By taking the Lao.67 Mgo.33 Ni3 alloys prepared assisted by a high magnetic field as the research object, the phase structure, micro-morphology, activation characteristics and hydriding/dehydriding kinetics properties were investigated through XRD, SEM and constant volume method. The results show that the main phase of alloys produced by MASS was PuNi3 type (La, Mg)Ni3. The alloy particle exhibits a rough and porous surface. The sample prepared under IT magnetic field can be activated after three hydriding/dehydriding cycles and the maximum hydriding capacity was 1. 47wt%. The kinetic analysis indicates that the optimal sample which prepared under IT magnetic field can absorb hydrogen saturatedly at room temperature within 50s under 1. OMPa H2 and finished hydrogen desorption at 333K within 400s under 0. OOlMPa H2. However, the reversible hydrogen desorption amount was relatively low.%以磁场辅助烧结法(MASS)制备的La0.67 Mg0.33Ni3合金为对象,采用XRD、SEM及定容法研究了合金的相结构、微观形貌、活化能力及吸放氢动力学性能.结果显示,MASS制备的合金主相为PuNi3型结构的(La,Mg) Ni3.合金颗粒表面粗糙,呈现多孔结构.1T磁场下合成的合金经过3个循环就可完全活化,最大吸氢量达到1.47％(质量分数).动力学测试表明,该合金在室温、1MPa氢气下50s内吸氢达到饱和；在333K、0.001 MPa氢气下400s内可完成放氢,具有最佳的动力学性能,但合金可逆放氢量较低.
展开▼
