Effect and using of magnesium hydriding reaction in hydriding combustion synthesis of Mg₂NiH₄

In order to reveal the micro-mechanism of hydriding combustion synthesis of Mg₂NiH₄, the effect of intermediate reaction-magnesium hydriding reaction on the final product was studied by changing the holding time of magnesium hydriding reaction. The relationships between magnesium hydriding reaction, synthesis reaction of Mg₂Ni and hydriding reaction from Mg₂Ni to Mg₂NiH₄ were investigated preliminarily. Results indicate that the sufficient hydriding of magnesium not only accelerates the synthesis of Mg₂Ni, also increases the hydriding activity of Mg₂Ni efficiently. Mg₂NiH₄ with high purity can be obtained at lower combustion pressure or with coarser magnesium powder by the use of magnesium hydriding reaction.