LaMgNi_4储氢合金的制备及工艺优化

The Optimum Preparation Conditions of LaMgNi_4 Hydrogen Storage Alloy

采用正交实验对LaMgNi4储氢合金的制备工艺条件进行优化,系统研究了LaMgNi4制备工艺中易于损耗的La、Mg的附加添加量、烧结温度和烧结时间,并用X射线衍射(XRD)对其结构进行了表征。结果表明,La、Mg的附加添加量分别为4%和5%,样品由400℃以3℃/min的速度升温到750℃,并在750℃保温烧结2.5 h可以获得电化学性能较好的LaMgNi4单相合金。

The optimum preparation conditions of LaMgNi4 hydrogen storage alloy were obtained by the orthogonal design test.The influential facorts snch as the reasonable excessive content of La and Mg, the appropriate sintering temperature and time were investigated. A series of LaMgNi4 alloys have been prepared under different conditions and characterized via X-ray diffraction （XRD）. According to the results, the optimum preparation conditions was obtained as follow. The favorable excessive content of La and Mg were 4% and 5%, respectively. At a speed of 3℃/min the sintering-temperaturc rised from 400℃ to 750℃, then at 750℃ for 2.5 h. The sigle-phase LaMgNi4 alloy was prepared under above conditions, and the alloy has preferable discharge capacities and electrochemistry property.