Browsing by Author "Serkan Islak"

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    TRDizin
    Electrical conductivity, microstructure and wear properties of Cu-Mo coatings
    (2019-06-01) Vahdettin Koç; Husain R.H. Hraam; Cihan Özorak; Uğur Çalıgülü; Serkan Islak
    In this study, Cu–Mo composite coatings were produced on copper substrate byplasma spray technique. Electrical conductivity, microstructure and wearproperties of the composite coatings were investigated. Microstructure andphase composition of the coatings were examined by using optical microscopy(OM), scanning electron microscope (SEM), X-ray diffraction (XRD), and energydispersive X-ray spectroscopy (EDS). The microhardness experiments were alsoperformed by using a microhardness machine. The electrical conductivityproperties of the coatings were evaluated with eddy current instruments. Weartests were performed by pin-on-disc method. Although the electricalconductivities of the coatings are very small compared to the substrate, it hasbeen determined that the coatings exhibit very good tribological property andhigh hardness in comparison to the substrate.
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    TRDizin
    Microstructure, hardness and biocompatibility properties of ceramic based coatings produced by plasma spray method
    (2019-06-01) Cihan Özorak; Husain R.H. Hraam; Serkan Islak; Nuray Emin
    Ceramic materials with excellent mechanical, corrosion and abrasion resistanceis set in terms of features such as biomaterials. In this study, Al2O3, Al2O3-40%TiO2, ZrO2 - 8% Y2O3 and Cr2O3-2% TiO2 ceramic coatings were produced byplasma spraying on AISI 316L stainless steel surface. It was aimed to investigatemicrostructure, hardness and biocompatibility properties of coatings. Scanningelectron microscope (SEM) analysis and X-ray diffraction (XRD) phase analysiswere used to determine the microstructure and phase composition properties.The biocompatibility properties of coatings have been tried to be determined byanalyzing cytotoxicity and viability. The SEM images show that the ceramiccoatings are connected in accordance with the substrate. The XRD analyzes showthe formation of binary and ternary complex phases in the coating layers. Cr2O3-2% TiO2 coating has the highest hardness in the coating layers. Biocompatibilitytests reveal the most compatible and consistent results in terms of cytotoxicitywere obtained with Al2O3-40% TiO2 coating.