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Self-ignition combustion synthesis of TiFe in hydrogen atmosphere

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Title: Self-ignition combustion synthesis of TiFe in hydrogen atmosphere
Authors: Wakabayashi, R. Browse this author
Sasaki, S. Browse this author
Saita, I. Browse this author
Sato, M. Browse this author
Uesugi, H. Browse this author
Akiyama, T. Browse this author →KAKEN DB
Keywords: Hydrogen storage materials
Powder metallurgy
Gas-solid reactions
Metal hydrides
Issue Date: 8-Jul-2009
Publisher: Elsevier B.V.
Journal Title: Journal of Alloys and Compounds
Volume: 480
Issue: 2
Start Page: 592
End Page: 595
Publisher DOI: 10.1016/j.jallcom.2009.02.008
Abstract: This paper describes the self-ignition combustion synthesis (SICS) of highly active titanium iron (TiFe) in a high-pressure hydrogen atmosphere without employing an activation process. In the experiments, well-mixed powders of Ti and Fe in the molar ratio of 1:1 are uniformly heated up to 1085℃, the eutectic temperature of Ti-Fe binary system, in pressurized hydrogen at 1.0 MPa. The electric source is disconnected immediately after the ignition between Ti and Fe, and the mixture is cooled naturally. In the experiments, the exothermic reaction Ti + Fe → TiFe + 40 kJ occurrs at 1085℃ after the hydrogenation and decomposition of Ti. X-ray diffraction analysis showes that the final product had only one phase -- TiFeH_[0.06] -- which contains 1.55 mass% of hydrogen at 4.0 MPa of hydrogen pressure. The product obtained by SICS contains considerably more hydrogen quickly as compared to the commercially available product; this fact can be explained by the porous structure of the obtained product, which is observed using a scanning electron microscope. In conclusion, the SICS of TiFe saves time and energy, yields products with high porosity and small crystals, enabled easy hydrogenation, and did not require activation processes.
Type: article (author version)
Appears in Collections:エネルギー・マテリアル融合領域研究センター (Center for Advanced Research of Energy and Material) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 秋山 友宏

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