Hydrides, combustion synthesis

Saita et al. [215] used hydriding combustion synthesis for a direct production of TiFe. In the experiments, an exothermic reaction of Ti with hydrogen (Ti -i- i = TiHj + 144 kJ) was utilized for HCS of TiFe because the adiabatic flame temperature of this reaction was estimated to be 2,000°C, which is sufficiently high for melting both iron and titanium. A 1 1 molar mixture of elemental Ti and Fe pow-... 

I. Saita, M. Sato, H. Uesugi, T. Akiyama, Hydriding combustion synthesis of TiFe, ... 

In the past few years there still have been some research efforts focused on Mg NiH. The Akiyama s group in Japan [20-22] has developed a hydriding combustion synthesis technique for the direct fabrication of Mg NiH. The results showed that the product of Mg NiH from the hydriding combustion synthesis absorbed the maximum (3.4-3.6 wt%) near the theoretical value just after synthesis without any activation process. 

L. Li, T. Akiyama, J. Yagi, Activation behaviors of Mg NiH at different hydrogen pressures in hydriding combustion synthesis , Int. J. Hydrogen Energ. 26 (2001) 1035-1040. 

X. Liu, Y. Zhu, L. Li, Hydriding and dehydriding properties of nanostructured Mg Ni aUoy prepared by the process of hydriding combustion synthesis and subsequent mechanical grinding , /. Alloys Compd 425 (2006) 235-238. 

L. Li, I. Saita, K. Saito, T. Akiyama, Effect of synthesis temperature on the purity of product in hydriding combustion synthesis of Mg2NiH4 , J. Alloys Compd. 345 (2002) 189-195. 

Liu X, Zhu Y, Li L (2007), Hydriding characteristics of Mg2Ni prepared by mechanical milling of the product of hydriding combustion synthesis , Int. J. Hydrogen Energy, 32, 2450-2454. 

The finely divided hydride produced by pyrolysis is pyrophoric in air, while synthesis from the elements produces a substantially air-stable product [1]. That prepared by reduction of butylmagnesium bromide with lithium tetrahydroalumi-nate is pyrophoric and reacts violently with water and other protic compounds [2], The hydride produced from magnesium anthracene has a very large specific surface area and is pyrophoric [3], In the context of use of the hydride for energy storage purposes, ignition and combustion behaviour of 100-400 g portions were studied, as well as the reaction with water [4],... 

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