Post-breakaway Oxidation of Zirconium and its Alloys

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  • ジルコニウムおよびその合金の後期酸化
  • ジルコニウム オヨビ ソノ ゴウキン ノ コウキ サンカ

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Abstract

The post-breakaway oxidation rate of reactor grade pure zirconium, 2.5% tin-zirconium and 0.24% iron-zirconium alloy in dry oxygen and air were measured over the temperature range of 500∼850°C and pressure range of 15∼760 mmHg. The results were as follows: (1) A lower oxidation rate and its pressure dependence were found in the oxidation of pure zirconium and 0.24% iron-zirconium alloy in oxygen. (2) A higher oxidation rate and its pressure dependence were found in the oxidation of 2.5% tin-zirconium alloy in oxygen and air. (3) In the case of air oxidation of pure zirconium and 0.24% iron-zirconium alloy the oxidation rate and its pressure dependence increased remarkably with temperature. (4) Thus, a correspondence between oxidation rate and its pressure dependence were found.

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