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| Fabrication and characterization of Pd/porous TiAl alloy composite membrane for hydrogen separation |
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Cite this article:
. Fabrication and characterization of Pd/porous TiAl alloy composite membrane for hydrogen separation. Chin J Mater Res, 2008, 22(5): 454-460.
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Abstract Porous TiAl alloy substrate , whose maximum pore size is about 2μm, was fabricated with titanium and aluminum elemental powders by P/M technique with pressure sintering.The palladium composite membrane was fabricated by electroless plating. It was proved that the membrane obtained in the experiment was pure palladium by X-Ray diffraction result. Scanning electron microscopy(SEM) showed that the surface membrane was dense and its thickness was about 10μm. The advantages of porous TiAl alloy as substrate of palladium membrane were discussed through three aspects (lattice matching, Linear expansion coefficients proximity and controllability of pore structure ). The trace analysis results of chemical constitutions of electroless plating baths after the electroless plating showed that the influence of TiAl alloy substrate to the stability of electroless plating baths was slight. The interdiffusion in high temperature between TiAl alloy and palladium was analysed by a heat treatment at 600℃ for 96 hours. A gas permeation experiment was conducted under temperature of 400–500℃ and pressure of 0.02–0.18MPa. Hydrogen permeance and selectivity of hydrogen/nitrogen (H2/N2) were 6.8×10−7 molm−2 s−1 Pa−1 and greater than 628 at 500℃, respectively.
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Received: 22 October 2007
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