Permeability of Hydrogen and Deuterium in Niobium Film
ZHOU Yanyan1,2, ZHOU Xin2, CHEN Chang’an2, WANG Wei2, WANG Zhanlei2, RAO Yongchu2, LIANG Chuanhui2, ZHOU Yuanlin1
1 State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, Southwest University of Science and Technology, Mianyang 621010; 2 Science and Technology on Surface Physics and Chemistry Laboratory, Jiangyou 621907
Abstract: Refractory metal niobium is considered as a substitute of palladium for hydrogen permeation, thanks to its good mechanical strength, high hydrogen permeation rate and low cost. Effective removal of niobium oxide on the surface of niobium film is the key for acquiring fast hydrogen permeation. In this work, mechanical polishing and high temperature hydrogen reduction were adopted to remove the intrinsic oxides on the surface of niobium film, and the hydrogen and deuterium permeability of treated nio-bium film were evaluated. The results showed that mechanical polishing combined with high temperature hydrogen reduction can effectively remove the niobium oxide. The permeability of hydrogen and deuterium in niobium film at the temperature range of 600 ℃ to 800 ℃ were ΦH=4.98×10-6exp(-6 406.9/T)mol·m-1·s-1·Pa-0.5 and ΦD＝3.51×10-6exp(-6 418.8/T)mol·m-1·s-1·Pa-0.5. At the same temperature, the permeability of hydrogen isotopes in niobium is higher than that of CLAM steel and lower than that of Pd8.5Y0.19Ru alloy, which could be attributed to a slight retardation effect of surface residual oxide on hydrogen isotope penetration.
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2018, Vol. 32 
