Zr含量对(Ti-Cr)_(45-x)V_(55)Zr_x(x=1～7)合金微结构及储氢性能的影响  

Effect of Zr Content on the Microstructures and Hydrogen Storage Properties of (Ti-Cr)_(45-x)V_(55)Zr_x(x=1～7) Alloys

作　　者：刘剑[1] 陈立新[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》2005年第12期1871-1874,共4页Rare Metal Materials and Engineering

基　　金：国家高技术研究与发展计划(2003AA515021);国家重点基础研究发展计划(TG2000026406)

摘　　要：系统研究了Zr含量对(Ti-Cr)_(45-x)V_(55)Zr_x(x=1,3,5,7；Ti／Cr=0.7～0.75)合金微结构及储氢性能的影响。XRD及SEM分析表明,当Zr含量x=1时,合金由体心立方(bcc)结构的钒基固溶体主相和微量α-Zr第二相组成；当zr含量增至x=3～7时,合金由bcc钒基固溶体主相和α-ZrCr_2第二相组成。储氢性能测试表明,随着Zr含量的增加,合金的活化性能得到改善；室温最大吸氢量和80℃有效放氢容量均先增后降,并在x=5时达到最高值；P-C-T曲线滞后减小,平台倾斜度增大。在所研究的合金中,(Ti-Cr)_(40)V_(55)Zr_5合金的综合性能最佳,经2次吸放氢循环就活化,室温最大吸氢量可达403 ml／g,80℃有效放氢容量达到230 ml／g。The microstructures and hydrogen storage properties of （Ti-Cr）45.xV55Zrx （x=1, 3, 5, 7; Ti/Cr=0.7～0.75） alloys were investigated systematically. The XRD and SEM analysis show that the alloy with Zr content of x=1 consists of a V-based solid solution main phase with bcc structure and an α-Zr secondary phase; as x=3～7, the alloys consist of a V-based solid solution main phase and an α-ZrCr2 secondary phase. It is found that with the increase of Zr content in the alloys, the activation behavior is improved; the hydrogen absorption capacity at 20℃ and the effective hydrogen desorption capacity at 80℃ all increase first and then decrease, while the maximum values are obtained at x=5; the hysteresis of the P-C isotherm decreases and its slope increases. Among these alloys studied, （Ti-Cr）40V55Zr5 alloy has a good overall property, such as the activation behavior of 2 cycles, the hydrogen absorption capacity of 403 ml/g at room temperature and the effective desorption capacity of 230 ml/g at 80℃.

关 键 词：储氢合金 钒基固溶体 bcc结构 储氢性能 

分 类 号：TG139.7[一般工业技术—材料科学与工程]