Development of Nb-Ti-Co alloy for high-performance hydrogen separating membrane
Development of Nb-Ti-Co alloy for high-performance hydrogen separating membrane
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高性能氢分离膜用Nb-Ti-Co合金的研制
DOI：
10.1016/j.memsci.2018.08.060
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发表时间：
2018-11
影响因子：
9.5
通讯作者：
Lixian Sun
中科院分区：
文献类型：
--
作者：
Erhu Yan;Haoran Huang;Shuhui Sun;Yongjin Zou;Hailiang Chu;Lixian Sun
在Nb-Ti-Co合金中导致初生α-Nb相和共晶（α-Nb + TiCo）相结晶的成分窗口由于其在氢渗透方面的有利性质而具有高度的技术相关性。为此，一个新的成分窗口的氢渗透Nb-Ti-Co合金的讨论，并在这项研究中首次建立。研究发现，改善氢渗透性和提高耐久性是一对矛盾，且与合金成分密切相关。因此，这些合金的设计的优化是上述两个参数之间的折衷。铸态Nb 45 Ti 25 Co 30在磁导率和耐久性之间表现出良好的平衡。第二，采用熔融纺丝技术成功地制备了Nb-Ti-Co非晶（α-）薄膜。指出了退火条件在决定结晶行为、氢渗透性和耐久性方面的重要性。随后的退火降低了α-膜的氢渗透通量，但与其非晶态相比，显著提高了其热稳定性和耐久性，这归因于微观结构从非晶态向双相结构的变化。通常，在1000 °C下退火12小时后的-Nb 30 Ti 35 Co 35膜显示出15.55 cc H2 cm-2 min-1的高氢渗透通量和在400 °C下约112小时的优异耐久性。第三，在H2/CO或H2/CO2混合气氛下，测试和评价了通过在1000 °C下退火12 h获得的晶化（c-）Nb_（30）Ti_（35）Co_（35）膜对氢气的渗透性。该膜具有相对稳定的H2通量和良好的耐久性，没有腐蚀/化学反应引起的故障。本工作表明，Nb-Ti-Co非晶合金，然后适当的退火是一个有吸引力的候选材料的氢分离膜。
The compositional window leading to the crystallization of primary α-Nb phase and the eutectic (α-Nb + TiCo) phase in Nb-Ti-Co alloys is of high technical relevance due to its favourable properties with respect to hydrogen permeation. To this end, a new compositional window for hydrogen-permeable Nb-Ti-Co alloys is discussed and established for the first time in this study. It is found that improving the hydrogen permeability and increasing the durability are in contradiction with each other, and are closely related to the alloy composition. Optimization of the design of these alloys is therefore a compromise between above-mentioned two parameters. As-cast Nb45Ti25Co30shows a good balance between permeability and durability. Secondly, Nb-Ti-Co amorphous (a-) membranes have been successfully prepared by the melt-spinning technique. The importance of the annealing condition in determining crystallization behaviour, hydrogen permeability and durability is brought out. Subsequent annealing decreases the hydrogen permeation flux of thea- membrane, but significantly increases its thermal stability and durability, compared with its amorphous state, which is attributed to the microstructural change from amorphous to a duplex structure. Typically,a- Nb30Ti35Co35membrane after annealing at 1000 °C for 12 h shows a high hydrogen permeation flux of 15.55 cc H2cm−2min−1and excellent durability of ~ 112 h at 400 °C. Thirdly, the permeability of crystallized (c-) Nb30Ti35Co35membrane obtained by annealing at 1000 °C for 12 h towards hydrogen was tested and evaluated under the mixed atmosphere of H2/CO or H2/CO2. This membrane possesses a relative stable H2flux and good durability without corrosion/chemical reaction-induced failure. The present work demonstrates that Nb-Ti-Co amorphous alloys followed by proper annealing are an attractive candidate material for hydrogen separation membrane.
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