Yazar "Sandik, Mustafa Hakan" seçeneğine göre listele

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    Öğe
    Fabrication of composite polymers with micron size copper and graphite additives in masked stereolithography
    (Springer Heidelberg, 2024) Kaya, Ali Can; Sandik, Mustafa Hakan; Temiztas, Birguel Ascioglu
    Masked stereolithography makes the fabrication of complex parts more effortless and less expensive and enables high surface quality. We fabricated pure resin, flexible resin, resin-6.1-wt% graphite, and resin with Cu concentrations spanning from 5.5 to 15.5 wt% at different printing conditions. The structure was investigated with electron and light microscopes, and tensile testing of the printed sample was carried out. Resin temperature, post-curing temperature, and time are the dominating factors determining the strength of printed samples. Resin-Cu composite depicted a strengthening effect at 10 degrees C degrees resin and post-curing temperatures, but no strengthening effect was found for flexible resin-Cu composite at 20 degrees C degrees. Cu particles agglomerated, forming a density-graded composite; however, graphite particles distributed more homogenously in the parts. Increasing the graphite gradually reduces the composite strength. As a result, the mechanical properties of the composites are dominated by the interaction between the fillers and the matrix.
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    Öğe
    Synthesizing of Syntactic A356 Foams Using Vibration-Assisted Gravity Die Casting
    (Springer Int Publ Ag, 2025) Kaya, Ali Can; Ozturk, Mursel Erkin; Isik, Ali Gokberk; Erdogan, Irem; Sandik, Mustafa Hakan
    The casting of Al (A356) syntactic foams with recycled expanded glass spheres has been carried out using a custom-made steel mold. The vibration motor was integrated into the mold to investigate the influence of the vibration on the microstructure, corrosion, and mechanical properties. Vibration increased the SDAS (Secondary dendrite arm spacing) and eutectic Si size on the micro-scale. The strength and hardness of the foams were increased. Furthermore, vibration improved the corrosion resistance of the matrix material by 1.3 times compared to non-vibrated cast foams. The distribution of the glass spheres was also influenced by vibration: (i) Density-graded structure observed in vibration-assisted casting, (ii) homogenous distribution was found in the non-vibrated cast foam. The distribution of the sphere particles in the structure dominated the deformation mode: A layer-by-layer deformation occurred in the vibrated samples, and a diagonal fracture was observed in the non-vibrated samples. In conclusion, the vibration heavily influenced the meso-micro-structures and improved the mechanical and corrosion properties.