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A Novel Brazing Technique for Aluminum and Other Metals

Published online by Cambridge University Press:  15 February 2011

Roland S. Timsit  and
B. J. Janeway
Roland S. Timsit
Affiliation:
Alcan International Ltd., Kingston R&D Centre, Kingston, ON, Canada K7L 5L9
B. J. Janeway
Affiliation:
Alcan International Ltd., Kingston R&D Centre, Kingston, ON, Canada K7L 5L9
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Abstract

In the novel brazing technique, the aluminum components in the joint assembly are coated with a powder mix consisting of elemental Si and a potassium fluoroaluminate flux. During brazing at −600°C in nitrogen gas, the flux melts and removes the native Al2O3 surface film from the coated aluminum components. This action allows the silicon to diffuse into the aluminum to generate in-situ a layer of Al-Si filler metal of eutectic composition.The liquid metal then flows into thejoint and yields a metallurgical bond on cooling.

This brazing technique maybe exploited with aluminum using intermediary elements other than Si. The technique may also be used for joining other metals.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 314: Symposium R – Joining and Adhesion of Advanced Inorganic Materials , 1993 , 215
Copyright
Copyright © Materials Research Society 1993

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