Study On The Intermediate Reactions In The Process Of Hydriding Combustion Synthesis Of Magnesium Based Hydrogen Storage Alloys

The new energy, especially, the regenerative clean energy technique is one of the important fields with significant influence on the world economic development in 21 centuries. Among them, the development and applications of hydrogen energy are particularly important. Magnesium-based alloys are potentially the most important hydrogen storage alloys because of their high specific storage capacity, lightweight structure, low environmental impact, and abundant raw materials. Nevertheless, the practical application of Magnesium-based alloys have been limited because of their poor hydriding and dehydriding kinetics and high reaction temperature. Hydriding combustion synthesis (HCS) of magnesium-based alloys is a new production method with merits of saving time, saving energy and simple equipment, which products have excellent hydriding and dehydriding kinetics. Therefore, HCS has drawn great international attention recently because of its potential important values in preparing of magnesium-based hydrogen storage alloys.As a part of the research project of "Study on the reaction mechanism of hydriding combustion synthesis of high active magnesium-based hydrogen storage alloys" financial supported by The National Natural Science Foundation of China (NSFC), the properties of some main intermediate products and final products have been researched in this paper, which include the variety of phases, structures and hydrogen storage performances of the products.In this study, the HCS equipment existed in the laboratory was improved on the system of hydrogen pressure, including the digital measurement and display of the pressure, the system of gas cooling, which is important for the preparation of the intermediate products and the display system of furnace electrical current control.We prepare three intermediate reaction products of magnesium hydriding reaction, dehydriding reaction and magnesium-nickel combustion synthesis reaction by improved existing synthesis equipment. The results from the analyses of XRD show that: (1) Mg₂Ni can be synthesized at 633K with 60min holding time in...