Multi-Level Porosity Silver Foams by Powder Processing Method

Thanachache Preuksarattanawut; Ekasit Nisaratanaporn; Seksak Asavavisithchai

doi:10.3139/120.110378

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Multi-Level Porosity Silver Foams by Powder Processing Method

Thanachache Preuksarattanawut , Ekasit Nisaratanaporn und Seksak Asavavisithchai

Veröffentlicht/Copyright: 26. Mai 2013

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Abstract

Silver foams with 70% porosity have been produced by the sintering and dissolution process (SDP) of fine silver powder. The powder was obtained from the reduction of rod-shaped silver sulfate, using glycerol mixed with sodium hydroxide as reducer and reaction accelerator, respectively. The foam shows three-level porosities, ranging from nanometer to millimeter level. The nanopores were created during the reduction process. The micropores were formed by the dissolution of remaining silver sulfate. The millipores were made from the removal of disaccharide powders. The pore architecture is unique and can be tailored by varying material and process parameters such as silver sulfate and disaccharide morphologies, reduction temperature and time as well as volume fraction of materials.

Kurzfassung

Silberschäume mit einer Porosität von 70% wurden durch des Sinter- und Auflösungsprozesses (sintering and dissolution process — SDP) von feinem Silberpulver hergestellt. Das Pulver wurde aus der Reduktion von stabförmigem Silbersulfat gewonnen, wobei eine Mischung aus Glycerin und Natronlauge, die sowohl als Reduktionsmittel sowie als Reaktionsbeschleuniger fungiert, verwendet wurde. Der entstehende Schaum zeigte eine Porosität über die Größenbereiche, die vom Nanometer- bis in den Millimeter-Bereich reichte. Die Nanoporen wurden während des Reduktionsprozesses gebildet. Die Mikroporen entstanden aus der Auflösung des verbliebenen Silbersulfates. Die Milliporen wurden durch Entfernung des Disaccharid-Pulvers gebildet. Die Porenarchitektur ist einzigartig und kann mittels Variation der Materialeigenschaften und Prozessparameter, wie beispielsweise der Reduktionstemperatur und Reduktionszeit sowie des Volumenanteils der Materialien und der Silbersulfat- bzw. Disaccharid-Morphologie, maßgeschneidert werden.

Seksak Asavavisithchai and Ekasit Nisaratanaporn, assistant professors, are working at the Department of Metallurgical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand. Seksak Asavavisithchai received his Ph.D. from the University of Nottingham, UK, in the field of Materials Design and Engineering. His research interests are metallic foams, powder metallurgy, metal-matrix composite (MMC) and failure analysis.

Thanachache Preuksarattanawut, formerly master student, was also working at the Department of Metallurgical Engineering, Faculty of Engineering, Chulalongkorn University, Bankok, Thailand.

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Published Online: 2013-05-26

Published in Print: 2012-10-01

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https://doi.org/10.3139/120.110378