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J. Conserv. Sci > Volume 32(4); 2016 > Article
Journal of Conservation Science 2016;32(4):549-560.
DOI: https://doi.org/10.12654/JCS.2016.32.4.09    Published online December 31, 2016.
진안 봉곡도요지 출토 흑유자기의 재료학적 특성 분석
박민수, 정광용
Analysis of Material Characteristics for Blackwares at Excavated from the Bonggok Kiln Site of Jinan-gun
Minsoo Park, Kwang Yong Chung
초 록
진안 봉곡도요지 출토 흑유자기에 대하여 과학적 분석과 재현실험으로 재료학적 특성 자료를 제시하고자 한다. 미시적 관찰과 물리적 특성, 화학조성 분석으로 구분하여 실시하였으며, 재현실험은 분석결과에 따라 시판 흑유, 석간주 및 석회석을 사용하여 시편을 제작하고 단면을 관찰하였다. 물리적 특성은 자화 정도에 따라 일부 도편에서 차이를 보이며, 미시적 관찰에서 유약 내에 수지상 등의 결정 조직이 관찰되었다. 열분석에서 1200℃ 내외에서 발열피크가 확인되고 결정구조분석에서 뮬라이트가 동정되어, 약 1100~1200℃의 온도에서 소성된 것으로 판단할 수 있다. 유약의 성분 조성은 타 지역 출토 흑유자기의 유약에 비하여 Fe2O3의 함량이 약 22%로 높게 나타나며, CaO의 함량은 약 9%로 낮게 나타난다. 재현실험에서 석간주와 석회석의 혼합비에 따라 유약층의 단면에서 출토 도편과 유사한 결정 조직을 이루는 것이 관찰되었다. 이는 산화철이 용융, 응고되는 과정에서 생성되는 것으로 추정된다.
중심어: 봉곡도요지, 흑유자기, 유약, 석간주, 산화철
ABSTRACT
The purpose of this study is to identify the material characteristics of blackwares excavated from the Bonggok kiln site in Jinan-gun, Jeollabuk-do Province, South Korea, by scientific analyses and a reproduction experiment. Scientific analyses were conducted to determine the physical properties, chemical composition and for microscopic observation of blackwares. A reproduction experiment was also conducted by producing ceramic samples with black glaze, red ocher and limestone, and then cross sections of the samples were observed. The analysis results showed that all the excavated blackwares have similar properties such as chromaticity, specific gravity, absorption factor and porosity, but there is a difference depending on the crystallization of the ceramics. Thermal analysis showed that the exothermic peak was observed at about 1200℃, and crystal structure analysis indicated the presence of mullite. Hence, it can be concluded that the firing temperature of the excavated blackwares was around 1100-1200℃. Moreover, the glaze present on these blackwares has about 22% higher Fe2O3 content than those excavated from other places; however, the former has lower CaO content. For the reproduction experiment, samples were made using limestone as a flux and red ocheras a glaze. The results show that the cross section of the glaze layer of the reproduced sample have iron crystals with dendritic structures, similar to those present in the excavated black-wares. It is assumed that such iron crystals were formed during the process of melting and solidification of the iron oxide present in the blackwares.
Key Words: Bonggok kiln site, Blackware, Glaze, Red ocher, Iron oxide


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