سال انتشار: ۱۳۸۷
محل انتشار: دومین کنگره بین المللی علوم و فناوری نانو
تعداد صفحات: ۲
M Hosseini Zori – Department of Inorganic Pigments and Glazes, Institute for Colorants, Paint and Coatings
P Hakami – Department of Material Engineering, Faculty of Ceramic, University of Islamic Azad, Saveh Branch
In the production of colored ceramic materials, the coloring ions can play their roles by being dissolved in the material which we intend to color, ceramic body or glaze. The coloring effect can also be provided by reaction between the coloring ions in the furnace to obtain the appropriate coloring particles, as in the case of the dispersion of colloidal metallic Cu red colors. These red colors are obtained by reducing the appropriate Cu(I) salt, in a previous oxidation stage in order to control the size of the colloidal particles involved. Should these particles be too small, yellow colors instead of reds are produced [1, 2].Both of these alternatives do not appear to be recommendable in industrial productions, since the solution and or reduction processes involved are rather difficult to control and a good reproducibility must always be guaranteed in industrial production. Instead of these procedures, calcined or synthetic pigments are being widely used in the ceramic industry; in these calcined pigments, the color agent has already been incorporated into an appropriate host lattice during the calcination stage by some kind of reaction. Of course, the host lattice must have adequate thermal stability and must remain insoluble to withstand the aggressive action of the glazes (ceramic frits and or sintering additives) in which they are formulated. Base on glaze formulate, some pigments will be useful to apply.The inclusion or encapsulation of a reactive, colored or toxic crystal into a highly stable crystalline matrix gives a protection effect to the guest crystal by the host crystal. The guest crystal becomes inactive within the host .Among synthetic inorganic ceramic pigments, to be used in the ceramic industry, there is a restricted choice for red/pink and orange colors. These are generally easily etched by glasses, can be sensitive to the atmosphere and firing temperatures and a number of them contain toxic and pollutant elements. Therefore in recent years, there has been a developing interest toward new nontoxic inorganic red pigment and apply them into ceramic glazes [3-4].Based on these considerations, the aim of the present work was to study the optimization of ceramic glaze for applications of synthesized red inorganic nanocomposite inclusion pigments.