Browsing by Author "Yalamac E."

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    Effects of surface finishing on the mechanical properties of induction welded iron based sintered compacts
    (Carl Hanser Verlag, 2014) Çavdar U.; Yalamac E.; Gülsahin I.
    In this study, iron based sintered parts were welded by high frequency induction welding. The effects of surface roughness on the mechanical properties of induction welded samples were investigated. Polished and unpolished samples were welded and mechanically tested by three point bending test. The hardness of the samples increased from the base material towards the weld metal. The weld metal, heat affected zone and the base material of the samples were investigated by light microscopy. In contrast to the polished samples, corrosion attack was registered in the welded region of unpolished samples. According to the results, the welding duration affects the mechanical properties. However, the surface finishing process was the dominant factor for the bending strength of the welded samples. © Carl Hanser Verlag GmbH & Co. KG.
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    Effect of olive mill waste addition on the properties of porous fired clay bricks using Taguchi method
    (Academic Press, 2016) Sutcu M.; Ozturk S.; Yalamac E.; Gencel O.
    Production of porous clay bricks lightened by adding olive mill waste as a pore making additive was investigated. Factors influencing the brick manufacturing process were analyzed by an experimental design, Taguchi method, to find out the most favorable conditions for the production of bricks. The optimum process conditions for brick preparation were investigated by studying the effects of mixture ratios (0, 5 and 10 wt%) and firing temperatures (850, 950 and 1050 °C) on the physical, thermal and mechanical properties of the bricks. Apparent density, bulk density, apparent porosity, water absorption, compressive strength, thermal conductivity, microstructure and crystalline phase formations of the fired brick samples were measured. It was found that the use of 10% waste addition reduced the bulk density of the samples up to 1.45 g/cm3. As the porosities increased from 30.8 to 47.0%, the compressive strengths decreased from 36.9 to 10.26 MPa at firing temperature of 950 °C. The thermal conductivities of samples fired at the same temperature showed a decrease of 31% from 0.638 to 0.436 W/mK, which is hopeful for heat insulation in the buildings. Increasing of the firing temperature also affected their mechanical and physical properties. This study showed that the olive mill waste could be used as a pore maker in brick production. © 2016 Elsevier Ltd
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    Preparation and characterization of anorthite ceramics from sugar production solid waste: a statistical analysis of grinding parameters
    (Springer, 2022) Kaya V.S.; Sutcu M.; Yalamac E.
    The purpose of the study was to investigate the possibility of using press filter cake (PFC) waste from sugar production in the preparation of anorthite ceramics. In this study, at first step, the properties of anorthite ceramic compositions produced using different proportions of press filter cake (PFC) as calcium oxide source and chamotte as aluminosilicate source were investigated. A single anorthite phase was obtained in samples containing high PFC ratios sintered at high temperature. In the second step, the PCH-35 (35% PFC plus 65% chamotte) ceramic composition was statistically analyzed to examine grinding parameters and sintering temperatures. This composition was ground and sintered at different parameters to investigate the effects on physical, mechanical, and morphological properties on anorthite ceramics. The results indicated that the anorthite phase formed in the powders sintered at 1200 °C and 1300 °C after grinding was the major phase. With increasing sintering temperature, grinding speed, and time, the samples exhibited lower porosity, higher bulk density, and compressive strength. With the sintering of the samples at 1200 °C, the percentage of apparent porosity decreased from 49.95 to 25%, while the bulk density value increased from 1.36 to 2.03 g/cm3 with increasing grinding speed and time. When the samples were sintered at 1300 °C, the percentage of apparent porosity decreased from 49.59 to 0.33%, while the bulk density value increased from 1.33 to 2.54 g/cm3 with increasing grinding speed and time. The compressive strength results (from 26 to 82 MPa) increased due to body densification with the effect of increasing sintering temperature, grinding speed, and time. © 2022, The Author(s) under exclusive licence to Australian Ceramic Society.