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A novel brazing technique for aluminum and other metals

Published online by Cambridge University Press:  03 March 2011

R.S. Timsit  and
B.J. Janeway
R.S. Timsit
Affiliation:
Alcan International Ltd., Kingston R&D Centre, P.O. Box 8400, Kingston, Ontario, Canada K7L 5L9
B.J. Janeway
Affiliation:
Alcan International Ltd., Kingston R&D Centre, P.O. Box 8400, Kingston, Ontario, Canada K7L 5L9
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Abstract

In this brazing technique, at least one of the metal surfaces to be joined is coated with a powder-mixture of silicon and a potassium fluoroaluminate flux. Brazing of aluminum is carried out by heating at ∼600 °C in nitrogen gas. During heating, the flux melts and dissolves the oxide layers on the contacting surfaces, thus allowing the silicon to come into intimate contact with bare aluminum. At a temperature exceeding the Al–Si eutectic temperature of 577 °C, the silicon diffuses rapidly into the aluminum and generates in situ a layer of Al–Si liquid alloy of near-eutectic composition. The filler material then flows into the joint and forms a fillet. This brazing technique may be exploited with aluminum using intermediary elements other than Si, and may be used for joining a variety of metals.

Type
Rapid Communications
Information
Journal of Materials Research , Volume 8 , Issue 11 , November 1993 , pp. 2749 - 2752
Copyright
Copyright © Materials Research Society 1993

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References

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