Wear damage of Si3N4-graphene nanocomposites at room and elevated temperatures |
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Affiliation: | 1. Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, 04353 Košice, Slovakia;2. Bay Zoltán Non-profit Ltd. for Applied Research, Institute for Materials Science and Technology, Fehérvári út 130, H-1116 Budapest, Hungary;3. Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, D-22603 Hamburg, Germany;1. Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, 04353 Košice, Slovak Republic;2. Faculty of Material Science and Technology of STU, Paulínska 16, 917 24 Trnava, Slovak Republic |
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Abstract: | Mechanical and tribological properties of nanocomposites with silicon nitride matrix with addition of 1 and 3 wt.% of multilayered graphene (MLG) platelets were studied and compared to monolithic Si3N4. The wear behavior was observed by means of the ball-on-disk technique with a silicon nitride ball used as the tribological counterpart at temperatures 25 °C, 300 °C, 500 °C, and 700 °C in dry sliding. Addition of such amounts of MLG did not lower the coefficient of friction. Graphene platelets were integrated into the matrix very strongly and they did not participate in lubricating processes. The best performance at room temperature offers material with 3 wt.% graphene, which has the highest wear resistance. At medium temperatures (300 °C and 500 °C) coefficient of friction of monolithic Si3N4 and composite with 1%MLG reduced due to oxidation. Wear resistance at high temperatures significantly decreased, at 700 °C differences between the experimental materials disappeared and severe wear regime dominated in all cases. |
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Keywords: | Graphene Friction Wear |
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