고화도 Frit를 사용한 색유약의 발색 연구

Abstract

The purpose of this study is to evaluate the coloring of glazes by adding various kinds of coloring oxides to the basic glazes which were made of Frit. The experiment to find out the optimum composition recipe of basic glazes was performed using three basic mixtures such as, Frit-Indonesian Kaolin, Frit-Chungju Limestone-BaCO, and Frit-Chungju Limestone-Buyeo Quartz. Then, various coloring oxides, such as Fe2O3, CuO, MnO2, NiO, TiO2, Cr2O3, CoO, were added to the optimized basic glazes formulations. The firing condition of coloring glazes to prepare coloring test specimen in the electric kiln was maintained under oxidizing atmosphere. The final temperature of firing was set at 1,260 ℃ for thirty minutes, then it was cooled down by natural cooling system. To find out the effect of the individual coloring oxide compounds on coloring glazes, each coloring oxide was added by 1, 3, and 5 wt.% to the basic glazes formulations. The effect of combination of coloring oxides also examined with a series ofexperiments adding two coloring oxides with various ratios such as, 2:1, 1.5:1.5, and 1:2. The experimental result of our oxides coloring system shows that nice and profound coloring such as white, brown, green, and blue can be successfully achieved. We also examined the flowing behavior through the overlapping experiment of two coloring glazes. The flowing and mixing phenomena of two coloring glazes during firing resulted in very nice and beautiful coloring effects. In conclusion, we could get clean, wonderful, and profound coloring of color glazes using the glaze made of Frit with appropriate amount of coloring oxide compounds. We also found a world of fantastic glaze effects produced by flowing and mixing phenomena of two coloring glazes during firing that can be applied in tile and ceramic works.