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A Thermal and Acid Treatment for Carbon Extraction from Cast Iron and Its Application to Ams Dating of Cast Iron Objects from Ancient Korea

Published online by Cambridge University Press:  18 July 2016

J S Park ,
G S Burr  and
A J T Jull
J S Park*
Affiliation:
Department of Metallurgical Engineering, Hongik University, Chochiwon Choongnam, 339-701, Korea
G S Burr
Affiliation:
NSF-Arizona AMS Laboratory, University of Arizona, Physics Department, 1118 E. 4th St., Tucson, Arizona 85721, USA
A J T Jull
Affiliation:
NSF-Arizona AMS Laboratory, University of Arizona, Physics Department, 1118 E. 4th St., Tucson, Arizona 85721, USA
*
Corresponding author. Email: jskpark@hongik.ac.kr
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Abstract

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A method of thermal and acid treatments was developed at the Archaeo-metallurgy Laboratory of Hongik University in Korea to extract carbon from cast iron, and carbon objects thus prepared from cast iron artifacts of ancient Korea were dated at the University of Arizona's AMS Facility. The thermal treatments consist of heating a specimen to ∼1000 °C in a controlled environment with reduced oxygen potential, then cooling it rapidly to room temperature. The heating causes the cementite phase in white cast iron to be graphitized and the quenching suppresses pearlite formation. The specimen then consists of flakes of graphite embedded in a matrix of martensite. The next stage of the treatment is to dissolve the martensite matrix in a solution of nitric and hydrochloric acids to release the graphite as a powder. This material is then cleaned, dried, and pressed into target holders for accelerator mass spectrometry (AMS) analysis. The method was applied to a collection of artifacts from the Korean Three Kingdoms period (about AD 300–668) and the AMS results were compared with chronological estimates from other means.

Type
Sample Preparation
Information
Radiocarbon , Volume 52 , Issue 3: 20th Int. Radiocarbon Conference Proceedings , 2010 , pp. 1312 - 1321
Copyright
Copyright © 2010 by the Arizona Board of Regents on behalf of the University of Arizona 

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