조선시대 상평통보의 성분 조성과 미세조직을 통한 재료학적 특성 연구
Study on the Materials Characteristics of Sangpyeongtongbo Coins in Joseon Dynasty Using Chemical Compositions and Microstructures
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초록
주전소와 주전 시기가 다른 상평통보 25점을 확보하여 성분 조성 및 주전 방법을 알아보았다. 상평통보의 성분분석 결과, 주성분은 Cu, Zn, Pb이며 일부 시료에서는 Sn, Fe가 함유되어 있다. 그러나 각 상평통보의 성분 조성은 일정하지 않으며 편차가 크다. 또한, 주전 시기에 따라 Cu와 Sn은 후대로 갈수록 감소하였고, Zn과 Pb는 전시기에 걸쳐 꾸준히높게 함유되어 있다. 이러한 성분 함량의 차이는 당시 주전 이익과 관련이 깊은 것으로 판단된다. 미세조직 관찰 결과, 상평통보 25점은 수지상 조직, 입상조직, 미립화 조직 등 다양한 조직 형태가 확인된다. 그러나 열처리나 가공의 흔적이관찰되지 않아 모두 주조 조직으로 판단되며, 일부 상평통보에 함유된 Sn, Fe 성분과 냉각 속도 차이에 의해 서로 다른형태의 조직이 성장한 것으로 확인된다
Abstract
This study attempted to review the chemical composition of 25 samples of Sangpyeongtongbo having different manufacturing place and period, and then to find the manufacturing method. As a result of chemical composition analysis of Sangpyeongtongbo, main components include Cu, Zn and Pb, and some samples contained Sn and Fe. But, the chemical composition of each Sangpyeongtongbo varied with big differences. When the main content change was examined, Cu and Sn became decreased at the later period, and Zn and Pb had higher contents. The difference in the ingredient content had close relation for the profit of Sangpyeongtongbo. When refined microstructure was observed, 25 kinds of Sangpyeongtongbo had developed different types of microstructure such as dendrite, large grain and grain refinement. But, 25 kinds of Sangpyeongtongbo had no heat treatment processing. And, the types of microstructure were difference, which seems because different microstructure was developed due to the difference of Sn and Fe and cooling speed in Sangpyeongtongbo
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