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Katsuki H.,Saga Ceramics Research Laboratory SCRL | Kamochi N.,Saga Ceramics Research Laboratory SCRL | Kawahara A.,Saga Ceramics Research Laboratory SCRL | Kajihara Y.,Ohtani Tobo
Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan | Year: 2013

Clays for Karatsu ware were prepared from ground three sandstones by a stamp-milling and elutriation processes. The chemical and mineralogical properties were studied and compared with those of Amakusa pottery stones for Arita porcelain. Karatsu clays were composed of α-quartz, feldspar and kaolin minerals without sericite, and the mineral composition of normative α-quartz, feldspar and kaolin were 38-48, 26-37, 17-31 mass%, respectively. Coarse particles in Karatsu clays were angular and rough in shape, and had a very broad particle size distribution. Average particle sizes of coarse particles were 24-29 μm, and maximum particle size were 160-260 μm, respectively. Average particle size of coarse particles was four to five larger than that of Amakusa pottery clay. © 2013 The Ceramic Society of Japan. All rights reserved. Source


Katsuki H.,Saga Ceramics Research Laboratory SCRL | Kawahara A.,Saga Ceramics Research Laboratory SCRL | Kamochi N.,Saga Ceramics Research Laboratory SCRL | Pee J.-H.,Saga Ceramics Research Laboratory SCRL | And 5 more authors.
Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan | Year: 2014

Four sedimentary clays for Karatsu ware which were geologically derived from the weathered sandstone and granite were mined and used in this study. The chemical composition, mineral composition and morphology of minerals were investigated by XRF, XRD, SEM and TEM analysis. The mineral composition of normative ¡-quartz, feldspar and kaolin of two clays were 43.1, 4.7, and 44.3, and 52.1, 21.3, and 27.0, respectively. These clays had lower content of feldspar and higher content of kaolin than those of clays prepared from some sandstone for Karatsu ware. Average size of coarse particles in four clays was 2228 ¯m and maximum particle size were 188290 ¯m, and these sizes were similar to those of clays prepared from sandstone. It was suggested that the decomposition of feldspar to sericite and kaolin was promoted by the weathering and hydrolysis of sandstone or granite. © 2014 The Ceramic Society of Japan. All rights reserved. Source

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