Nb–HfCo alloys with pronounced high hydrogen permeability: A new family of metallic hydrogen permeation membranes
Nb–HfCo alloys with pronounced high hydrogen permeability: A new family of metallic hydrogen permeation membranes
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DOI：
10.1016/j.ijhydene.2014.03.173
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发表时间：
2014-05
影响因子：
7.2
通讯作者：
E. Yan;Xinzhong Li;Dongmei Liu;M. Rettenmayr;Yan-Qing Su;Jingjie Guo
中科院分区：
文献类型：
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作者：
E. Yan;Xinzhong Li;Dongmei Liu;M. Rettenmayr;Yan-Qing Su;Jingjie Guo
研究了NbxHf(100−x)/2Co(100−x)/2（x= 15…40）合金的显微组织和渗氢性能。成分nb30hf35co35形成了全共晶组织。具有x（20 <x< 30）的合金含有初生HfCo和共晶{bcc-(Nb, Hf) + Bf-HfCo}相，而具有x（x≤20）的合金还含有由三元共晶反应产生的少量Hf2Co相。含x（x bbb30）的合金含有初生bcc-(Nb, Hf)和共晶相，具有明显的高氢渗透性和抗氢脆性。渗透率随初生bcc-(Nb, Hf)相体积分数的增加和Nb含量的增加而增加。在673 K时，nb40hf30co30的磁导率最高，为4.96 × 10−8mol H2m−1s−1Pa−1/ 2mol。这是纯Pd的3.5倍左右，也是目前报道的最高值。
Microstructures and hydrogen permeability of the NbxHf(100−x)/2Co(100−x)/2(x= 15…40) alloys were investigated. The composition Nb30Hf35Co35resulted in a fully eutectic microstructure. Alloys withx(20 <x< 30) contain the primary HfCo and the eutectic {bcc-(Nb, Hf) + Bf-HfCo} phases, while those withx(x≤ 20) additionally contain small fractions of the Hf2Co phase that results from a ternary eutectic reaction. Alloys withx(x> 30) contain the primary bcc-(Nb, Hf) and the eutectic phases, which exhibits pronounced high hydrogen permeability and large resistance to hydrogen embrittlement. The permeability increases with increasing Nb content and increasing volume fraction of the primary bcc-(Nb, Hf) phase. Nb40Hf30Co30shows the highest permeability, particularly 4.96 × 10−8mol H2m−1s−1Pa−1/2at 673 K. This is about 3.5 times higher than that of pure Pd and also the highest value among all the currently reported ones.