SEARCH RESULT

Hybrid composites are materials that have a combination of two or more reinforcements. These materials have extensive engineering applications that have a low strength/density ratio, low cost and ease of manufacturing. Hybrid composites provide a combination of properties such as tensile modulus, compressive strength and impact resistance, which cannot be realized in composite materials. The surface properties of the materials must be improved against corrosion and wear. It is therefore essential and important that the coating layer has both wear and corrosion resistant phases. In this study, the surface of AISI 316L stainless steel is coated with metal powder having different composition by tungsten inert gas (TIG) welding surface coating method. Ti, B4C and SiC metal powders of different ratios were used as coating powder. The corrosion properties of coated samples were characterized by potentiostatic polarization test. Corrosion test results showed that corrosion properties vary depending on the coating components.

International Iron & Steel Symposium
UDCS

Serkan Islak Mehmet Akkaş Cihan Özorak Aytekin Ulutaş

Copper, which is known to have very good electrical and thermal conductivity, has poor mechanical properties. In order to overcome this negativity, the production of coppermatrix composites is becoming increasingly popular. In this study, copper (Cu) matrix ferrochromium (FeCr) and ferroboron (FeB) reinforced composites were produced. Cold pressing and sintering process were preferred as production methods. Microstructure and phase composition of the composites were examined by using scanning electron microscope (SEM). Hardness properties were carried out microhardness device. Also, Densities of composites were studied. SEM images showed that FeCr and FeB reinforcements were partially homogeneously dispersed in the Cu matrix. In the presence of FeCr and FeB in the Cu matrix, the hardness of the Cu matrix was considerably increased.

International Iron & Steel Symposium
UDCS

Mehmet Akkaş Serkan Islak Uğur Çalıgülü Mustafa Boz

In this study, Cu–Mo composite coatings were produced on copper substrate by plasma spray technique. Electrical conductivity and microstructure 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. Although the electrical conductivities of the coatings are very small compared to the substrate, it has been determined that the coatings exhibit a very good hardness values in comparison to the substrate.

International Symposium on Light Alloys and Composite Materials
UHAKS

Serkan Islak Uğur Çalıgülü Husain R.H. Hraam Cihan Özorak Vahdettin Koç

After the implantation of a biomaterial, it is exposed to mechanical loads and body fluids continuously or periodically according to the implantation area. Hence, the most important expectancy of biomaterials is to be biocompatible; not to cause a reaction or impede natural growth of the tissue, bone and organ. Ceramic materials with excellent mechanical, corrosion and abrasion resistance is set in terms of features such as biomaterials. In this study, ceramic coatings were produced on AISI 316L stainless steel by the plasma spray method. It was aimed to investigate microstructure 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 analysing cytotoxicity and viability.

International Symposium on Light Alloys and Composite Materials
UHAKS

Serkan Islak Nuray Emin Cihan Özorak Husain R.H. Hraam

During the cutting process, this arc occasionally occurs between the throttle nozzle and the electrode and is distorted in the form of the exit hole of the plasma for other reasons. Distortion in the form of the plasma flow hole disturbs the plasma arc and the compressed air flow surrounding the plasma arc, which in turn affects the cutting quality negatively. In this study, we investigated the possibility of reusability(recycling) by filling the wear parts of worn down nozzles with silver containing solders. For this purpose, the wear zones were machined to a diameter 6 mm and a depth of 3 mm, and then solder fillings containing silver were made on the region discharged by oxy-gas flame. The filling area was machined by original drilling with a diameter of 1.6 mm. Throttle nozzle filled with solders containing silver, 2%, 20% and 40% were used for cutting 5 mm thick sheets. Cutting operations of 1 meter length were carried out at a cutting speed of 1 m/min at a current of 50 amperes and a material loss per 10 meters was measured weight and geometrically. The results obtained were compared with the material losses in the copper throttle nozzles.

International Conference of Advanced Materials and Manufacturing Technologies
ICAMT

Ozkan Eski Ayse Yayli Eyuboglu Serkan Islak

In this study, the effects of boron carbide (B4C) addition on mechanical and physical properties such as microstructure, hardness and density of hot pressed copperboron carbide (Cu-B4C) composites were investigated. To improve the mechanical properties of commercial copper (C) powders having a particle size of 40μm, B4C having a particle size of 40μm, of 2,5, 5, 7,5, 10% by weight was added. Cu-B4C composites were sintered to argon atmosphere at 6500C, 7500C and 8500C for 4 minutes. The electrical conductivity values of the sintered products were measured after examination with the presence of B4C, optical microscope, X-ray diffraction analysis technique and SEM-EDS. In the images obtained, B4C was found to be homogeneously dispersed in the copper matrix. As the ratio of B4C increased, the hardness of the composites increased and the density decreased.

International Conference of Advanced Materials and Manufacturing Technologies
ICAMT

Ozkan Eski Serkan Islak Cigdem Urayli