Ti_(17)Cr_(23)V_(55-)xZr_5Fe_x(x=11～16)合金的相结构及储氢特性  

Phase Structure and Hydrogen Storage Properties of Ti17Cr23V55-xZr5Fex（x=11～16） Alloys

作　　者：陈立新[1] 刘剑[1] 王新华[1] 郑坊平[1] 代发帮[1] 陈长聘[1] 

机构地区：[1]浙江大学,浙江杭州310027

出　　处：《稀有金属材料与工程》2006年第5期682-685,共4页Rare Metal Materials and Engineering

基　　金：国家高技术研究与发展计划(2003AA515021);国家自然科学基金(50571089;50271064)资助项目

摘　　要：系统研究了Ti17Cr23V55-xZr5Fex（x=11～16）合金的相结构以及储氢特性。XRD及SEM分析表明，所有合金的主相均为体心立方（bcc）结构的钒基固溶体，并含有σ-FeCr和Cr2Zr等第二相；随着Fe含量的增加，合金中的bcc主相含量和晶胞体积逐渐降低，σ-FeCr相含量逐渐增多，而Cr2Zr相含量几乎恒定。储氢性能测试表明，该系列合金的活化性能和动力学性能都很好，在20℃和4MPa初始氢压条件下首次吸氢即可活化，并且无需氢化孕育期就能快速吸氢。当Fe含量从x=11增加至x=16时，合金的室温最大吸氢量从268ml／g逐渐降低至25lml／g，80℃有效放氢量从153ml／g逐渐降低至137ml／g。研究表明，为了改善合金的有效储氢能力，必须消除合金中不吸氢的σ-FeCr相或者抑制σ-FeCr相的生成。The phase structure and hydrogen storage properties of Ti17Cr23V55-xZr5Fex（x=11～16） alloys have been investigated systematically. XRD and SEM analysis show that all of the alloys consist of a main phase of V-based solid solution with bcc structure and some secondary phases of σ-FeCr and Cr2Zr. With the increase of Fe content in the alloys, the abundance and unit cell volume of the bcc main phase decrease, the σ-FeCr phase content increases, and the Cr2Zr phase content is almost invariable. It is found that all of these alloys have a very good activation behavior and a good kinetic behavior. They are activated during the first hydrogenation time and absorb hydrogen rapidly without hydrogenation gestation time. As the Fe content increases from x= 11 to x= 16, the maximum hydrogen absorption capacity decreases from 268 ml/g to 251 ml/g at 20℃, and the effective hydrogen desorption capacitydecreases from 153 ml/g to 137 ml/g at 80℃. The result shows that eliminating the σ-FeCr phase in the alloy is essential for improving the hydrogen storage ability of these alloys.

关 键 词：金属氢化物 Ti-Cr-V系合金 Fe 相结构 储氢性能 

分 类 号：TG139.7[一般工业技术—材料科学与工程]