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Diffusion soldering using a Gallium metallic paste as solder alloy: study of the phase formation systematics

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Abstract

In this work preliminary results are reported on the characterization of Pb-free joints produced by using a diffusion soldering method at a process temperature of 700 °C during 20 min. The solder alloy is a metallic paste involving Ga and Al and Ni powder, and the substrates are Cu and Ni. The dissolution and diffusion-reaction processes, which take place at the interfaces of the interconnection zone, have been investigated by means of SEM and EPMA. A solid solution and intermetallic compounds (IMCs) with high melting point form as layers almost free from defect, allowing service temperatures about 500 °C higher than the process temperature. The phase stability sequence starting from the Ni to the Cu interface is the following: α′-Ni3Ga, γ-Cu9Ga4, β-Cu3Ga and (Cu) solid solution of the Ga–Cu system. The relative reaction front displacement of the layers and the implications of the present findings for the applicability of the diffusion-soldering method are also discussed.

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Acknowledgements

This research was partially supported by the National Scientific and Research Council of Argentina (CONICET) through the PIP 02612 and Res. No. 1273/04 grants.

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Authors and Affiliations

  1. Facultad de Ingeniería, Universidad Nacional del Comahue/CONICET, Buenos Aires 1400, 8300, Neuquen, Argentina

    Silvana Sommadossi

  2. Centro Atómico Bariloche, Comisión Nacional de Energía Atómica/CONICET, Bustillo 9500, R8402AGP, San Carlos de Bariloche, Argentina

    Horacio E. Troiani & Armando Fernández Guillermet

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  1. Silvana Sommadossi
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  2. Horacio E. Troiani
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  3. Armando Fernández Guillermet
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Correspondence to Silvana Sommadossi.

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Sommadossi, S., Troiani, H.E. & Fernández Guillermet, A. Diffusion soldering using a Gallium metallic paste as solder alloy: study of the phase formation systematics. J Mater Sci 42, 9707–9712 (2007). https://doi.org/10.1007/s10853-007-1940-z

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  • DOI: https://doi.org/10.1007/s10853-007-1940-z

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