The Effect of Tellurium on Oxidation Resistance of Zirconium Alloys

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  • Zr合金の耐酸化性に及ぼすTeの影響
  • Zr ゴウキン ノ タイサンカセイ ニ オヨボス Te ノ エイキョウ

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Abstract

This study was conducted to develope a new oxidation-resistant zirconium alloy. As the oxidation proceeds by anion migration via vacancies through the oxide film, some factors contributing to the concentration and the mobility of vacancies were examined, such as the valency of the alloying ion, ionic radius, ionization potential, etc. As a result of the examination, sulfur selenium and tellurium were expected to have a beneficial effect on the oxidation resistance of zirconium. The oxidation test of some zirconium-tellurium alloys in oxygen or air was carried out with a silica spring thermobalance. The test showed that the breakaway time for oxidation was much delayed by adding some amount of tellurium to zirconium and thus proved the beneficial action of tellurium for enhancing oxidation resistance. For example, the breakaway times of pure zirconium, 0.2%Te-Zr and 0.059%Te-Zr alloys for oxidation in air at 750° were respectively 1300 min, 2000 min, and 3600 min, while with 0.016%Te-Zr specimen no breakaway was observed to occur before 5500 min.

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