(Ti-Cr)_(40)V_(55)Zr_5储氢合金的热处理改性  

Modification by Heat Treatment for(Ti-Cr)_(40)V_(55)Zr_5 Hydrogen Storage Alloy

作　　者：葛红卫[1] 刘剑[1] 范修林[1] 杭州明[1] 陈长聘[1] 陈立新[1] 

机构地区：[1]浙江大学材料科学与工程学系,浙江杭州310027

出　　处：《材料科学与工程学报》2008年第4期567-569,553,共4页Journal of Materials Science and Engineering

基　　金：国家高技术研究与发展计划资助项目(2006AA05Z144);浙江省重大科技专项资助项目(2006C11233)

摘　　要：研究了(Ti-Cr)40V55Zr5储氢合金在真空热处理(1473 K下保温2 h和6 h)改性前后的相结构及储氢性能。XRD及SEM分析表明,(Ti-Cr)40V55Zr5铸态合金由BCC结构的固溶体主相和ZrCr2基第二相组成;经过热处理后,合金的BCC主相的晶胞体积有所增大,除了BCC主相和ZrCr2基第二相外,还出现微量的富Ti第三相。储氢性能测试表明,热处理后(Ti-Cr)40V55Zr5合金的动力学性能和活化性能均得到改善,室温最大吸氢量略微降低,但P-C-T曲线放氢压力平台倾斜度降低,平台宽度稍有增大,80℃有效放氢量增大。研究表明,在1473 K下经2 h热处理改性的(Ti-Cr)40V55Zr5合金具有较好的综合性能,首次吸氢即可活化,室温吸氢量为401 ml.g-1,80℃有效放氢量达到240 ml.g-1。The change in the phase structure and hydrogen storage properties of （Ti-Cr）10 V55 Zr5 alloys after modification by heat treatment at 1473 K for 2 h or 6 h was investigated. The XRD and SEM analyses show that the as-cast （Ti-Cr）40 V55 Zr5 alloy consists of a V-based solid solution main phase with BCC structure and a ZrCr2 based secondary phase, and the heat-treated alloy has a little Ti-rich phase besides the BCC main phase and ZrCr2 based secondary phase. It is found that the heat treatment leads to an increase of the kinetics and activation behavior of （Ti-Cr）40 V55 Zr5 alloy, and a slight decrease of the hydrogen absorption capacity at 20℃. However, the heat treatment increases the effective hydrogen desorption capacity at 80℃ due to the decreased gradient and the increased width of the plateau of the P-C isotherm. The result shows that the （Ti-Cr）40 V55 Zr5 alloy treated at 1473 K for 2 h has a good overall property, such as the activation behavior of 1st cycle, the hydrogen absorption capacity of 401 ml · g^-1 at 20℃ and the effective desorption capacity of 240 ml · g^-1 at 80℃.

关 键 词：Ti-Cr-V-Zr系储氢合金 热处理 储氢性能 相结构 

分 类 号：TG139.7[一般工业技术—材料科学与工程]