Amorphous Alloy Strip Palladium-based Hydrogen Permeation Preparation And Performance

Metallic glasses have attracted more and more interests since they were produced a few decades ago. Because of its disorder structure of atoms, metallic glasses possess some unique properties, such as high hardness, abrasion resistance and corrosion resistance. Moreover, due to the unique transmission properties of hydrogen and its isotopes, Palladium and Palladium-based alloys are commonly used for the purification and separation hydrogen and its isotopes. Pure palladium has poor mechanical properties by swelling significantly in the hydrogen permeation cycle due to the phase transition when absorbing large quantities of hydrogen gas, resulting into its brittleness or even breaking into pieces. According to the previous research, amorphous alloy does not have the defects such as crystal grain boundaries, dislocations, etc., leading to its uniform chemical composition, single-phase, and much looser than crystal structure. This provides a new idea to improve the hydrogen permeability of Palladium significantly. Therefore, in order to find an effective way to improve the palladium alloy hydrogen permeation performance, it is important to do research on the amorphous forming ability of palladium alloy systems and their hydrogen permeation properties.In this paper, several kinds of Pd-Cu-Si metallic glasses are fabricated at a melt-spun spinning line speed of36m/s～54m/s. Basic analyzing tools, X-ray Diffraction (XRD), Differential Scanning Calorimetry (DSC), Transmission Electron Microscopy (TEM) and Electron Dispersive X-ray spectroscopy (EDS), are used to characterize the ribbons. The electrochemical test method was applied to study the hydrogen diffusion coefficient and hydrogen permeation ability of some selected amorphous samples. The prepared thin ribbon samples obtain well amorphous structure, stable from room temperature to about400℃. The hydrogen permeation test data of our amorphous sample shows comparable hydrogen permeation ability with pure palladium. Thus, it is possible to apply amorphous palladium membrane to hydrogen permeation.