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Silver content effect on rheological and electrical properties of silver pastes

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Abstract

The novelty of this work is laboratory formulation of environmentally friendly, water-based silver inks adapted for screen printing. The challenge was also to elaborate inks that can withstand temperatures as high as 900 °C. Indeed, when printed on ceramic substrate, they were sintered at these high temperatures. These inks can replace conductive silver pastes present in the market, today, and containing irritant solvents such as terpineol and other aromatic solvents. Besides, screen printing is considered as an additive technique, thus allowing reducing wastes. Furthermore, only with 72.5% silver, considered as low content compared to commercial inks (≥75%), prepared inks presented good electrical resistivity, 23 nΩ m, close to that of bulk silver resistivity, 16 nΩ m. Formulation of silver inks with spherical particles, 2–3 μm mean diameter, was performed. The aim of the study was to determine silver content effect on pastes rheological behaviour, lines properties (width, thickness and roughness) and electrical properties. Therefore, rheological behaviour of inks was studied; in particular, Casson and Bingham models were applied in order to determine the yield stress. Viscosity evolution as a function of shear rate was also determined. Besides, the thixotropic behaviour of inks was highlighted. Inks were then screen printed on alumina sintered substrates and cured at different temperatures during 15 min. Topography measurements were performed. Line resistivity as small as 35 nΩ m was measured on cured lines. These inks, printed on ceramic tapes, can be used to print microwave transmission lines, for which resistivities lower than 1 mΩ m are requested.

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Acknowledgments

We would like to thank the European Union for financial support through the MULTILAYER project (FP7-NMP4-2007-214122), B. Khelifi form Grenoble INP—Pagora for performing the SEM images and J. Stiernstedt from Swerea IVF for providing us by LTCC tapes.

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Authors and Affiliations

  1. Laboratory of Pulp and Paper Science and Graphic Arts, LGP2 UMR 5518, Saint-Martin-d’Hères, France

    Rita Faddoul, Nadège Reverdy-Bruas & Joséphine Bourel

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  1. Rita Faddoul
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  2. Nadège Reverdy-Bruas
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  3. Joséphine Bourel
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Correspondence to Rita Faddoul.

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Faddoul, R., Reverdy-Bruas, N. & Bourel, J. Silver content effect on rheological and electrical properties of silver pastes. J Mater Sci: Mater Electron 23, 1415–1426 (2012). https://doi.org/10.1007/s10854-011-0607-3

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  • DOI: https://doi.org/10.1007/s10854-011-0607-3

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