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全令五,李秉夏 명지대학교 산업기술연구소 2008 産業技術硏究所論文集 Vol.27 No.-
To study the coloring on the range on the Irabo glaze of pine tree ash and oak tree ash, 2-and 3-components compositions are researched. And the coloring range of Irabo glaze and the coloration characteristics with the sample testing materials such as feldspar and potterystone are analyzed. As the fluxes, Pinetree ash, oaktree ash and limestone[ CaO glaze group ], beanchaff ash [ magnesia glaze group ] were used and detected the difference of the characteristics of glaze within the coloring range of Irabo. with these, the same procedure was applied to natural mineral 1imestone[CaC0_(3) ] to compare the differences with natural ash which has similar components. Iron(Fe2O_(3) ) as metal oxide and field clay and loess as the natural material were used as color formers, each of which were added with different content ratio. During the repetative process of gathering and scattering in fire, the glaze became more fluid when it was more influenced by strong alkali, which means that the generation of Irabo glaze has an intimate relation with the melting quality. We found out that the range of Irabo generation is broader whithin the feldspar-ash, potterystone-ash binary system than the fe1dspar^(+) potterystone-ash-silica ternary system. Further, the Irabo color formation and flow were more serene and soft in potterystone than feldspar. And within the ternary system, loess mixed with 5% iron and 4% fieldclay made a softer and milder galze when it was used as a break material than as a color former.