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Development research of corrosion-resistant structural material using Fe-Si alloy lining centrifugal cast-iron for thermochemical water-splitting iodine-sulfur process

熱分解水素製造法ISプロセス用の遠心鋳造Fe-高Si合金ライニング耐食構造材の研究開発

井岡 郁夫; 栗木 良郎*; 岩月 仁; 久保 真治; 稲垣 嘉之

Ioka, Ikuo; Kuriki, Yoshiro*; Iwatsuki, Jin; Kubo, Shinji; Inagaki, Yoshiyuki

原子力機構では、高温ガス炉の利用系として水素を製造する熱化学水素製造法(ISプロセス)の研究開発を進めている。ISプロセスには、濃硫酸を沸騰させて分解する過酷な腐食環境が含まれている。この腐食環境で十分な耐食性を有する材料としては、Fe-高Si合金とSiCの2種類の脆性材料が報告されている。延性のある炭素鋼の内側に耐沸騰硫酸用のFe-高Si合金を遠心鋳造によりライニングした2層管を作製し、その特性評価を実施した。Fe-高Si合金ライニング部は、沸騰硫酸中でも十分な耐食性を示した。Fe/Fe-高Si合金界面の評価として、熱サイクル試験(100$$^{circ}$$C-900$$^{circ}$$C)を実施し、界面はく離はなく、十分な界面強度を有することを確認した。

The thermochemical water-splitting (IS process) for hydrogen production has been developed by JAEA as application of a high-temperature gas cooled reactor. The IS process includes a severe corrosion environment which is made to boil and decompose concentrated sulfuric acid. Two kinds of brittleness materials, SiC and Fe-high Si alloy, are reported as materials having enough corrosion resistance in this corrosion environment. The two-layer pipe consisted of the Fe-high Si alloy with boiling sulfuric acid-resistant and the carbon steel with the ductility was produced by centrifugal casting. The evaluation of characteristics was carried out. The Fe-high Si alloy lining showed enough corrosion resistance in boiling sulfuric acid. As evaluation of the Fe / Fe-high Si alloy interface, thermal cycle test (100$$^{circ}$$C-900$$^{circ}$$C) was executed. There was not the interface detachment and it was confirmed to have enough interfacial strength.

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