Oxidation properties of Zr-Nb alloys at 973-1273 K in air

Research output: Contribution to journalArticle

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Abstract

In order to investigate the oxidation behavior of LWR cladding materials under the condition of reactor accidents, e.g. LOCA, Zr-Nb alloys with 1-10 wt%Nb and Zircaloy-4 (0 wt%Nb) were oxidized at 973-1273 K in dry air. The weight gain due to oxidation increased with Nb content at 973 and 1073 K was the smallest for 2.5 wt%Nb at 1173 and 1273 K. The oxidation kinetics obeyed the parabolic rate law without a few cases, e.g. 6-10 wt%Nb and 1273 K. The parabolic rate constant at high temperatures had the somewhat low activation energy compared to that at low temperatures. These results implied that such oxidation behaviors of Zr-Nb alloys related to the lattice structures of oxide films as well as underlying metal during oxidation. Especially at high temperatures, 6ZrO2-Nb2O5 compound might promote the oxidation of Zr-Nb alloys with high content of Nb.

Original languageEnglish
Pages (from-to)307-312
Number of pages6
JournalProgress in Nuclear Energy
Volume51
Issue number2
DOIs
Publication statusPublished - Mar 1 2009

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oxidation
Oxidation
air
Air
Loss of coolant accidents
activation energy
Temperature
Oxide films
accident
Rate constants
Accidents
Activation energy
oxide
kinetics
Kinetics
metal
Metals
rate

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Safety, Risk, Reliability and Quality
  • Energy Engineering and Power Technology
  • Waste Management and Disposal

Cite this

Oxidation properties of Zr-Nb alloys at 973-1273 K in air. / Arima, Tatsumi; Miyata, Kensaku; Idemitsu, Kazuya; Inagaki, Yaohiro.

In: Progress in Nuclear Energy, Vol. 51, No. 2, 01.03.2009, p. 307-312.

Research output: Contribution to journalArticle

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abstract = "In order to investigate the oxidation behavior of LWR cladding materials under the condition of reactor accidents, e.g. LOCA, Zr-Nb alloys with 1-10 wt{\%}Nb and Zircaloy-4 (0 wt{\%}Nb) were oxidized at 973-1273 K in dry air. The weight gain due to oxidation increased with Nb content at 973 and 1073 K was the smallest for 2.5 wt{\%}Nb at 1173 and 1273 K. The oxidation kinetics obeyed the parabolic rate law without a few cases, e.g. 6-10 wt{\%}Nb and 1273 K. The parabolic rate constant at high temperatures had the somewhat low activation energy compared to that at low temperatures. These results implied that such oxidation behaviors of Zr-Nb alloys related to the lattice structures of oxide films as well as underlying metal during oxidation. Especially at high temperatures, 6ZrO2-Nb2O5 compound might promote the oxidation of Zr-Nb alloys with high content of Nb.",
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AU - Arima, Tatsumi

AU - Miyata, Kensaku

AU - Idemitsu, Kazuya

AU - Inagaki, Yaohiro

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N2 - In order to investigate the oxidation behavior of LWR cladding materials under the condition of reactor accidents, e.g. LOCA, Zr-Nb alloys with 1-10 wt%Nb and Zircaloy-4 (0 wt%Nb) were oxidized at 973-1273 K in dry air. The weight gain due to oxidation increased with Nb content at 973 and 1073 K was the smallest for 2.5 wt%Nb at 1173 and 1273 K. The oxidation kinetics obeyed the parabolic rate law without a few cases, e.g. 6-10 wt%Nb and 1273 K. The parabolic rate constant at high temperatures had the somewhat low activation energy compared to that at low temperatures. These results implied that such oxidation behaviors of Zr-Nb alloys related to the lattice structures of oxide films as well as underlying metal during oxidation. Especially at high temperatures, 6ZrO2-Nb2O5 compound might promote the oxidation of Zr-Nb alloys with high content of Nb.

AB - In order to investigate the oxidation behavior of LWR cladding materials under the condition of reactor accidents, e.g. LOCA, Zr-Nb alloys with 1-10 wt%Nb and Zircaloy-4 (0 wt%Nb) were oxidized at 973-1273 K in dry air. The weight gain due to oxidation increased with Nb content at 973 and 1073 K was the smallest for 2.5 wt%Nb at 1173 and 1273 K. The oxidation kinetics obeyed the parabolic rate law without a few cases, e.g. 6-10 wt%Nb and 1273 K. The parabolic rate constant at high temperatures had the somewhat low activation energy compared to that at low temperatures. These results implied that such oxidation behaviors of Zr-Nb alloys related to the lattice structures of oxide films as well as underlying metal during oxidation. Especially at high temperatures, 6ZrO2-Nb2O5 compound might promote the oxidation of Zr-Nb alloys with high content of Nb.

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