Preparation and characterization of ceramics laser alloyed with WO3 and CuO nanopowders

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dc.contributor.author Schreck, Sabine en_US
dc.contributor.author Sachse, S. en_US
dc.contributor.author Rohde, Magnus en_US
dc.date.accessioned 2007-12-07T14:24:12Z
dc.date.available 2007-12-07T14:24:12Z
dc.date.issued 2007 en_US
dc.identifier.citation European Nano Systems Worshop, Paris, France, 03-04 December 2007, p. 57-62 en_US
dc.identifier.isbn 978-2-35500-003-4 en_US
dc.identifier.uri http://hdl.handle.net/2042/14133
dc.description.abstract A well defined surface layer of a ceramic substrate can be modified by introducing a selected second phase into a melt pool generated locally by a laser beam. CuO, WO3 powders with nano-sized particles were used to alloy alumina and a glass ceramic LTCC (Low Temperature Co-fired Ceramic). Depending on the process parameters the nano-particles were melted during the laser process and solidified during cooling in the ceramic matrix. As a result a composite with complex multiphase microstructure was developed with particle agglomerates, small crystals as well as grains covered with reaction phase, in parts with typical length scales down to the submicron range. Also the geometry of the modified area could be controlled by the process parameters. A significant change of properties could be established for the laser alloyed tracks. Especially the thermal and electrical properties were changed in comparison to that of the ceramic substrate. The developed composites showed a measurable electrical conductivity with a negative temperature coefficient for the resistivity. Therefore, the resistivity decreases with increasing temperature, which is typical for a thermally activated conduction mechanism as in semiconductors. The thermal conductivity could be increased to about 20% for CuO- and up to 70% for WO3-powder compared to the unmodified LTCC-substrate. en_US
dc.format.extent 419979 bytes
dc.format.mimetype application/pdf
dc.language.iso EN en_US
dc.publisher EDAP Editions , Grenoble, France en_US
dc.rights http://irevues.inist.fr/utilisation en_US
dc.source European Nano Systems Worshop, Paris, France, 03-04 December 2007, p. 57-62 en_US
dc.title Preparation and characterization of ceramics laser alloyed with WO3 and CuO nanopowders en_US
dc.type Conference proceeding en_US
dc.contributor.affiliation IMF I - Forschungszentrum Karlsruhe GmbH [DE] en_US
dc.contributor.affiliation IMF I - Forschungszentrum Karlsruhe GmbH [DE] en_US
dc.contributor.affiliation IMF I - Forschungszentrum Karlsruhe GmbH [DE] en_US


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