還元雰囲気が鉄釉の発色に及ぼす影響

概要

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A glaze composition with the Segel formula of 0.30(K, Na)2O⋅0.70BaO⋅0.45Al2O3⋅4.00SiO2 containing 1.0wt% Fe2O3 was treated in a reducing atmosphere (N2+10% CO) from 600° to 1200°C for various times, and fired at 1250°C in N2. The effect of reducing atmosphere on the coloration of the iron glaze was studied by chemical analysis, color analyzer and ESR. Results are summarized as follows; (1) When the glaze was reduced below 1000°C, the reduction proceeded before the melting of the glaze. The reduction ratio in the glaze (Fe2+/(Fe2++Fe3+)) increased with increasing temperature. As the reduction ratio increased, the color changed from light green tinged with yellowish brown to light blue, dark green tinged with yellowish brown and black at 100% reduction. The black color was assumed to arise from colloids of both iron metal and iron oxide compounds like hercynite dispersed in the glaze. (2) When the glaze was reduced at 1100°C, reduction and melting proceeded simultaneously, and the color changed into light blue or blue even above 90% reduction. (3) When the glaze was reduced at 1200°C, the reduction proceeded very slowly because of decreased surface area with melting of the glaze. Thus, the color turned light green tinged with yellowish brown.
社団法人日本セラミックス協会の論文
1987-07-01