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Vacuum Diffusion Brazing of Al5052 Alloys Using Ag-28Cu Insert Metal

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Abstract:

In this study, we examined brazeability of Al5052 alloys using a Ag-28Cu insert metal in vacuum condition. A high frequency induction-heating vacuum hot press was used for the brazing. Under a static pressure of 0.5 MPa and a vacuum of 5×10-5 Torr, the temperature of hot press was raised up to brazing temperature (480-590°C) at a speed of 10°C/min and held at the brazing temperature for various times. Interface behaviors of the brazed joints were observed after brazing at 480-590°C by optical microscopy and Electron Probe Micro Analyzer (EPMA). Also, bonding strength of the brazed joints was examined. During vacuum brazing of Al5052 alloys with Ag-28Cu insert metal, eutectic melts were formed by eutectic reaction between Al5052 and Ag-28Cu insert metal at about 490°C. It was found that reaction layers of two phases are formed at the interface between Al5052 and Ag-28Cu insert. EPMA analysis revealed that two phases in the reaction layers consist of Ag-rich phase and Cu-rich phase. The bonding strength of the joints increased with brazing temperature and time. The highest bonding strength was 141 MPa at 580°C, 10min.

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Periodical:

Materials Science Forum (Volumes 510-511)

Pages:

390-393

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.510-511.390

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Online since:

March 2006

Authors:

Young Sup Lee, Kyoung Won Seo, C.H. Lee, Cheol Ho Lim, C.H. Lee

Keywords:

AA 5052 Aluminium Alloy, Ag-28Cu, Brazing, Diffusion, Insert Metal

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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