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

Yoshihiro Kusano, Teruaki Danno, Keiko Tokunaga, Nobuaki Kamochi, Hideki Hashimoto, Makoto Nakanishi, Tatsuo Fujii, Minoru Fukuhara, Jun Takada

Research output: Contribution to journalArticle

Abstract

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 50μm Al-substituted hematite (Fe1.9Al0.1O3) particles. The relationship between the microstructure of the phases formed and the color is discussed.

Original languageEnglish
Pages (from-to)942-946
Number of pages5
JournalNippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
Volume119
Issue number1396
Publication statusPublished - Dec 2011

Fingerprint

Corundum
Aluminum Oxide
Hematite
hematite
marking
aluminum oxides
ceramics
Color
color
microstructure
Microstructure
clays
Clay
glazes
porcelain
Glazes
Dental Porcelain
Crystals
Porcelain
Alkalies

Keywords

  • Corundum
  • Hematite
  • Hi-iro
  • Microstructure
  • Reddish color
  • Traditional ceramics

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry
  • Chemistry(all)
  • Condensed Matter Physics

Cite this

Microstructure and formation conditions of the reddish hi-iro marking on traditional Japanese ceramics. / Kusano, Yoshihiro; Danno, Teruaki; Tokunaga, Keiko; Kamochi, Nobuaki; Hashimoto, Hideki; Nakanishi, Makoto; Fujii, Tatsuo; Fukuhara, Minoru; Takada, Jun.

In: Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan, Vol. 119, No. 1396, 12.2011, p. 942-946.

Research output: Contribution to journalArticle

Kusano, Yoshihiro ; Danno, Teruaki ; Tokunaga, Keiko ; Kamochi, Nobuaki ; Hashimoto, Hideki ; Nakanishi, Makoto ; Fujii, Tatsuo ; Fukuhara, Minoru ; Takada, Jun. / Microstructure and formation conditions of the reddish hi-iro marking on traditional Japanese ceramics. In: Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan. 2011 ; Vol. 119, No. 1396. pp. 942-946.
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