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http://dx.doi.org/10.12654/JCS.2016.32.3.02

A Study of the Microstructure and Impurity Characteristics of Cast Bronze in Koryo Period  

Choi, Jung Eun (Preservation and Conservation Division, Presidential Archives)
Publication Information
Journal of Conservation Science / v.32, no.3, 2016 , pp. 313-320 More about this Journal
Abstract
The aim of this study was to obtain information on the ancient material of cast bronze through an investigation of the microstructure and impurity characteristics of the casting. Three Koryo bronze coins were analyzed using an optical microscope, scanning electron microscope, and electron dispersive X-ray analyses were used to determine the composition of the specimens. The three coins had 4 phases: ${\alpha}phase$, ${\delta}phase$, Pb, and impurities ($Cu_2S$). $Cu_2S$ was found to exist near Pb or in ${\delta}phase$. $Cu_2S$ is the inter mediate product of copper ore refining. Therefore, the copper ore was not completely refined. To find out the characteristic of $Cu_2S$, we melt 1)Koryo bronze coin and 2)$Cu_2S$ and Pb powder at 1273 K. The reaction between $Cu_2S$ and Pb at 1273 K yielded fine Cu and black gas, which was identified to be PbS and is presented below: $Cu_2S+Pb{\rightarrow}PbS{\uparrow}+2Cu$.
Keywords
$Cu_2S$; Pb; PbS; Impurity; Bronze casting;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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