Thin film Palladium-Ytrium membranes for hydrogen separation

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http://eprints.org/relation/isVolatileVersionOf http://etheses.bham.ac.uk/id/document/2281 http://eprints.org/relation/ispreviewThumbnailVersionOf http://etheses.bham.ac.uk/id/document/2281 http://eprints.org/relation/isVersionOf http://etheses.bham.ac.uk/id/document/2281 archive 4031 disk0/00/00/09/24 2010-09-13 12:17:01 2019-01-23 09:53:08 2011-07-19 16:26:03 thesis show 0 Fletcher Sean Speight John Book David University of Birmingham Thin film Palladium-Ytrium membranes for hydrogen separation unpub TN 10col_ephy The permeability of hydrogen in thin film Pd-Y composite membranes has been investigated for the first time. Thin (5 µm) Pd-Y films were deposited onto macroporous 316L stainless steel substrates by magnetron sputtering. Prior to deposition, a novel laser melting technique was employed in an attempt to reduce the surface roughness and pore size, thus facilitating the deposition of defect-free films. The active hydrogen transport mechanisms of each layer have been determined and the observed hydrogen permeability was analysed using a series resistance type model. The porous substrate was found to contribute significantly to the total transport resistance, and was the predominant source of the non diffusion limited permeation. After correcting for the substrate effects, the permeability of thin film Pd-Y closely matched that in bulk Pd-Y alloys. 2010-07 2009-10 graduation eng This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder. ubira@lists.bham.ac.uk public 268 University of Birmingham School of Metallurgy and Materials d_ph na 2010-07 graduation