Investigation of High Temperature Oxidation in Steam for Fe-Cr Alloy Using the Combination of a Hydrogen Sensor and an Oxygen Pump-Sensor

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  • Fukumoto Michihisa
    Materials Science and Engineering Course, Department of Materials Science, Graduate School of Engineering Science, Akita University
  • Akabori Kouta
    Materials Science and Engineering Course, Department of Materials Science, Graduate School of Engineering Science, Akita University
  • Sonobe Hiroshi
    Materials Science and Engineering Course, Department of Materials Science, Graduate School of Engineering Science, Akita University
  • Hara Motoi
    Materials Science and Engineering Course, Department of Materials Science, Graduate School of Engineering Science, Akita University

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Other Title
  • 水素センサーおよび酸素ポンプ・センサーを用いたFe-Cr合金の水蒸気酸化挙動の検討
  • スイソ センサー オヨビ サンソ ポンプ ・ センサー オ モチイタ Fe-Cr ゴウキン ノ スイジョウキ サンカ キョドウ ノ ケントウ

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Abstract

<p>The water vapor oxidation behaviors of Fe and Fe-Cr alloys under isothermal and heat-cyclic conditions in an Ar-12 vol% H2O atmosphere were investigated by measuring both the hydrogen partial pressure using a hydrogen sensor and the oxidizing current of hydrogen using an oxygen pump-sensor, which were installed at the back section of the reactor. First, the performance of the oxygen pump-sensor was evaluated using Ar-1000 ppmH2 gas. As a result, it was found that the hydrogen concentration in the gas can be accurately measured by the oxidizing current of hydrogen. The isothermal oxidation test at 1173 K showed that the mass gain of the Fe-20 mass% Cr alloy was the highest, while the mass gain of the Fe-30 mass% Cr alloy was the lowest. For the Fe-20 mass% Cr alloy showing the highest mass gain, a rapid increase in the oxidation rate was observed during the oxidation test. The cyclic oxidation test indicated that the Fe and Fe-30 mass% Cr alloy had a lower oxidation rate in the second cycle than in the first cycle. On the contrary, for the Fe-20 mass% Cr alloy, the oxidation rate was higher in the second cycle than in the first cycle. For the Fe-30 mass% Cr alloy, the oxidation rate and mass gain during the cyclic oxidation test were low. The oxidation rates measured by the hydrogen sensor and the oxygen pump-sensor were showed the same behavior during the isothermal oxidation test. Since the oxidation rate is measured in situ using the hydrogen sensor and oxygen pump-sensor methods, it was clarified that both methods are effective for studying the water vapor oxidation behavior.</p>

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