Potential source of carbon contamination in U-Zr melt processed in Y2O3-plasma-spray-coated graphite

Seong Jun Ha, Seoung Woo Kuk, Kyung Chai Jeong, Young Kook Lee, Jeong Yong Park

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4 Citations (Scopus)

Abstract

This study investigated carbon contamination in U-10wt.%Zr metallic fuel in the casting process based on the interaction between the U-Zr alloy melt and the Y2O3-plasma-spray-coated graphite. During the injection casting of U-10wt.%Zr, a ZrC reaction layer was found to form at the interface between the U-Zr melt and the Y2O3-plasma-coated graphite crucible. ZrC inclusions were also found in the matrix of the melt residue. This C contamination, evidenced by the formation of ZrC, is attributed to the migration of C through the Y2O3 coating from the graphite crucible. The results of TGA experiments using a Y2O3-plasma-coated graphite sample suggest that CO is produced by a reaction between Y2O3 and graphite at temperatures above 1773 K, which then migrates through defects in the coating to react with Zr in the U-Zr melt.

Original languageEnglish
Article number152810
JournalJournal of Nuclear Materials
Volume547
DOIs
Publication statusPublished - 2021 Apr 15

Bibliographical note

Publisher Copyright:
© 2021 Elsevier B.V.

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • General Materials Science
  • Nuclear Energy and Engineering

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