Improving hydrogen storage properties of Laves phase related BCC solid solution alloy by SPS preparation method

Electric Current Activation of Sintering: A Review of the Pulsed Electric Current Sintering Process

“…While the benefits cited above provided a significant impetus for the increased interest in PECS, the claims of better or improved properties of materials sintered by this method have generated an even stronger push for its use. Improvements in a variety of properties have been reported, 23–29 including cleaner grain boundaries in sintered ceramic materials, 30 a remarkable increase in the superplasticity of ceramics, 31,32 higher permittivity in ferroelectrics, 33 improved magnetic properties, 34 reduced impurity segregation at grain boundaries, 32 higher chemical stability, 25 higher hydrogen storage capacity in BCC solid metallic solutions, 35 better thermoelectric properties, 36,37 improved mechanical properties, 38 and better optical properties 39 . In the most recent work on impurity segregation, Mitzuguchi et al 12 showed that ZrB 2 sintered by PECS had lower levels of impurities in the grain boundaries and in the grains than samples sintered by hot pressing.…”

Hydrogen absorption/desorption properties in the TiCrV based alloys

“…This phenomenon is due to the hydrogen permeates through the first oxide layer of the Laves phase C14 having a thickness less than the bcc phase, this behavior was also described by Zhouming et al 9 . This leads cracking along the grain boundaries resulting in exposure of new surfaces; therefore, more hydrogen can penetrate into the alloy bulk, as was observed by Pei et al 10 . So this indicates that the additives Nb an 4%Zr 7 Ni 10 act as catalysts mainly due to the formation of Laves phase that induces a rapid reaction with hydrogen, allowing easy pulverization compared with alloys of bcc structure which exhibit high hardness.…”

Hydrogen Storage Properties of Ti$_{15.4}$Zr$_{30.2}$Mn$_{44}$V$_{5.4}$Сr$_5$ Alloy Produced by Induction and Arc Melting

“…The authors of [16] proved that changing the method of the material production can significantly increase the hydrogen capacity and improve the kinetics of the hydrogen desorption process. Comparing the hydrogen storage properties of the alloy V 35 (Ti, Cr) 51 (Zr, Mn) 14 produced by the techniques of sintering in the plasma of spark discharge (SPS method) and induction melting, the authors noted that the kinetic parameters of the hydrogenation process are the same, but the hydrogen capacity is different.…”

“…These significant differences in the amount of absorbed and desorbed hydrogen are explained by the fact that in the case of the SPS technique there is no diffusion redistribution of elements that form the Laves phase (manganese) in the b.c.c.-solid solution. Based on the literature data [17], the authors of [16] claim that the introduction of manganese in the Tibased b.c.c.-solid solutions leads to a decrease in the lattice parameter and the amount of absorbed hydrogen. Summarizing all the above, we can say that in most cases changing the method of alloy production from casting to other techniques leads to a deterioration in the kinetics of sorption-desorption processes, and most importantly to a decrease of hydrogen capacity.…”