MICROSTRUCTURE AND HYDROGEN PERMEATION CHARACTERISTIC OF NEAR EUTECTIC Nb-Ti-Co HYDROGEN SEPARATION ALLOY

doi:10.3724/SP.J.1037.2013.00474

Acta Metall Sin

2014, Vol. 50

Issue (1): 71-78 DOI: 10.3724/SP.J.1037.2013.00474

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MICROSTRUCTURE AND HYDROGEN PERMEATION CHARACTERISTIC OF NEAR EUTECTIC Nb-Ti-Co HYDROGEN SEPARATION ALLOY

YAN Erhu, LI Xinzhong(

), TANG Ping, SU Yanqing, GUO Jingjie, FU Hengzhi

School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001

Cite this article:

YAN Erhu, LI Xinzhong, TANG Ping, SU Yanqing, GUO Jingjie, FU Hengzhi. MICROSTRUCTURE AND HYDROGEN PERMEATION CHARACTERISTIC OF NEAR EUTECTIC Nb-Ti-Co HYDROGEN SEPARATION ALLOY. Acta Metall Sin, 2014, 50(1): 71-78.

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Abstract

Because of the high hydrogen permeability and high resistance to hydrogen embrittlement of Pd-based alloys, Pd-Ag alloys have been used as hydrogen permeation membranes for separation and purification of hydrogen gas. However, Pd is too expensive for large-scale industrial applications as hydrogen permeation membranes. The development of alternative membrane materials with higher hydrogen purification efficiency and lower cost is therefore strongly desired. From the viewpoint of the hydrogen permeability, some bcc metals such as Nb, V and Ta are promising candidates since their predicted hydrogen permeability are larger than that of Pd. Nb-Ti-Co ternary alloy has been considered as the best candidate because of lower cost, good thermal stability, the high hydrogen permeability and high resistance to hydrogen embrittlement. In this work, the eutectic composition in Nb-Ti-Co alloy was probed and verified through Bridgman directional solidification experiment. Microstructures, hydrogen permeation properties and hydrogen embrittlement of near eutectic Nb-Ti-Co alloy were investigated and compared with those of pure Pd. The results indicate that the eutectic composition in Nb-Ti-Co alloy is Nb₃₁Ti₃₅Co₃₄, and its solidification microstructures contain only the Nb(Ti, Co) and TiCo phase, which shows regular coupled growth by Bridgman directional solidification at the rate of 5 μm/s. The eutectic alloy shows the higher hydrogen permeability of 2.7×10^-8 mol/(m·s·Pa^0.5) at 673.5 K, which is 1.72 times higher than that of Pd alloy. The hydrogen permeability decreases with the decrease of Ti/Co ratio at the same Nb content. A slight crack first appears in the TiCo phase, which is the source of cracks in the membrane, and then the cracks propagate along the edge of the membrane. When the volume fraction of TiCo phase is less than 5%, the eutectic Nb(Ti, Co)+TiCo phases may offset the crack in the TiCo phase, thus the membrane exhibits large resistance to the hydrogen embrittlement.

Key words: Nb-Ti-Co alloy microstructure hydrogen permeability hydrogen embrittlement

Received: 05 August 2013

ZTFLH:

TG139

Fund: Supported by National Natural Science Foundation of China (Nos.51274077 and 51271068) and Fundamental Research Funds for the Central Universities (No.HIT.NSRIF.2013002)

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	Erhu YAN
	Xinzhong LI
	Ping TANG
	Yanqing SU
	Jingjie GUO
	Hengzhi FU

URL:

https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00474 OR https://www.ams.org.cn/EN/Y2014/V50/I1/71

Fig.1

Nb-Ti-Co 氢分离合金成分设计及其于相图位置示意图

Fig.2

不同成分下Nb-Ti-Co合金的XRD谱

Fig.3

N5和N7合金的SEM像

Table 1 EDS results of Nb-Ti-Co alloy measured at the different positions shown in Fig.3(atomic fraction / %)

Fig.4

近共晶点处N1~N9合金的微观组织

Fig.5

定向凝固N9合金纵截面的显微组织

Fig.6

N6~N9 合金成分的( J· δ)与 $Δ P 1 / 2 = P H 1 / 2 - P L 1 / 2$ 关系曲线

Fig.7

N6~N9合金的氢渗透系数Ф与温度T的Arrhenius关系曲线

Fig.8

N3合金氢渗透后的宏观和微观断裂形貌

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