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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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Ti0.7Zr0.3(Cr1-xVx)2合金的结构和贮氢性能*
DOI: 10.3724/SP.J.1037.2013.00637, PP. 454-462
Keywords: 贮氢,Laves相,固溶体相,P-C-T曲线,热力学,热重分析
Abstract:
采用XRD和SEM分析了Ti0.7Zr0.3(Cr1-xVx)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bcc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(ΔH)和熵变(ΔS)的变化范围为-7~-28kJ/mol和-35~-95J/(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800K时合金中稳定的氢化物完全分解.
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