Functional design of palladium-based hydrogen permeable alloy membrane for durability improvement

系统地研究了过渡金属合金化对钯基透氢膜耐久性的影响。在氢渗透反应期间，在附着在Pd基金属膜上的铁颗粒周围形成引起气体泄漏的表面缺陷，即所谓的Kirkendall空隙。发现在钯中加入第5、6族金属、Zr或Re可防止表面缺陷的形成。可以理解的是，对铁颗粒的耐久性的改善可以归因于通过添加这些金属来改变空位形成能而降低了相互扩散速率。W的加入对Pd基合金膜的增韧也是有效的。通过添加仅1摩尔%的用于表面缺陷的防止金属，在不损害高氢渗透性的情况下改善了耐久性。

The alloying effects of the transition metals on the durability for Pd-based hydrogen permeable membranes are investigated systematically. The surface defects, so called Kirkendall voids, that cause a gas leakage, are formed around iron particles adhered on the Pd-based metal membrane during hydrogen permeation reaction. It is found that the formation of surface defects is prevented by the addition of group 5, 6 metals, Zr or Re into palladium. It can be understood that the improvement of the durability against the iron particles may attributable to the decrement of the inter-diffusion rate through the modification of the vacancy formation energy by the addition of these metals. W addition is also effective for toughening of Pd-based alloy membrane. The durability is improved without compromising the high hydrogen permeability by the addition of prevents metals of only 1 mol% for surface defects.