| Investigation for Materials of Old Porcelain Wares in Houhoku-town |
| Natsuki HOSOYA |
| Yamaguchi Prefectural Industrial Technology Institute |
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Keywords: Porcelain wares, Houhoku-town, X-ray fluorescence spectroscopy
1. Introduction
Houhoku-town locates in the western part of Yamaguchi prefecture in Japan. From the late 1700¡¯s to early 1900¡¯s, there were some manufacturing porcelain kilns such as Nakabara-kiln, Sakaige-kiln, Iinoyama-kiln and Hara-kiln in this town. However, none of them exists any longer and there is less information about these porcelain wares.[1] Folklore said these porcelain wares were made by using some raw materials which was reserved and mined in Houhoku-town.[2] In this study, for the purpose of investigating these materials, we analyzed the mineral composition of six raw materials which is possibly used in old porcelain wares in Houhoku-town. Moreover, we compared them with those of old porcelain wares in Houhoku-town.
2. Experimental procedure
Ig. Loss of six raw materials (A, B, C, D, E and F) was measured by taking difference of weight between before and after burning at 1000K. Samples for X-ray fluorescence (XRF) spectroscopy analysis were prepared in 1 : 10 glass beads to analyze the chemical composition of 9 major elements (Si, Al, Fe, Ti, Ca, Mg, Na, K and P). After XRF analysis, the mineral composition was calculated by CIPW norm which assumes clay as Al2Si2O5(OH)4, silica as SiO2, feldspar as Na2Al2Si6O16 and K2Al2Si6O16, and iron oxide as Fe2O3.
3. Results and Discussion
Figure 1 shows the calculated mineral composition of six raw materials. As shown in figure 1, only material D is rich in feldspar with the content rate of 30 wt%. Since 24~27 wt% feldspar is contained in collected old porcelain wares at Nakabara- and Sakaige-kilns, material D would be possibly used as feldspar. On the other hand, collected porcelain wares in Iinoyama- and Hara-kilns contain 31~37 wt% feldspar. In this case, there is no corresponding material containing more than 30 wt% feldspar. Therefore, these porcelain wares would be produced by using other materials that contains much feldspar.
References:
[1] Implementation Report of Iconotheque Project, p37-49 (1997)
[2] Taisho-kan, UTSUWA, p8-15 (2012) |
Acknowledgements : This work partly supported by the Creation and New Business-Supported for the Yamaguchi¡¡Industrial Promotion Foundation, 2011.
Special thanks to Satoshi Kawata (Doigahama site anthropological museum) and Asami Sasada (Houhoku historical folk material museum) for providing six raw materials. |
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