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    Fabrication and characterization of nanoceramic particle Al2O3/B4C composite by mechanochemical approach
    (Taylor & Francis Inc, 2017) Gokmese, Hakan; Bostan, Bulent; Baris, Mustafa
    Al2O3/B4C ceramic phase composite structure was produced by solid-state method. Transformations of ceramic phases, micromorphology were determined by employing X-ray diffraction, FT-IR, scanning electron microscopy and transmission electron microscopy (TEM). Transformation of ceramic phases was completed in a short time (6 h). Formation of Al2O3/B4C ceramic-phase powder mixtures was specified after leaching. As a result of the increase of mechanical energy and the amount of ceramic phase, reduction in powder particle size (50-350 nm) and increase in agglomeration tendency were observed. The impurities were removed after leaching and the distribution in which the ceramic phases are effective was obtained with the TEM study.
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    Fabrication and characterization of nanoparticle MgO/B4C composite by mechanochemical method
    (Sage Publications Ltd, 2017) Gokmese, Hakan; Bostan, Bulent
    In this study, nanoparticle boron carbide was produced after the reduction of boron oxide with magnesium under the presence of carbon by using mechanochemical synthesis method. During the synthesis processing, microstructure and phase transformations of powders were performed by using X-ray diffraction (XRD), Fourier-transform infrared spectrum (FT-IR), scanning electron microscope (SEM), and high-resolution transmission electron microscopy (HRTEM). At the end of 2h, reaction products (MgO, B4C) were determined by XRD and FT-IR examinations. Nanoparticle B4C single-phase crystalline structure from the MgO/B4C composite powder mixture, which was the reaction product, was obtained by leaching process. With the increase in the synthesis period, starting material peaks diminished and Fe peak intensity became evident. After the HRTEM examinations, it was determined that synthesized B4C particles were within range of 10-200 nm especially in the activation of leaching process. Additionally, by using spot pattern analysis method, planes represented by B4C particles were calculated.
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    PRODUCTION OF ELECTRO PORCELAIN REINFORCED WITH BORIC ACID AND INVESTIGATION OF ITS PROPERTIES
    (Gazi Univ, Fac Engineering Architecture, 2015) Bilgin, Aziz Emre; Gokmese, Hakan; Bostan, Bulent
    The need of electrical energy is raised by the development of industry and that required to transportation of energy to the more distant points. All these developments reveal the need of cheaper insulator production and the need of enhancement of insulators' technical specifications and mechanical resistance against the increasing mains voltage and external factors. In the study, three different prescriptions, contain 0.1 %, 0.3 % and 1% H3BO3 additive, were prepared. Then, prepared samples were shaped on vacuum presses in the laboratory. After samples were dried, they were sintered at 1255 degrees C for 2 hours in air. Particle size distribution, dry refinement, fuchsine and bending three point tests were applied to the samples. Characterizations of microstructure were performed by XRD, SEM and EDS analyses. At the end of the experimental studies, it was seen that depending on additive percentage, the reduction of particle size distribution is up to 0.3% and particle size is increasing with an increase in additive ratio. The maximum dry reduction amount was seen on the sample that contains 1 % boric acid. In general, it was determined that the sample, which contains 0.3 % boric acid, gives closer results to operation conditions. Therefore, it was observed that the boric acid could be an alternative raw material source, if it is incorporate into electro-ceramic at a certain ratio.