark plasma sintering technology (SPS). A homogeneous dispersion of GNPs in Al<sub>2</sub>O<sub>3</sub>-SiC-Ag was observed from the sintered samples, and the GNPs were embedded between the grains, which resulted in increasing the contact area. The trans-granular mechanism of crack propagation becomes increasingly dominant by adding GNPs. The hardness reaches 27 GPa, as tested by the Vickers microhardness method, which reflects an increase of 11% compared to Ag-GNPs-free Al<sub>2</sub>O<sub>3</sub>-SiC. On the other hand, by adding Ag-GNP content, the improvement in density is limited. Wear mechanisms, as determined through ball-on-flat testing, including adhesion, abrasion, and microcracks, are observed and discussed. The composite demonstrated remarkable self-lubricating properties, exhibiting a lower coefficient of friction (COF) and wear rate in an air environment compared to monolithic Al₂O₃-SiC. This improvement is attributed to the formation of a self-lubricating film, enabled by the uniform distribution of Ag and GNPs within the Al₂O₃-SiC matrix. The findings of this study propose a novel material design approach for developing self-lubricating ceramic composites with hybrid solid lubricants. |
| format | Article |
| id | doaj-art-c280dcfbcdf442bfaa4ad7f68aa50358 |
| institution | Kabale University |
| issn | 2075-4442 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Lubricants |
| spelling | doaj-art-c280dcfbcdf442bfaa4ad7f68aa503582025-01-24T13:38:56ZengMDPI AGLubricants2075-44422024-12-01131310.3390/lubricants13010003Friction Properties of Alumina–Silicon Carbide–Silver–Graphene Nanoplatelet Self-Lubricating Composite Prepared by SPS TechniqueViktor Puchý0Jana Andrejovská1Richard Sedlák2Róbert Džunda3František Kromka4Ivan Petryshynets5Mária Podobová6Ladislav Falat7Institute of Materials Research SAS, Watsonova 47, 04001 Košice, SlovakiaInstitute of Materials Research SAS, Watsonova 47, 04001 Košice, SlovakiaInstitute of Materials Research SAS, Watsonova 47, 04001 Košice, SlovakiaInstitute of Materials Research SAS, Watsonova 47, 04001 Košice, SlovakiaInstitute of Materials Research SAS, Watsonova 47, 04001 Košice, SlovakiaInstitute of Materials Research SAS, Watsonova 47, 04001 Košice, SlovakiaInstitute of Materials Research SAS, Watsonova 47, 04001 Košice, SlovakiaInstitute of Materials Research SAS, Watsonova 47, 04001 Košice, SlovakiaAl<sub>2</sub>O<sub>3</sub> with SiC, silver, and graphene nanoplatelets (GNPs) powder mixture was produced by ball milling using ethanol as dispersion media. The GNP-reinforced Al<sub>2</sub>O<sub>3</sub>-SiC-Ag ceramic–metal composites were densified by spark plasma sintering technology (SPS). A homogeneous dispersion of GNPs in Al<sub>2</sub>O<sub>3</sub>-SiC-Ag was observed from the sintered samples, and the GNPs were embedded between the grains, which resulted in increasing the contact area. The trans-granular mechanism of crack propagation becomes increasingly dominant by adding GNPs. The hardness reaches 27 GPa, as tested by the Vickers microhardness method, which reflects an increase of 11% compared to Ag-GNPs-free Al<sub>2</sub>O<sub>3</sub>-SiC. On the other hand, by adding Ag-GNP content, the improvement in density is limited. Wear mechanisms, as determined through ball-on-flat testing, including adhesion, abrasion, and microcracks, are observed and discussed. The composite demonstrated remarkable self-lubricating properties, exhibiting a lower coefficient of friction (COF) and wear rate in an air environment compared to monolithic Al₂O₃-SiC. This improvement is attributed to the formation of a self-lubricating film, enabled by the uniform distribution of Ag and GNPs within the Al₂O₃-SiC matrix. The findings of this study propose a novel material design approach for developing self-lubricating ceramic composites with hybrid solid lubricants.https://www.mdpi.com/2075-4442/13/1/3aluminasilicon carbideself-lubricating compositegraphene nanoplateletsilverspark plasma sintering |
| spellingShingle | Viktor Puchý Jana Andrejovská Richard Sedlák Róbert Džunda František Kromka Ivan Petryshynets Mária Podobová Ladislav Falat Friction Properties of Alumina–Silicon Carbide–Silver–Graphene Nanoplatelet Self-Lubricating Composite Prepared by SPS Technique Lubricants alumina silicon carbide self-lubricating composite graphene nanoplatelet silver spark plasma sintering |
| title | Friction Properties of Alumina–Silicon Carbide–Silver–Graphene Nanoplatelet Self-Lubricating Composite Prepared by SPS Technique |
| title_full | Friction Properties of Alumina–Silicon Carbide–Silver–Graphene Nanoplatelet Self-Lubricating Composite Prepared by SPS Technique |
| title_fullStr | Friction Properties of Alumina–Silicon Carbide–Silver–Graphene Nanoplatelet Self-Lubricating Composite Prepared by SPS Technique |
| title_full_unstemmed | Friction Properties of Alumina–Silicon Carbide–Silver–Graphene Nanoplatelet Self-Lubricating Composite Prepared by SPS Technique |
| title_short | Friction Properties of Alumina–Silicon Carbide–Silver–Graphene Nanoplatelet Self-Lubricating Composite Prepared by SPS Technique |
| title_sort | friction properties of alumina silicon carbide silver graphene nanoplatelet self lubricating composite prepared by sps technique |
| topic | alumina silicon carbide self-lubricating composite graphene nanoplatelet silver spark plasma sintering |
| url | https://www.mdpi.com/2075-4442/13/1/3 |
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