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    Corrosion behaviours of high Cr-Ni cast steels in the HCl solution
    (Elsevier Science Sa, 2010) Bulbul, Saban; Sun, Yavuz
    In this study, the effect of composition and heat treatment (aging) on the corrosion resistance of high alloy steels containing 0.4% C, 29% Cr and 4-20% Ni has been investigated. Aging heat treatment was composed of quenching after holding at 1200 degrees C for 6 h and aging at 750 degrees C for 18 h. Corrosion tests were performed by suspending the samples of certain sizes into the 10% HCl solutions measuring the weight loss, and also by potentiodynamic polarization measurements in the same solution. The results of the corrosion tests revealed that, corrosion resistance of the aged alloys was increased with increasing Ni content. On the other hand, corrosion resistance of the austenitic matrix alloys was increased upon aging heat treatment while that of ferritic matrix alloy decreased with aging. (c) 2010 Elsevier B.V. All rights reserved.
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    Effect of Changing of Filling Materials in NR-SBR Type Elastomer Based Rubber Materials on Mechanical Properties
    (Polymer Soc Korea, 2014) Bulbul, Saban; Yasar, Mustafa; Akcakale, Nuretttin
    The effects of different filling materials and stabilizers in polymer based materials that are used as shoe soles in the shoemaking industry on the mechanical properties (strength, failure, tensile, tearing, bending etc.) of the final products have been examined in this study. Natural rubber (NR RSS3) and styrene-butadiene rubber (SBR 1502) were used as the main matrix material. New compounds were formed by replacing the fillings in the general compound of the existing factory (SiO2, CaCO3) with 40% (1200 g) blast furnace flue dust, rice husk, reclaimed rubber (recycled) and wood ash. Comparison of the new compounds with the existing compounds revealed a decrease in hardness, density, dimension stability, bending, tearing, % elongation and failure strength and an increase in wearing.
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    THE EFFECT OF WOOD ASH ON THE MECHANICAL PROPERTIES OF RUBBER COMPOUNDS
    (Inst Za Kovinske Materiale I In Tehnologie, 2019) Bulbul, Saban; Akcakale, Nurettin; Yasar, Mustafa; Gokmese, Hakan
    In this study, the effect of adding wood ash (oak tree) on the mechanical properties (tensile, abrasion, tearing, elongation %, etc.) of NR/SBR-type elastomer materials was investigated. Five different compounds were prepared by adding 16 %, 32 %, 48 % and 64 % wood ash to the filler and additive materials in the general composition (G). The mechanical test results and production costs of the new compounds composed were compared between themselves and with the G compound. The fracture surfaces of the compounds as well as the shape and morphological distribution of the fillers in the rubber matrix were examined using a Scanning Electron Microscope (SEM). As a result of the experimental studies, it was found that the new compounds composed had an increased tensile and tearing strength. abrasion amounts, bending capability, unit elongation amounts and densities in comparison to the G compound. A decrease was observed in the hardness values and material costs (production cost) of the compounds.
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    Investigation of Obtaining Natural Humic Acid From Asphaltites Commonly Found in Sirnak-Uludere Region
    (Gazi Univ, 2022) Taskesen, Edip; Acar, Sukru; Arli, Fatih; Dumrul, Hakan; Ertugrul, Gorkem; Bulbul, Saban; Ozcan, Emine
    The physical and chemical properties of asphaltites found in significant amounts in Sirnak and its surroundings are close to coal. But it differs from coal because of its formation sources and chemical processes. Asphaltites were separated from the oil in liquid state by tectonism and settled in other locations, hardened by chemical reactions during geological processes and turned into solid phase. Most of the heating need in the Southeastern Anatolia Region is met by asphaltites. However, it is a raw material with low calorific value, high content of ash, sulfur and moisture, and high potential to adversely affect air pollution.It contains nitrogen and humic acid that dissolves slowly in aqueous media and can be used as soil reinforcement. In this study, researches were made to obtain natural humic acid from the content of asphaltite samples taken from the mine reserve in Uludere district. In the experiments made with samples, the effects of pH changes, temperature changes, changes in mixing times, precipitation in KOH and HCl solution were investigated towards optimal humic acid recovery efficiency. Accordingly, natural humic acid was obtained with the highest efficiency of 33.95% as a result of the studies conducted with temperature experiments from the sample of the Uludere region.