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In this work, the Nb-based Nb42Ni40Co 18-xZrx (x = 0, 4, 12) and Nb42Ni 32Co6Zr12M8 (M = Ta, Ti, Zr) amorphous alloy ribbons were successfully prepared by single roller melt-spinning technique. These amorphous alloys exhibit high thermal stability with the crystallization temperature (Tx) exceeding 850 K. It has been found that Tx of the Nb42Ni40Co 18 alloy decreased with Zr addition, while hydrogen permeability increased linearly with Zr content. The hydrogen permeability of the Nb 42Ni40Co18, Nb42Ni 40Co14Zr4, Nb42Ni 40Co6Zr12 and Nb42Ni 32Co6Zr20 amorphous alloys at 673K are 0.03 × 10-8, 0.23 × 10-8, 0.69 × 10 -8 and 1.40 × 10-8 mol·m -1·s-1·Pa-1/2, respectively. It is noticed that hydrogen permeability of the Nb42Ni 32Co6Zr20 alloy is comparable with that of Pd23% Ag alloy (1.14 × 10-8). Meanwhile, permeability of the above mentioned alloy decreased to 60% of the initial value while it still maintains amorphous structure after 24 h long term durability test. Both thermal stability and hydrogen permeability are enhanced by substituting 8 at% Ni with Ta or Ti in the Nb42Ni40Co6Zr12 alloy. The present result indicates that the Nb-based amorphous alloys possess the potential of applying as a kind of hydrogen permeable membrane at high temperature. © 2013 The Japan Institute of Metals and Materials.

Hydrogen Permeable Nb-Based Amorphous Alloys with High Thermal Stability