烧结温度对La0.67Mg0.33Ni3合金气态储放氢性能的影响  

Effect of sintering temperature on gas hydrogen absorption-desorption characteristics of La_(0.67)Mg_(0.33)Ni_3 alloys

作　　者：刘静[1,2] 

机构地区：[1]贵州师范大学材料与建筑工程学院,贵州贵阳550001 [2]贵州省无机非金属功能材料重点实验室.贵州贵阳550014

出　　处：《功能材料》2013年第11期1659-1662,共4页Journal of Functional Materials

基　　金：贵州省优秀科技教育人才省长基金资助项目(201019);贵州省高层次人才特助资助项目(TZJF-2009-27)

摘　　要：采用磁场辅助烧结法(MASS)制备La0.67Mg0.33Ni3合金,研究了烧结温度对合金相结构、微观形貌及吸放氢性能的影响。结果显示,973～1123K温度下烧结的合金主相均是PuNi3型结构的(La、Mg)Ni3。活化及动力学测试表明,1023K烧结的合金经过2个循环就能完全活化并在30s内达到最大容量的90%,最大吸氢量达到1.58%(质量分数);PCT结果显示,该合金滞后系数为0.519,吸氢量为1.525%(质量分数),放氢量为1.474%(质量分数),放氢率为0.967,各项性能均为最优。La0.67Mg0.33Ni3 alloys were prepared by magnetic field assisted sintering synthesis（MASS）.The effects of sintering temperature on phase structure,micro-morphology and gas hydrogen absorption-desorption characteristics properties were investigated.The results show that the main phases of alloys produced under 973-1123K are all PuNi3 type（La,Mg）Ni3.The sample prepared under 1023 K can be activated after two hydriding/dehydriding cycles and absorbs 90% of the maximum hydrogen capacity（1.58wt%） within 30s under 300K.The PCT results indicates that the sample prepared at 1023K has the minimum hydriding/dehydriding hysteresis（0.519）,the maximal hydriding/dehydriding capacity（1.525%/1.474wt%） and the maximal dehydrogenated rate（0.967）.

关 键 词：储氢合金 烧结温度 磁场 吸放氢性能 

分 类 号：TG139.7[一般工业技术—材料科学与工程]