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873KにおけるZr-35Cu合金の高温酸化

High temperature oxidation of Zr-35Cu alloy at 873 K

仲原 魁人*; 川田 理央*; 入澤 恵理子 ; 上田 光敏*; 河村 憲一*

Nakahara, Kaito*; Kawada, Rio*; Irisawa, Eriko; Ueda, Mitsutoshi*; Kawamura, Kenichi*

Zr酸化皮膜を利用した酸素センサーの開発において、Zr酸化皮膜成長に伴う酸素吸収により、正確な酸素濃度測定ができないことが問題となる。この課題を解決するために、Zrの活量を下げ酸化皮膜成長を抑制する合金元素としてZr-Cu合金系に着目した。本研究ではZr-35Cu(Zr$$_{2}$$CuとZr$$_{7}$$Cu$$_{10}$$の2相共存合金)における高温酸化挙動を検討した。その結果、今回検討したZr-Cu合金ではZrO$$_{2}$$の成長抑制はできないことが明らかとなった。

In order to develop oxygen sensor using oxide scales formed on the surface of zirconium alloy, we focused on zirconium and copper alloy system. It was expected that the oxide scale of Zr oxide on the alloy is thin and elaborate compared with that on the pure Zr because the activity of Zr in the alloy is reduced and the oxidation rate of alloy become slow. Therefore the oxidation behavior and mechanism of two phase alloy, Zr-35Cu which is composed of Zr$$_{2}$$Cu and Zr$$_{7}$$Cu$$_{10}$$, was studied. The results showed the oxidation rate of the alloy was same with that of the pure Zr.

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