Browsing by Author "Gezici L.U."

Now showing 1 - 3 of 3
  • No Thumbnail Available
    Item
    The mechanical and tribological characteristic of Aluminium-Titanium dioxide composites
    (CSIC Consejo Superior de Investigaciones Cientificas, 2018) Gezici L.U.; Gül B.; Çavdar U.
    The purpose of this work was to investigate the mechanical and tribological effects of Titanium dioxide (TiO2) reinforcement in Aluminium (Al). Aluminium composites consist of 99.8% pure aluminium reinforced with five different partions of TiO2. Aluminium powders were mixed with TiO2 by ball milling for 30 minutes in a planetary mixer. The powder mixture was compacted by the cold pressing technique at 250 MPa. Two different methods used for sintering. The green compact was sintered at 600 °C for 300 seconds in open atmosphere with an Ulta-High Frequency Induction System (UHFIS) and with furnace at 600 °C for 1800 seconds. The mechanical and microstructural properties of examples were compared for different amount of reinforcement. We have observed a maximum hardness for 5 wt.% TiO2 reinforced composites. © 2018 CSIC.
  • No Thumbnail Available
    Item
    Microstructural properties and tribological behaviours of ultra-high frequency induction rapid sintered Al-WC composites; [Propiedades microestructurales y comportamiento tribológico de composites Al-WC sinterizados mediante inducción rápida a ultra alta frecuencia]
    (CSIC Consejo Superior de Investigaciones Cientificas, 2020) Çavdar U.; Gezici L.U.; Gül B.; Ayvaz M.
    In this study, sinterability of 1, 3, 5, 9 and 15 wt.% WC reinforced aluminum matrix composite samples by induction fast and conventional sintering methods was investigated. For this purpose, firstly, it was pressed by unaxial cold pressing method under 200 MPa pressure. Some of these raw samples were sintered by ultra-high frequency induction fast sintering method at 600 °C temperature for 300 sec., while the other part of the samples were sintered by 600 °C for 1800 sec. The density and hardness values of sintered composite samples were measured and microstructural properties, abrasion and friction behaviours were investigated. In this study, it was seen that increased WC reinforcement ratio and abrasion resistance and friction coefficient increased together. In addition, this study showed that ultra-high frequency sintering is as successful as traditional method in Al-WC composite production. Copyright: © 2020 CSIC.
  • No Thumbnail Available
    Item
    The effect of SiC content on microstructural and tribological properties of sintered B4C and SiC reinforced Al-Cu-Mg-Si matrix hybrid composites
    (Walter de Gruyter GmbH, 2022) Gezici L.U.; Özer E.; Sarpkaya I.; Çavdar U.
    In this study, B4C and SiC hybrid reinforced Al-Cu-Mg-Si alloy Matrix composites were fabricated using a microwave sintering technique at a sintering temperature of 550 °C for 60 min. In the produced hybrid composites, while the B4C ratio was kept constant (3 wt%), SiC was used in four different amounts (3, 6, 9, and 12 wt%). In these produced hybrid composites, as a result of microwave sintering, thanks to the high microwave absorption of SiC, the porosities closed at a rate of 36.65-40.90%. In 3, 6, 9, and 12 wt% SiC reinforced composites, the microhardness of 100.1, 106.8, 114.4, and 117.2 HV0.05 were achieved, respectively. Due to agglomeration increasing with SiC reinforcement rate, delamination wears increased in 12 wt% SiC reinforced hybrid composite. As a result, the lowest specific wear rate was measured as 0.3374 × 10-3 mm3·(Nm)-1 in the 3 wt% B4C+9 wt% SiC reinforced sample. © 2022 Walter de Gruyter GmbH, Berlin/Boston.