A Study on Characteristics of Alloy Materials through Reproduction Experiment of High-tin Bronze Mirror with Geometric Designs

This study analyzed on alloys and by-product samples produced through the reproduction experiment of bronze mirror with geometric designs. The alloy ratio used in the first and second reproduction experiments was based on the analysis results of bronze mirror with geometric designs(Cu 61.68%, Sn 32.25%, Pb 5.46%) which is the national treasure No. 141. As a result of portable X-ray fluorescence analysis on the raw materials used in the reproduction experiment, the contents of copper raw materials were 98.85 wt% for Cu, tin raw materials were 99.03 wt% for Sn, and lead raw materials were 70.19 wt% for Pb, and 21.81 wt% for Sn. Sn and Pb were added 5 wt% more considering the evaporation amount of tin and lead during alloy melting. The result produced by the first reproduction experiment were 58.75 wt% for Cu, 36.87 wt% for Sn, 4.39 wt% for Pb, and the other result produced by the second reproduction experiment were 58.66 wt% for Cu, 35.89 wt% for Sn, and 5.50 wt% for Pb. The composition of the components was about 3.00 wt% in Cu and Sn respectively, and the microstructure was similar to the previous studies because the δ phase was observed mainly. The results of this study will be used as basic data for the materialistic characteristics of ancient bronze mirror in the future.

고주석 청동정문경(靑銅精文鏡)의 재현실험을 통한 합금재료의 특성 연구

본 연구는 청동 정문경 제작공정 재현과정에서 생산된 합금 및 부산물을 대상으로 자연과학적 분석을 실시하였다. 재현실험의 합금비율은 국보 제141호 정문경에 대한 분석결과(Cu 61.7%, Sn 32.3%, Pb 5.5%)를 바탕으로 하였다. 사용된 원료에 대한 X-선 형광분석 결과, 구리는 Cu 98.9 wt%, 주석은 Sn 99.0 wt%, 납은 Pb 70.2 wt%, Sn 21.8 wt%로 확인되었다. 합금 용융 시주석과 납의 기화량을 감안하여 Sn, Pb은 5 wt%씩 더 첨가하였다. 1차 재현실험 결과는 Cu 58.8 wt%, Sn 36.9 wt%, Pb 4.4 wt%, 2차 재현실험 결과는 Cu 58.7 wt%, Sn 35.9 wt%, Pb 5.5 wt%로 확인되었다. 성분조성은 Cu와 Sn에서 약 3 wt%씩 차이를 보였으며, 미세조직은 주로 δ상이 관찰되어 선행연구와 유사한 양상을 나타내었다. 본 연구를 통해 향후 고대 청동거울의 재료학적 특성 규명에 있어 기초자료로 활용되었으면 한다.