Study of container using hybrid technique for sulfuric acid decomposition of thermochemical water-splitting iodine-sulfur process

Ioka, Ikuo; Iwatsuki, Jin; Kuriki, Yoshiro*; Kawai, Daisuke*; Yokota, Hiroki*; Kubo, Shinji; Inagaki, Yoshiyuki; Sakaba, Nariaki

Mechanical Engineering Journal (Internet), 7(3), p.19-00377_1 - 19-00377_11, 2020/06

https://doi.org/10.1299/mej.19-00377

A thermochemical water-splitting iodine-sulfur processes (IS process) is one of candidates for the large-scale production of hydrogen with high cost performance. Severe corrosive environment which is thermal decomposition of sulfuric acid exists in the IS process. A hybrid material with the corrosion-resistance and the ductility was made by a plasma spraying and laser treatment. The specimen had excellent corrosion resistance in the condition of 95 mass% boiling sulfuric acid. This was attributed to the formation of SiO on the surface. To confirm the production characteristics of a container using the hybrid material, the container which has a welded part, a chamfer, a curved surface was experimentally made. There was no detachment in the plasma spraying and laser treated layer of the container after the laser treatment. It was confirmed that the construction of the container with high corrosion resistance in sulfuric acid was possible in the hybrid technique.

Out-of-pile characterization of AlO coating as electrical insulator

Nakamichi, Masaru; Kawamura, Hiroshi

Fusion Engineering and Design, 58-59, p.719 - 723, 2001/11

https://doi.org/10.1016/S0920-3796(01)00543-9

no abstracts in English

Trial fabrication and preliminary characterization of electrical insulator for liquid metal system

Nakamichi, Masaru; Kawamura, Hiroshi; Oyamada, Rokuro

JAERI-Tech 95-009, 44 Pages, 1995/03

JAERI-Tech-95-009.pdf:2.89MB

no abstracts in English

Development of hybrid material using plasma spraying and laser treatment for thermochemical water-splitting iodine-sulfur process

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

no journal, , 

IS process is composed of the Bunsen reaction, thermal decomposition of hydrogen iodide and thermal decomposition of sulfuric acid. By carrying out three reactions sequentially, water can be decomposed into hydrogen and oxygen. Evaluation of materials for the sulfuric acid decomposition has revealed that high silicon alloys have excellent corrosion resistance. The material is brittle, so it's difficult to use them independently as structural materials. So, we have developed a hybrid material with the corrosion-resistant and the ductility. In this work, the hybrid material was made by the plasma spraying and laser treatment. Corrosion tests on the hybrid material were carried out. The evaluation that paid attention to cracks of the surface layer was performed using OM and SEM/EDX. The surface of the hybrid material showed corrosion resistance in boiling 47% sulfuric acid though some cracks were observed in the surface layer from the cross section observation.