Browsing by Author "Hraam H.R.H."

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Electrical conductivity, microstructure and wear properties of Cu-Mo coatings
(2019-06-01) Islak S.; Çalıgülü U.; Hraam H.R.H.; Özorak C.; Koç V.
In this study, Cu–Mo composite coatings were produced on copper substrate by plasma spray technique. Electrical conductivity, microstructure and wear properties of the composite coatings were investigated. Microstructure and phase composition of the coatings were examined by using optical microscopy (OM), scanning electron microscope (SEM), X-ray diffraction (XRD), and energy-dispersive X-ray spectroscopy (EDS). The microhardness experiments were also performed by using a microhardness machine. The electrical conductivity properties of the coatings were evaluated with eddy current instruments. Wear tests were performed by pin-on-disc method. Although the electrical conductivities of the coatings are very small compared to the substrate, it has been determined that the coatings exhibit very good tribological property and high hardness in comparison to the substrate.
Microstructural and Mechanical Properties of Ti-B4C/CNF Functionally Graded Materials
(2022-10-01) Gariba A.M.M.; Islak S.; Hraam H.R.H.; Akkaş M.
This study aims to investigate the microstructural and mechanical properties of titanium (Ti) matrix boron carbide (B4C) + carbon nanofiber (CNF)-reinforced functional-graded materials (FGMs) produced using the powder metallurgy method. B4C was added to the Ti matrix at different rates, namely, 5, 10, and 15% by volume, and CNF was added at a rate of 0.5% by volume. The effect of B4C and CNF on the properties of these composite layers was then investigated. In addition, the mechanical properties of the FGMs were compared with the mechanical properties of non-layered structures. In addition, the microstructural, phase formation, hardness, and transverse rupture strength properties of the samples were investigated in detail. The microstructural investigation revealed that the B4C and CNF were homogeneously distributed throughout the Ti matrix and that the layers had bonded properly. With the addition of B4C and CNF, the hardness of the materials increased significantly. The transverse rupture strengths of the FGMs were higher than those of the non-layered samples (with the exception of pure Ti), indicating that the middle layers increased the toughness of the materials.
Microstructure and Mechanical Properties of Ti-Cu-Based Materials Produced by Using Reactive Melt Infiltration and Liquid Phase Sintering Techniques
(2023-08-01) Hraam H.R.H.; Islak S.; Gariba A.M.M.
Microstructure, hardness and biocompatibility properties of ceramic based coatings produced by plasma spray method
(2019-06-01) Islak S.; Emin N.; Özorak C.; Hraam H.R.H.
Ceramic materials with excellent mechanical, corrosion and abrasion resistance is 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 by plasma spraying on AISI 316L stainless steel surface. It was aimed to investigate microstructure, hardness and biocompatibility properties of coatings. Scanning electron microscope (SEM) analysis and X-ray diffraction (XRD) phase analysis were used to determine the microstructure and phase composition properties. The biocompatibility properties of coatings have been tried to be determined by analyzing cytotoxicity and viability. The SEM images show that the ceramic coatings are connected in accordance with the substrate. The XRD analyzes show the formation of binary and ternary complex phases in the coating layers. Cr2O3-2% TiO2 coating has the highest hardness in the coating layers. Biocompatibility tests reveal the most compatible and consistent results in terms of cytotoxicity were obtained with Al2O3-40% TiO2 coating.