Hydrogen-storage properties of gravity cast and melt spun Mg–Ni–Nb2O5 alloys
Hydrogen-storage properties of gravity cast and melt spun Mg–Ni–Nb2O5 alloys
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DOI：
10.1016/j.ijhydene.2008.12.015
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发表时间：
2009-02
影响因子：
7.2
通讯作者：
Seong‐Hyeon Hong;S. Kwon;Jong-Soo Bae;M. Song
中科院分区：
文献类型：
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作者：
Seong‐Hyeon Hong;S. Kwon;Jong-Soo Bae;M. Song
将重力铸造Mg-23.5wt%Ni与Spex球磨的Nb 2 O 5在正己烷中水平球磨，制备了95%（重力铸造Mg-23.5Ni）-5%Nb2O5合金。采用行星式球磨法对523 K热处理1h的Mg-23.5wt%Ni合金进行了球磨，并与NaCl球磨制备的Nb_2O_5进行了比较。活化后的90%（快淬Mg-23.5Ni）-10%Nb2O5合金比活化后的95%（重力铸造Mg-23.5Ni）-5%Nb2O5合金具有更高的析氢和放氢速率，这是由于Mg-23.5Ni中细小的Mg 2Ni相分布均匀，Nb 2 O 5的加入使Mg-23.5Ni中的Mg颗粒尺寸有效减小。活化后的90%（ms Mg-23.5Ni）-10%Nb2O5合金在573 K、12 bar H2下吸氢10 min，吸氢量为4.70wt%H，在573 K、1.0bar H2下放氢25 min，放氢量为4.75wt%H。
95%(gravity cast Mg–23.5Ni)–-5%Nb2O5alloy was prepared by horizontal ball milling in n-hexane of gravity cast Mg–23.5wt%Ni with Spex milled Nb2O5. Melt spun Mg–23.5wt%Ni after heat treatment at 523K for 1h was also ground by planetary ball milling with finer Nb2O5prepared by milling with NaCl. The activated 90%(melt spun Mg–23.5Ni)–10%Nb2O5alloy shows higher hydriding and dehydriding rates than the activated 95%(gravity cast Mg–23.5Ni)–5%Nb2O5alloy, thanks to the homogeneous distribution of fine Mg2Ni phase in melt spun Mg–23.5Ni and the finer Nb2O5addition to melt spun Mg–23.5Ni, which leads to the effective diminution of the Mg particle size. The activated 90%(ms Mg–23.5Ni)–10%Nb2O5alloy absorbs 4.70wt%H at 573K under 12bar H2for 10min, and desorbs 4.75wt%H at 573K under 1.0bar H2for 25min.