Ti0.7Zr0.3(Cr1-xVx)2合金的结构和贮氢性能

金属学报, 2014, 50(4): 454-462. doi: 10.3724/SP.J.1037.2013.00637

Ti0.7Zr0.3(Cr1-xVx)2合金的结构和贮氢性能

马坪 ^1, , 吴二冬 ^2, , 李武会 ^3, , 孙凯 ^4, , 陈东风 ^5,

1.中国科学院金属研究所沈阳材料科学国家(联合)实验室,沈阳,110016

2.中国科学院金属研究所沈阳材料科学国家(联合)实验室,沈阳,110016

3.河南科技大学材料科学与工程学院,洛阳,471003

4.中国原子能科学研究院,北京,102413

5.中国原子能科学研究院,北京,102413

基金项目: National Basic Research Program of China(2010CB833101) Supproted by Natioal Natural Science Foundation of China(11079043) 国家自然科学基金项目11079043和国家重点基础研究发展计划项目2010CB833101资助

关键词：贮氢 , Laves相 , 固溶体相 , P-C-T曲线 , 热力学 , 热重分析

MICROSTRUCTURES AND HYDROGEN STORAGE PROPERTIES OF Ti0.7Zr0.3(Cr1-xVx)2 ALLOYS

Keywords： hydrogen storage , Laves phase , solid solution phase , pressure-concentration-temperature (P-C-T) curve , thermodynamics , DTA-TG analysis

采用XRD和SEM分析了Ti07Zr0.3(Cr1-xV)2(X=0.1,0.2,0.3,0.4)合金的相组成、晶体结构和元素成分;采用Sieverts装置、差热和热重分析仪(DTA-TG)测量了合金的活化性能、吸放氢P-C-T曲线、热力学参数及高温放氢特征.结果表明,合金为多相组织,存在C36(P63/mmc)和C15(Fd3m)2种Laves相和几种晶格常数近似的钒基bee固溶体相.当V含量较低时,合金主要由C36型Laves相和少量bcc固溶体相组成.随着V含量增加,C36型转变为C15型Laves相,其中第3种(C层)堆垛存在几率增加,而且合金中bcc固溶体相含量增加.合金在2MPa氢压和常温下能迅速活化;表面氧化后,x=0.1和0.2合金仍表现出优异的活化性能.随着V含量增加,合金的贮氢量增加、平台压力减小.合金氢化的相对偏摩尔焓变(△H)和熵变(△S)的变化范围为-7～-28 kJ/mol和-35～-95 J/(mol·K).DTA-TG分析表明,合金氢化物分解主要出现在500～600K温度区间,并呈现对应不同类型氢化物的2个分解温度,加热到800 K时合金中稳定的氢化物完全分解.

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