COST-EFFECTIVE METHOD FOR PRODUCING SELF SUPPORTED PALLADIUM ALLOY MEMBRANES FOR USE IN EFFICIENT PRODUCTION OF COAL DERIVED HYDROGEN

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During the last quarter, new procedures were developed and implemented to improve reliability and repeatability of release characteristics from the temporary substrate (i.e., silicon wafer) and to minimize through-thickness defects in a 6-inch diameter film, 3 microns in thickness. With the new procedures, we have been able to consistently produce essentially stress free films, with zero or minimal defects (less than 5) across a 6-inch diameter area. (It is important to note that for those films containing pinholes, a procedure has been developed to repair the pinholes to form a gas tight seal). The films are all within the identified ... continued below

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Lanning, B. & Arps, J. October 28, 2005.

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Description

During the last quarter, new procedures were developed and implemented to improve reliability and repeatability of release characteristics from the temporary substrate (i.e., silicon wafer) and to minimize through-thickness defects in a 6-inch diameter film, 3 microns in thickness. With the new procedures, we have been able to consistently produce essentially stress free films, with zero or minimal defects (less than 5) across a 6-inch diameter area. (It is important to note that for those films containing pinholes, a procedure has been developed to repair the pinholes to form a gas tight seal). The films are all within the identified tolerance range for composition (i.e., 60 {+-} 0.2 % Pd). A number of these films have subsequently been shipped to IdaTech for evaluation and integration into their test module. Colorado School of Mines continued their high temperature evaluation of 6 micron thick, sputtered Pd-Cu films. Pure hydrogen permeability increased up to 400 C while the membrane was in the {beta}-phase and dropped once the temperature increased to over 450 C. Above this temperature, as confirmed by the binary phase diagram, the film transforms into either a mixed {alpha}/{beta} or pure {alpha} phase. The same trend was observed for a baseline 25 micron-thick foil (from Wilkinson) where the pure hydrogen permeability increased with temperature while the membrane was in the {beta}-phase and then decreased upon transformation to the {alpha} phase.

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  • Report No.: none
  • Grant Number: FC26-03NT41849
  • DOI: 10.2172/882510 | External Link
  • Office of Scientific & Technical Information Report Number: 882510
  • Archival Resource Key: ark:/67531/metadc891727

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • October 28, 2005

Added to The UNT Digital Library

  • Sept. 23, 2016, 2:42 p.m.

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  • Dec. 5, 2016, 1:18 p.m.

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Lanning, B. & Arps, J. COST-EFFECTIVE METHOD FOR PRODUCING SELF SUPPORTED PALLADIUM ALLOY MEMBRANES FOR USE IN EFFICIENT PRODUCTION OF COAL DERIVED HYDROGEN, report, October 28, 2005; United States. (digital.library.unt.edu/ark:/67531/metadc891727/: accessed November 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.