Gallium Distribution in Gallium-Coated Aluminum for Brazing Application

E. Ferchaud; Frédéric Christien; Pascal Paillard; V. Barnier; Krzysztof Wolski; H. Mourton; P. Azaïs; C. Rossignol

doi:10.4028/www.scientific.net/DDF.309-310.255

Paper Titles

Diffusion Controlled Grain Triple Junctions Wetting in Metals
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Diffusion Spreading of the Emitted Metallurgical Gas
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Critical Embrittlement Temperature for Tube Steels Used at Atomic Power Stations
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Fabrication and Microstructure of Al-Based Hybrid Composite Reinforced by B₄C and Ultra-Dispersed Tungsten
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Gallium Distribution in Gallium-Coated Aluminum for Brazing Application
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Thermodynamic and Kinetic Study of Leaching Magnesia from Natural Magnesites by Carbon Dioxide
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The Liquid Bismuth Penetration from Solid Bi₂Te₃: Grain Boundary Embrittlement and Effect of Impurities
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Low-Temperature Synthesis of Perovskites PbTiO₃ and PbZrO₃
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Thermodynamically Consistent Formulation of the Sedimentation in Solids and Liquids
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Gallium Distribution in Gallium-Coated Aluminum for Brazing Application

Abstract:

This work deals with the study of a new aluminum brazing process, called Galluminium. This technique, consisting in using gallium as a solder, is advantageous since it enables to braze at ambient air without flux. Indeed if the gallium coating is done mechanically, it descales the alumina layer and acts as a barrier against further reoxidation. Nevertheless, liquid gallium causes a severe aluminum embrittlement since it penetrates into the aluminum grain boundaries. We will show in this paper that this phenomenon has only a little impact on the mechanical resistance of the brazed joints since the amount of deposited gallium is enough low to avoid a severe embrittlement and the heat treatment (from 200°C to 600°C during several minutes) during brazing process dissolves gallium in the bulk.