Characteristics of hybrid tube with Fe-high Si alloy lining by centrifugal casting for thermochemical water-splitting iodine-sulfur process

An iodine-sulfur process based 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...

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Autores principales:	Ikuo IOKA, Yoshiro KURIKI, Jin IWATSUKI, Shinji KUBO, Jinya KATSUYAMA, Yoshiyuki INAGAKI
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2016
Materias:	fe-high si alloy centrifugal casting boiling sulfuric acid corrosion resistance thermochemical water-splitting process iodine-sulfur system fem Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/dc466d523eb943b5a65f7f6cdf6fd61b
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spelling	oai:doaj.org-article:dc466d523eb943b5a65f7f6cdf6fd61b2021-11-26T06:51:30ZCharacteristics of hybrid tube with Fe-high Si alloy lining by centrifugal casting for thermochemical water-splitting iodine-sulfur process2187-974510.1299/mej.15-00619https://doaj.org/article/dc466d523eb943b5a65f7f6cdf6fd61b2016-02-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/3/3/3_15-00619/_pdf/-char/enhttps://doaj.org/toc/2187-9745An iodine-sulfur process based 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 brittle materials, SiC, Si3N4 and Fe-high Si alloy, were reported as materials having enough corrosion resistance in this corrosion environment. The hybrid tube consisting of the Fe-high Si alloy with boiling sulfuric acid-resistant and the carbon steel with the ductility was produced by a centrifugal casting. An evaluation of the characteristics was carried out by hardness measurements, corrosion tests and thermal cyclic tests. The configuration of the hybrid tube by the centrifugal casting was 240 mm in outer diameter, 200 mm in inner diameter and 980 mm in length. The inner layer of the Fe-high Si alloy and the outer layer of the carbon steel stuck at the interface without pores. There is no intermetallic compound at the interface between the carbon steel and the Fe-high Si. The Fe-high Si alloy lining showed enough corrosion resistance in boiling concentrated sulfuric acid. Thermal cyclic tests (100-900 °C) were executed in order to evaluate the interface between the carbon steel and the Fe-high Si alloy. There was no detachment of the interface though the groove and the cracks were generated in the vicinity of the interface by thermal cycling. It is believed that the cracks parallel to the interface is attributed to the tensile stress during the heating process of thermal cyclic test and the flake graphite precipitate on the grain boundary. It was confirmed that the interface possessed the enough strength.Ikuo IOKAYoshiro KURIKIJin IWATSUKIShinji KUBOJinya KATSUYAMAYoshiyuki INAGAKIThe Japan Society of Mechanical Engineersarticlefe-high si alloycentrifugal castingboiling sulfuric acidcorrosion resistancethermochemical water-splitting processiodine-sulfur systemfemMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 3, Iss 3, Pp 15-00619-15-00619 (2016)
institution	DOAJ
collection	DOAJ
language	EN
topic	fe-high si alloy centrifugal casting boiling sulfuric acid corrosion resistance thermochemical water-splitting process iodine-sulfur system fem Mechanical engineering and machinery TJ1-1570
spellingShingle	fe-high si alloy centrifugal casting boiling sulfuric acid corrosion resistance thermochemical water-splitting process iodine-sulfur system fem Mechanical engineering and machinery TJ1-1570 Ikuo IOKA Yoshiro KURIKI Jin IWATSUKI Shinji KUBO Jinya KATSUYAMA Yoshiyuki INAGAKI Characteristics of hybrid tube with Fe-high Si alloy lining by centrifugal casting for thermochemical water-splitting iodine-sulfur process
description	An iodine-sulfur process based 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 brittle materials, SiC, Si3N4 and Fe-high Si alloy, were reported as materials having enough corrosion resistance in this corrosion environment. The hybrid tube consisting of the Fe-high Si alloy with boiling sulfuric acid-resistant and the carbon steel with the ductility was produced by a centrifugal casting. An evaluation of the characteristics was carried out by hardness measurements, corrosion tests and thermal cyclic tests. The configuration of the hybrid tube by the centrifugal casting was 240 mm in outer diameter, 200 mm in inner diameter and 980 mm in length. The inner layer of the Fe-high Si alloy and the outer layer of the carbon steel stuck at the interface without pores. There is no intermetallic compound at the interface between the carbon steel and the Fe-high Si. The Fe-high Si alloy lining showed enough corrosion resistance in boiling concentrated sulfuric acid. Thermal cyclic tests (100-900 °C) were executed in order to evaluate the interface between the carbon steel and the Fe-high Si alloy. There was no detachment of the interface though the groove and the cracks were generated in the vicinity of the interface by thermal cycling. It is believed that the cracks parallel to the interface is attributed to the tensile stress during the heating process of thermal cyclic test and the flake graphite precipitate on the grain boundary. It was confirmed that the interface possessed the enough strength.
format	article
author	Ikuo IOKA Yoshiro KURIKI Jin IWATSUKI Shinji KUBO Jinya KATSUYAMA Yoshiyuki INAGAKI
author_facet	Ikuo IOKA Yoshiro KURIKI Jin IWATSUKI Shinji KUBO Jinya KATSUYAMA Yoshiyuki INAGAKI
author_sort	Ikuo IOKA
title	Characteristics of hybrid tube with Fe-high Si alloy lining by centrifugal casting for thermochemical water-splitting iodine-sulfur process
title_short	Characteristics of hybrid tube with Fe-high Si alloy lining by centrifugal casting for thermochemical water-splitting iodine-sulfur process
title_full	Characteristics of hybrid tube with Fe-high Si alloy lining by centrifugal casting for thermochemical water-splitting iodine-sulfur process
title_fullStr	Characteristics of hybrid tube with Fe-high Si alloy lining by centrifugal casting for thermochemical water-splitting iodine-sulfur process
title_full_unstemmed	Characteristics of hybrid tube with Fe-high Si alloy lining by centrifugal casting for thermochemical water-splitting iodine-sulfur process
title_sort	characteristics of hybrid tube with fe-high si alloy lining by centrifugal casting for thermochemical water-splitting iodine-sulfur process
publisher	The Japan Society of Mechanical Engineers
publishDate	2016
url	https://doaj.org/article/dc466d523eb943b5a65f7f6cdf6fd61b
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_version_	1718409747593428992

Characteristics of hybrid tube with Fe-high Si alloy lining by centrifugal casting for thermochemical water-splitting iodine-sulfur process

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