Microstructure and formation conditions of the reddish hi-iro marking on traditional Japanese ceramics

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概要

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• The microstructure and conditions for the formation of the reddish color referred to as hi-iro on Japanese ceramics were investigated through model experiments. The hi-iro marking was found to be formed by the reaction between clay and alkali ions supplied from the glaze. When a mixture of porcelain clay and 20 wt % KCl was heated in air at 1250°C and then cooled slowly to 800°C, hi-iro clearly appeared on the sample surface. In hi-iro, corundum [α-(Al,Fe)2O3], hematite (α-Fe2O3) and a liquid phase are formed. Upon heating until 1250°C, corundum is firstly precipitated as hexagonal plate-like crystals. During the cooling process, hematite precipitates on the edges of the corundum crystals to form specific composite particles. When rapidly cooled from 1250°C to room temperature, a brownish red color appeared on the sample surface, which was found to be caused by the formation of approximately 50 µm Al-substituted hematite (Fe1.9Al0.1O3) particles. The relationship between the microstructure of the phases formed and the color is discussed.

著者

• Fukuhara Minoru

  Department Of Mechanical Engineering Faculty Of Engineering Kagoshima University

• Takada Jun

  Graduate School Of Natural Science And Technology Okayama University

• KAMOCHI Nobuaki

  Saga Ceramics Research Laboratory

• Kusano Yoshihiro

  Department Of Applied Arts And Design Kurashiki University Of Science And The Arts

• Kamochi Nobuaki

  Saga Ceramics Res. Lab.

• HASHIMOTO Hideki

  Graduate School of Natural Science and Technology, Okayama University

• NAKANISHI Makoto

  Graduate School of Natural Science and Technology, Okayama University

• DANNO Teruaki

  Graduate School of Natural Science and Technology, Okayama University

• TOKUNAGA Keiko

  Department of Applied Chemistry, Faculty of Engineering, Okayama University

• FUJII Tatsuo

  Graduate School of Natural Science and Technology, Okayama University

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