高麗青銅製浄瓶（じょうへい）の金属組織

抄録

  Koryo bronze bottles were first produced in India, and then were introduced to Korea through China. In the Koryo period, bronze bottles were used not only in Buddhist ceremonies, but also in the daily life of the upper class. The composition of the body of the Koryo bronze bottle analyzed is Cu-15.5 mass%Pb-9.4 mass%Sn-0.7 mass%S. The bottom metal fitted into the bottle body is Cu. Sulfur, which is detected in the bottle body, is not detected in the bottom metal. Therefore, the body and bottom metal were made separately. Since the traces of polishing were found on the body surface, it is thought that the body of the bottle was finished to give a smooth surface. The microstructure of the bronze body consists of αCu, α+δ phase, Pb, and Cu₂S. On the other hand, recrystallized Cu was used for the bottom metal. A hole that had been formed when the body was cast has been filled with Cu-Sn-Pb soldering alloy. The copper particles in the Pb phase were produced by the reaction between Cu₂S and Pb when the hole was filled with soldering alloy.