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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, AtamerNepheline 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.Öğe The Effect of Nepheline Syenite Addition on the Sintering Behaviour of Sanitaryware Bodies(Australian Ceramic Society, 2016) Kunduraci, Nazim; Aydin, Tuna; Akbay, AtamerIn 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.
