A method for joining materials together by a diffusion...

C - Chemistry – Metallurgy – 22 – C

Patent

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C22C 5/08 (2006.01) B23K 20/233 (2006.01) B23K 35/00 (2006.01) C22C 5/06 (2006.01)

Patent

CA 2176919

A method of joining two elements using a silver based alloy having a germanium content, which method comprises the steps of: providing two elements to be joined together, at least one of the elements comprising a silver based alloy having a germanium content; placing the two elements adjacent one another such that a portion of a free surface of the silver based alloy contacts a portion of a free surface of the other element without interposing a filler material between the two free surfaces; and heating the two free surfaces where the two elements are adjacent one another to a temperature below that of the melting temperatures of any of the constituent materials of the elements thereby joining the two elements by a diffusion process. A silver/germanium alloy suitable for use in the method has a silver content of at least 92.5 % by weight and a germanium content of between 0.4 and 7 % by weight, which alloy contains boron as a grain refiner at a concentration of less than 20 parts per million.

Procédé de soudure de deux éléments au moyen d'un alliage à base d'argent possédant une teneur en germanium. Ledit procédé comprend les étapes suivantes: mise en présence de deux éléments à souder, dont au moins un comprend un alliage à base d'argent possédant une teneur en germanium; positionnement contigu des deux éléments, de telle manière qu'une partie d'une surface libre de l'alliage à base d'argent vienne en contact avec une partie d'une surface libre de l'autre élément sans interposition d'un matériau de charge entre les deux surfaces libres; chauffage desdites surfaces à l'emplacement où les deux éléments sont contigus l'un à l'autre à une température inférieure à celle des températures de fusion de tout matériau constituant lesdits éléments, ce qui permet de les souder par diffusion. L'alliage d'argent/germanium s'utilisant dans le procédé possède une teneur en argent d'au moins 92,5 % en poids et une teneur en germanium comprise entre 0,4 et 7 % en poids, ledit alliage contenant du bore en tant que constituant d'affinage de grain en une concentration inférieure à 20 parties par million.

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