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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.119  No.1396 (December) (2011)  >  pp.942-946

Journal of the Ceramic Society of Japan
<<Previous article Vol.119  No.1396 (December) (2011)   pp.942 - 946 Next article>>

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

Yoshihiro KUSANO1), Teruaki DANNO2), Keiko TOKUNAGA3), Nobuaki KAMOCHI4), Hideki HASHIMOTO2), Makoto NAKANISHI2), Tatsuo FUJII2), Minoru FUKUHARA5) and Jun TAKADA2)
1) Department of Fine and Applied Arts, College of the Arts, Kurashiki University of Science and the Arts
2) Graduate School of Natural Science and Technology, Okayama University
3) Department of Applied Chemistry, Faculty of Engineering, Okayama University
4) Saga Ceramics Research Laboratory
5) Department of Applied Chemistry and Biotechnology, Faculty of Engineering, Okayama University of Science


  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.


Keyword:
Traditional ceramics, Reddish color, Microstructure, Hematite, Corundum, Hi-iro

Received: May 30, 2011
Accepted: September 29, 2011 , Published online: December 01, 2011
Copyright (c) 2011 The Ceramic Society of Japan

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