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High temperature oxidation of FBR structural materials in carbon dioxide and in air

二酸化炭素中及び空気中における高速炉構造材料の高温酸化挙動

古川 智弘; 加藤 章一; 稲垣 嘉之; 有冨 正憲*

Furukawa, Tomohiro; Kato, Shoichi; Inagaki, Yoshiyuki; Aritomi, Masanori*

高速炉への超臨界CO$$_{2}$$ガスタービンサイクルへの適用に向けた課題の一つに、高温超臨界CO$$_{2}$$中での構造材料の腐食が挙げられる。本研究では、0.2MPa及び1MPaに加圧したCO$$_{2}$$中及び大気中において構造材料の高温酸化試験を実施し、その酸化挙動を調べた。これまでに報告している10MPa及び20MPaの超臨界CO$$_{2}$$中での高温酸化挙動を含めて評価した結果、すべての供圧材においてCO$$_{2}$$圧力の影響はほとんど見られなかった。また、大気中における高温酸化は、CO$$_{2}$$中での結果に比べて非常に小さかった。

A key problem in the application of a supercritical carbon dioxide (CO$$_{2}$$) turbine cycle to a fast breeder reactor is the corrosion of structural materials brought about by supercritical CO$$_{2}$$ at high temperatures. In this study, high-temperature oxidation tests on the structural materials were performed in carbon dioxide pressurized at 0.2 and 1 MPa, and in air, and the oxidation behavior were compared. Results of investigating the effect of CO$$_{2}$$ pressure including the previous reports tested at 10 MPa and at 20 MPa, the effect was hardly observed for all steels. In air environment, weight gain caused by high temperature oxidation was much lower than that in CO$$_{2}$$.

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