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Self-ignition combustion synthesis of TiFe in hydrogen atmosphere
| 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) |
| URI: | http://hdl.handle.net/2115/38862 |
| 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)
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Submitter: 秋山 友宏
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