Yazar "Kunduraci, Nazim" seçeneğine göre listele

Listeleniyor 1 - 3 / 3
  • Küçük Resim
    Öğe
    The Effect of Nepheline Syenite Addition on Pyroplastic Deformation of Sanitarywares
    (Int Inst Science Sintering (I I S S), 2018) Aydin, Tuna; Kunduraci, Nazim; Akbay, Atamer
    Nepheline syenite is used instead of feldspars as fluxing in ceramics. In this study, three ceramic bodies were prepared. Nepheline syenite was substituted by Na feldspar in the ratio of maximum 30 wt.%. The pyroplastic deformation was evaluated together with technological properties, including linear shrinkage, water absorption and strength. Phase and microstructural characteristics were also investigated. Results showed that the addition of nepheline syenite provided a decrease in viscosity. The decrease in viscosity caused an increase in the tendency for pyroplastic deformation in bodies containing nepheline syenite; however, this result shows that bodies containing nepheline syenite can be sintered at a lower temperature than the standard body. The addition of nepheline syenite also decreased water absorption and increased strength.
  • Küçük Resim
    Öğe
    The Effect of Nepheline Syenite Addition on the Sintering Behaviour of Sanitaryware Bodies
    (Australian Ceramic Society, 2016) Kunduraci, Nazim; Aydin, Tuna; Akbay, Atamer
    In this study, the effect of nepheline syenite addition on the sintering and material properties of sanitaryware porcelain bodies was investigated. Three ceramic sanitaryware bodies were prepared by substituting Na feldspar (max. 30 wt %) with nepheline syenite. The sintering behaviour was evaluated using an optical dilatometer. Samples were sintered at 1300 degrees C using step-by-step processing. In addition the linear shrinkage, water absorption and bending strength were measured. Results showed that the addition of nepheline syenite enhanced the material properties of sanitaryware bodies, had a positive effect on the formation of the liquid phase during sintering and improved overall the sintering and mechanical properties.
  • [ X ]
    Öğe
    Investigation of the effect of type and grain size of feldspar on thermal properties of ceramic sanitaryware
    (Springer, 2023) Gunbay, Asli Aydin; Kunduraci, Nazim; Aydin, Tuna; Sari, Hasan
    Ceramic sanitaryware products are produced using inorganic and non-metallic raw materials such as clay, kaolin, quartz and feldspar at certain rates. After mixing and grounding process, the slip is obtained. The products are shaped in gypsum or synthetic resin moulds. Green bodies are fired at 1250 & DEG;C for 16-18 h, and their water absorption values are less than 0.5%. Nowadays the most important issues are raw materials and energy costs. In this study, the sintering behaviour of Na-feldspar and K-feldspar, which are widely used in ceramic sanitaryware, is analysed by reducing to different grain sizes. The grain sizes of the samples containing Na-feldspar were reduced under 63 & mu;m. It was found that the decrease in grain size of Na-feldspar contributed to the decrease in sintering temperature. Potassium feldspar was also added instead of Na-feldspar in order to develop deformation behaviour at higher temperature. The increase in the amount of K-feldspar contributed to the decrease in deformation values. However, the flexural strength of the bodies decreased. A decrease in grain size of Na-feldspar resulted in a reduction of 10 & DEG;C at the sintering temperature. The decrease in sintering temperature will provide a cost advantage of around 3%. It was also found that technical properties such as firing shrinkage, bulk density, and flexure strength increased as the grain size of Na-feldspar decreased.