Metallic materials having a porosity of 70% or more are generally referred as highly porous metals. In this study, pure nickel were produced by powder metallurgy route. the production process, potassium bromide was used both space-holder phase and an oxidation shield. method, firstly, powders mixed according to desired void ratio. The obtained nickel-potassium pressed in hydraulic press turned ...

In this work, one-dimensional NiHPO 4 nanotubes are successfully fabricated on nickel foam by hydrothermal reaction, in which a dissolution equilibrium between phosphates is controlled tuning the proportion of mixed solvent and amounts KOH. As broken, morphology transfers from solid nanowires to hollow nanotubes. The resulting 1D exhibit good electrocatalytic activity stability oxygen evolution...

Foam injection is becoming a standard conditioning agent when tunnelling with an earth-pressure balanced shield, resulting in an increasing interest in this technique. The technique is mostly based on empirical rules and experience. To be able to determine what foam and how may foam has to be injected for different soils, it is necessary to know the mechanical parameters of the foam-water-soil ...