Design of Nb-W Hydrogen Permeable Alloy Membranes-Toward improving the durability of long-term hydrogen permeation-

研究了合金化对Nb-W合金膜的力学性能、耐腐蚀性能和透氢性能的影响，为提高Nb-W合金膜的耐久性提供了合金化设计的思路。从实验结果可以清楚地看出，铌的氢溶解量随着钼的加入而降低。钨的加入提高了铌基合金的软化温度。在铌中加入钨和钼，可获得优异的耐热性、高加工性和高氢渗透性。另一方面，通过在Pd催化层和Nb之间形成氧化物层，可以提高Nb膜的耐久性，因为氧化物层阻挡了它们之间的扩散反应。

The alloying effects on the mechanical property, the hydriding property and the hydrogen permeability of Nb-W alloy membrane are investigated to propose the concept for alloy design to improve the durability. From the experimental results, it is clear that the amount of hydrogen solubility for niobium decrease with adding the molybdenum. The softening temperature of niobium based alloy is increased by adding the tungsten. The excellent heat resistance, high workability and high hydrogen permeability can be obtained by adding tungsten with molybdenum into niobium. On the other hand, the durability of Nb membrane can be improved by forming the oxide layer between Pd catalytic layer and Nb, because the oxide layer block the diffusion reaction between them.