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      저자 : G. Timellini (검색결과 2 건)
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        A new rheological model for the flow curve of porcelain stoneware slips containing nepheline syenite

        A. Salem,S.H. Jazayeri,E. Rastelli,G. Timellini 한양대학교 세라믹연구소 2010 Journal of Ceramic Processing Research Vol.11 No.1

        Rheological properties of commercial porcelain stoneware slip and compositions modified by nepheline syenite were studied at different milling times. Firstly, the investigation was focused on the effects of the content of nepheline syenite and the particle size distribution on the rheological properties. For this purpose, flow curve data and yield stresses were obtained for the porcelain stoneware slips using a rotational rheometer. It was found that the viscosity and yield stress of porcelain stoneware compositions significantly depend on the above parameters and a minimum viscosity is achieved when 10 wt.% nepheline syenite is added to the mix. The optimum milling time was determined for the modified composition which resulted in the best rheological properties. Finally, a new rheological model was developed for these types of slips using an hyperbolic function. The new model satisfactorily correlates the shear stress to the shear rate for the slips at different milling times. The results showed that the proposed model predicts the behavior of the flow curves, yield stress and infinite viscosity for the porcelain stoneware slips both with and without the yield stress.

      • KCI등재

        Effect of nepheline syenite on the colorant behavior of porcelain stoneware body

        A. Salem,S.H. Jazayeri,E. Rastelli,G. Timellini 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.5

        The effects of nepheline syenite on the colorant behavior of porcelain stoneware tiles were assessed with special reference to the body composition. Potassium feldspar was replaced by nepheline syenite in a typical porcelain stoneware body by up to 15.6 wt.%. Technological parameters such as shrinkage, water absorption and porosity were measured. Phase composition and microstructural characteristics were determined to understand the role of nepheline syenite in the whiteness of a ceramic body. The results show that nepheline syenite had a significant effect on the sintering rate and influences remarkably the sintering behavior, increasing the shrinkage and decreasing total porosity. On the other hand there is a decrease in the amounts of mullite and quartz with addition of nepheline syenite. The bodies richer in nepheline syenite show larger amounts of albite and glassy phase. These bodies also present a higher whiteness with the same sintering conditions. The colorant characteristics appear to be directly related to the free albite crystals content. In conclusion nepheline syenite can be used in small amounts, 5 wt.%, to obtain an effective color development. The effects of nepheline syenite on the colorant behavior of porcelain stoneware tiles were assessed with special reference to the body composition. Potassium feldspar was replaced by nepheline syenite in a typical porcelain stoneware body by up to 15.6 wt.%. Technological parameters such as shrinkage, water absorption and porosity were measured. Phase composition and microstructural characteristics were determined to understand the role of nepheline syenite in the whiteness of a ceramic body. The results show that nepheline syenite had a significant effect on the sintering rate and influences remarkably the sintering behavior, increasing the shrinkage and decreasing total porosity. On the other hand there is a decrease in the amounts of mullite and quartz with addition of nepheline syenite. The bodies richer in nepheline syenite show larger amounts of albite and glassy phase. These bodies also present a higher whiteness with the same sintering conditions. The colorant characteristics appear to be directly related to the free albite crystals content. In conclusion nepheline syenite can be used in small amounts, 5 wt.%, to obtain an effective color development.

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