氢化燃烧合成法制备镁基储氢合金Mg2NiH4

采用自行设计制作的反应设备，研究了氢化燃烧合成法制备Mg2NiH4的工艺参数。主要探讨了合成反应动力学因素：压力、合成温度、氢化保温时间对产物纯度的影响。实验结果表明，在初始压力为1．5MPa下，合成条件分别为：合成温度808K，合成保温时间120min，氢化保温时间60min及合成温度850K，合成保温时间60min，氢化保温时间90min时均可制备出纯的Mg2NiH4。

Preparation of Mg -based hydrogen storage alloy by hydriding combustion synthesis

Hydriding combustion synthesis of Mg_2NiH_4 was conducted at different heat treatment regime and hydrogen pressures in self - developed reaction apparatus. The relationships among the purity, hydrogen pressure, synthesis temperature and holding time at hydrogenation and at maximum temperature were mainly studied. Pure Mg_2NiH_4 is obtained in the initial pressure of 1.5MPa, holding 120min at synthesis temperature of 808K and 60min at Mg_2Ni hydriding temperature of 653K or holding 60min at synthesis temperature of 850K and 90min at 653K. The results indicate that a mechanism of liquidtrigger, liquid-solid and solid-solid diffusion reaction between magnesium and nickel plays an important role in the combustion synthesis of Mg_2Ni.