Steam Oxidation of Zirconium–Yttrium Alloys from 500– 1100 C

Peter Mouche, Brent Heuser

Research output: Contribution to journalArticlepeer-review

Abstract

The steam oxidation kinetics, oxide formation, and hydrogen uptake of nuclear-grade Zr with 0.01–12 wt% yttrium were studied. Metallography and diffraction of the as-received material showed yttrium remained trapped in solid solution in concentrations up to 2 wt%; therefore, steam oxidation focused on 0.01–1 wt% Y samples. Thermogravimetric analysis was performed in a steam–argon environment at 500∘C,700∘C,900∘C, and 1100∘C at atmospheric pressure. At 500∘C and 700∘C, increasing the yttrium concentration increased the total weight gain by up to 300% and caused an increase the oxidation power-law exponent. At 900∘C, increasing the yttrium concentration caused a much smaller increase in the weight gain, and resulted in a decrease in the oxidation power-law exponent. At the highest temperature, 1100∘C, increasing the yttrium concentration had a minimal effect on the kinetics. Transmission synchrotron diffraction and cross-sectional optical microscopy showed significant hydrogen uptake at 500∘C and 700∘C through the formation of δ and γ zirconium hydrides. The volume of these two hydride phases increased with increasing yttrium concentration. This hydrogen uptake appears to be linked to the increase in the steam oxidation power-law exponent observed at 500∘C and 700∘C.

Original languageEnglish (US)
Pages (from-to)259-277
Number of pages19
JournalOxidation of Metals
Volume91
Issue number3-4
DOIs
StatePublished - Apr 1 2019

Keywords

  • Hydride
  • Steam oxidation
  • Yttrium
  • Zirconium

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Metals and Alloys
  • Materials Chemistry

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