Two-step strategy for improving the tribological performance of Si3N4 ceramics: Controlled addition of SiC nanoparticles and graphene-based nanostructures |
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| Affiliation: | 1. Institute of Materials Science, TU Bergakademie Freiberg, Germany;2. Fraunhofer Institute for Ceramic Technologies and Systems, Dresden, Germany;1. College of Mechanical and Electrical Engineering, Shaanxi University of Science & Technology, Xi’an, Shaanxi 710021, China;2. Department of Orthopedics, Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi 710004, China;3. Guang Dong Spectrastar Instruments CO.LTD, Guangzhou, Guangdong 510000, China;1. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, 28 Xian’ning West Road, Xi’an 710049, Shaanxi Province, China;2. College of Mechanical and Electrical Engineering, Shaanxi University of Science & Technology, Xi’an 710021, China;3. Institute for Electric Vehicle and System Control, Xi’an Jiaotong University, Xi’an 710049, China |
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| Abstract: | The tribological behaviour of silicon nitride (Si3N4) ceramics is investigated using a two-step strategy. A set of ceramic composites containing silicon carbide nanoparticles (SiCn) is developed and, subsequently, graphene-based fillers are added to the Si3N4/SiC composite with the best tribological performance. The friction coefficient and the wear rate of Si3N4 are reduced up to 22 % and 40 %, respectively, when a 10 vol.% of SiCn is incorporated into the ceramic matrix due to its improved mechanical response. Si3N4/SiC composites containing 11 vol.% of graphene nanoplatelets (GNPs) or reduced graphene oxide sheets (rGOs) are analysed under isooctane lubrication and dry testing. rGOs composite leads to an important decrease of the friction coefficient (50 %) under lubricated conditions, and an enhancement of the wear resistance (44 %) under dry sliding tests, as compared to the reference Si3N4/SiC. The best performance of rGOs composite is due to the nature of the lubricating tribofilm and its excellent toughness. |
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| Keywords: | Tribology Friction Wear Ceramic composites Graphene |
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