• MAHMUT CAN SENEL

      Articles written in Bulletin of Materials Science

    • Microstructure and wear behaviour of graphene–Si$_3$N$_4$ binary particle-reinforced aluminium hybrid composites

      MAHMUT CAN SENEL MEVLÜT GÜRBÜZ

      More Details Abstract Fulltext PDF

      In this study, Si$_3$N$_4$ and graphene-reinforced aluminium matrix composites (AMCs) with various contents (Si$_3$N$_4$: 1, 3, 6, 9 wt%; graphene: 0.1, 0.3, 0.5 wt%) were produced by the powder metallurgy method. The phase and microstructure analyses of the composites were performed by X-ray diffractometry and scanning electron microscopy, respectively. To investigate the tribological behaviour of Al–Si$_3$N$_4$ and Al–Si$_3$N$_4$–graphene composites, pin-on-disc experiments were conducted with different loads ($F = 10$, 20 and 30 N) at a constant sliding speed (200 rpm). Thus, the effects of Si$_3$N$_4$ and graphene contents on microstructure, Vickers hardness, apparent density, porosity, wear rate and friction coefficient of AMCs were investigated. Test results reveal that the highest Vickers hardness ($66 \pm 1$ HV), the lowest porosity (5.6%), wear rate ($3.1 \times 10^{−5}$ mm$^3$ N$^{−1}$ m$^{−1}$) and friction coefficient (0.13) were obtained for Al–9Si$_3$N$_4$–0.1 graphene. After attaining 0.1% graphene content, agglomeration was detected from the microstructure images of Si$_3$N$_4$–graphene reinforced AMCs. It was concluded that Si$_3$N$_4$ had an outstanding wear resistance and graphene was a good solid lubricantfor AMCs.

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