V-7.4Zr-7.4Ti-7.4Ni储氢合金的热力学研究  

Thermodynamics of V-7.4Zr-7.4Ti-7.4Ni Hydrogen Storage Alloy

作　　者：赵铭[1] 宋西平[1] 裴沛[1] 张沛龙[1] 

机构地区：[1]北京科技大学新金属材料国家重点实验室,北京100083

出　　处：《稀有金属材料与工程》2009年第4期651-654,共4页Rare Metal Materials and Engineering

基　　金：北京市自然科学基金(2042015)

摘　　要：采用高纯Zr、V、Ti、Ni金属粉末为原料制备了V-7.4Zr-7.4Ti-7.4Ni合金,利用金相显微镜、扫描电镜和X射线衍射仪对合金的显微组织结构进行分析,测试了不同温度下合金的放氢PCT曲线,并根据化学反应热力学公式对其热力学参数进行计算。研究发现:该合金为两相结构,主相为V基固溶体,第二相为Laves相;在室温和353 K时合金的放氢PCT曲线上有明显的压力平台,最大放氢量分别为3.11%和2.31%(质量分数)。热力学计算发现:V基固溶体相为其主要吸放氢相,对放氢PCT曲线上平台的形成有显著的影响;合金放氢PCT曲线平台所对应的氢化物平衡反应温度为358.4 K。In this study, V-7.4Zr-7.4Ti-7.4Ni alloy was prepared from high-pure Zr, V, Ti and Ni metal powders. The microstructure of alloy was investigated by using optical metallograph, scanning electron microscope （SEM） and XRD. The hydrogen desorbing PCT curves have been obtained at different temperatures. The thermodynamic parameters were calculated according to the chemical reaction equilibrium equations. It is found that the microstructure of alloy is consisted of two phases, a main phase of V based solid solution phase, and the second phase of Laves phase. The alloy has remarkable hydrogen storage properties at room temperature and 353 K, the maximum hydrogen desorbing capacities are 3.11 wt% and 2.31 wt%, respectively. From the thermodynamics study it is found that the V based solid solution phase is the primitive phase for desorbing the hydrogen and has great influence on the formation of wide flat pressure plateaus on the PCT curve; the equilibrium temperature of the hydrogen desorbing reaction was calculated to be 358.4 K.

关 键 词：储氢合金 PCT曲线 热力学 

分 类 号：TG139.7[一般工业技术—材料科学与工程]