Hydriding combustion synthesis of TiFe

Saita, Itoko; Sato, Masahiro; Uesugi, Hiroshi; Akiyama, Tomohiro

doi:10.1016/j.jallcom.2007.02.150

Cited by 38 publications

(20 citation statements)

References 5 publications

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“…HCS has many advantages such as shortening the processing time, purifying the product, boosting energy efficiency, and hydriding an alloy directly. Saita et al [9] reported that HCS Self-ignition Combustion Synthesis of TiFe 1-X Mn X Hydrogen Storage Alloy 4 using excess Ti powder activates TiFe more easily when compared to the conventional melting method. The products exhibited good cycling property; however, this method was not suitable for the mass production of TiFe because the excess Ti was needed as the heat source.…”

Section: Introductionmentioning

confidence: 99%

Self-ignition combustion synthesis of TiFe1−xMnx hydrogen storage alloy

Yasuda

Wakabayashi

Sasaki

et al. 2009

International Journal of Hydrogen Energy

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(147 words)The paper describes the self-ignition combustion synthesis (SICS) of the hydrogen storage alloy TiFe 1-X Mn X (X = 0, 0.1, 0.2, 0.3, and 0.5) in a hydrogen atmosphere, where the hydrogenation properties of the products are mainly examined. In the experiments, the well-mixed powders of Ti, Fe, and Mn in the molar ratio of 1:1-X:X were uniformly heated up to 1473 K, and then were cooled naturally in pressurized hydrogen at 0.9 MPa. All products were successfully synthesized by utilizing the exothermic reaction, which occurred at around 1358 K. The XRD analysis showed that SICS generated TiFe 1-X Mn X in the range of X value from 0 to 0.3. All SICSed products absorbed hydrogen smoothly at 298 K at an initial pressure of 4.1 MPa. Most significantly, TiFe 0.8 Mn 0.2 improved the dual plateau property. The results revealed that SICS was quite effective for producing the hydrogen storage alloy TiFe 1-X Mn X .Self-ignition Combustion Synthesis of TiFe 1-X Mn X Hydrogen Storage Alloy 3

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Section: Introductionmentioning

confidence: 99%

Self-ignition combustion synthesis of TiFe1−xMnx hydrogen storage alloy

Yasuda

Wakabayashi

Sasaki

et al. 2009

International Journal of Hydrogen Energy

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show abstract

“…These techniques effectively eliminate the need for an activation process in the production of hydrogen storage alloys. In particular, a previous study [1] has revealed that the formation of the liquid phase initiates HCS immediately as the temperature of the raw materials reaches the eutectic temperature of the TiFe system. In the experiments, for self-propagating combustion synthesis, two-layered raw materials-Ti powders (heat source) as the upper layer and a mixture of Fe and Ti in the molar ratio of 1:1 as the lower layer-are used since reaction heat of TiFe production is small.…”

Section: Introductionmentioning

confidence: 97%

“…The hydrogen storage alloy titanium iron (TiFe) is practically useful since it has good cycling property, low reaction temperature, low plateau pressure, and low production cost [1]. The conventional product, synthesized by arc melting method, needs a time-and energy-consuming activation process.…”

Section: Introductionmentioning

confidence: 99%

Self-ignition combustion synthesis of TiFe in hydrogen atmosphere

Wakabayashi¹,

Sasaki²,

Saita³

et al. 2009

Journal of Alloys and Compounds

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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°C, the eutectic temperature of Ti-Fe binary system, in a pressurized hydrogen atmosphere 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 occurs at 1085 °C after the hydrogenation and decomposition of Ti. X-ray diffraction analysis shows that the final product has 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 Manuscript for JALCOM 3 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, enables easy hydrogenation, and does not require activation processes.

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“…It has been proven to be an efficient technique for the synthesis of a variety of materials such as nitrides [9,10], hydrides [11], oxides [12,13], and many intermetallics [14][15][16][17]. The CS of β-SiAlON powders is usually performed in a high-pressure N 2 atmosphere under a pressure ranging from 2 to several tens of MPa [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%