팔라듐 합금 수소분리막의 내구성 향상
Improvement in Long-term Stability of Pd Alloy Hydrogen Separation Membranes
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초록
Pd alloy hydrogen membranes for hydrogen purification and separation need thermal stability at high temperature for commercial applications. Intermetallic diffusion between the Pd alloy film and the porous metal support gives rise to serious problems in long-term stability of Pd alloy membranes. Ceramic barriers are widely used to prevent the intermetallic diffusion from the porous metal support. However, these layers resultin poor adhesion at the interface between film and barrier because of the fundamentally poor chemical affinityand a large thermal stress. In this study, we developed Pd alloy membranes having a dense microstructureand saturated composition on modified metal supports by advanced DC magnetron sputtering and heat treatmentfor enhanced thermal stability. Experimental results showed that Pd-Cu and Pd-Ag alloy membranes had considerablyenhanced long-term stability owing to stable, dense alloy film microstructure and saturated composition,effective diffusion barrier, and good adhesive interface layer.
Abstract
Pd alloy hydrogen membranes for hydrogen purification and separation need thermal stability at high temperature for commercial applications. Intermetallic diffusion between the Pd alloy film and the porous metal support gives rise to serious problems in long-term stability of Pd alloy membranes. Ceramic barriers are widely used to prevent the intermetallic diffusion from the porous metal support. However, these layers resultin poor adhesion at the interface between film and barrier because of the fundamentally poor chemical affinityand a large thermal stress. In this study, we developed Pd alloy membranes having a dense microstructureand saturated composition on modified metal supports by advanced DC magnetron sputtering and heat treatmentfor enhanced thermal stability. Experimental results showed that Pd-Cu and Pd-Ag alloy membranes had considerablyenhanced long-term stability owing to stable, dense alloy film microstructure and saturated composition,effective diffusion barrier, and good adhesive interface layer.
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