Design and characterizations of novel Nb-ZrCo hydrogen permeation alloys for hydrogen separation applications
Design and characterizations of novel Nb-ZrCo hydrogen permeation alloys for hydrogen separation applications
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用于氢分离应用的新型 Nb-ZrCo 氢渗透合金的设计和表征
DOI：
10.1016/j.matchemphys.2018.03.059
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发表时间：
2018-06
影响因子：
4.6
通讯作者：
Lixian Sun
中科院分区：
文献类型：
--
作者：
Erhu Yan;Haoran Huang;Ruonan Min;Fen Xu;Ping Zhao;Yongjin Zou;Hailiang Chu;Huanzhi Zhang;Lixian Sun
新型Nb-ZrCo透氢合金是一种有潜力的氢分离膜材料。研究了NbxZr（95-x）/2Co（105-x）/2（x = 15.40）合金的显微组织、氢渗透行为和抗氢脆性能。在这些合金中发现了三种不同的显微组织，特别是（a）当x < 25时，初生ZrCo相和共晶{bcc-（Nb，Zr）+ B2-ZrCo};（B）当x = 25时，完全共晶;（c）当x > 25时，初生bcc-（Nb，Zr）和共晶。Nb含量在20和30原子%之间的合金呈现更高的渗透结果。Nb含量的增加导致氢渗透率（Φ）增加，但抗脆化性变差，这可以归因于氢溶解度的增加。Nb_（25）Zr_（35）Co_（40）合金在氢渗透性和抗脆化性之间表现出适当的平衡。定向凝固（DS）Nb 25 Zr 35 Co 40的渗透率明显提高，抗氢脆性能也进一步增强，这主要归因于氢溶解度的降低和氢扩散率的显着增加。目前的工作表明，新开发的合金可用作氢分离应用的潜在候选者。
Novel Nb–ZrCo hydrogen permeable alloys are developed as potential membrane materials for hydrogen separation applications. Microstructures, hydrogen permeation behavior and the resistance to hydrogen embrittlement of NbxZr(95-x)/2Co(105-x)/2(x = 15 … 40) alloys are studied. Three different microstructures are found in these alloys, particularly (a) the primary ZrCo phase and eutectic {bcc-(Nb, Zr) + B2-ZrCo} for x < 25, (b) the fully eutectic for x = 25 and (c) the primary bcc-(Nb,Zr) and eutectic for x > 25. Alloys with Nb content between 20 and 30 at.% present higher permeation results. Increase in Nb content lead to higher hydrogen permeability (Φ), but poorer embrittlement resistance, which can be attributed to an increase in hydrogen solubility. Nb25Zr35Co40exhibits an appropriate balance between hydrogen permeability and embrittlement resistance. Permeability is improved apparently and hydrogen embrittlement resistance is also further strengthened for directionally solidified (DS) Nb25Zr35Co40, which is mainly attributed to a decrease in hydrogen solubility and the significant increment of hydrogen diffusivity. The present work demonstrates that the newly developed alloys could be used as potential candidate for hydrogen separation applications.
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