| Autor: |
Lee, Young Sup, Seo, Kyoung Won, Lee, C.H., Lim, Cheol Ho, Lee, C.H. |
| Zdroj: |
Materials Science Forum; March 2006, Vol. 510 Issue: 1 p390-393, 4p |
| Abstrakt: |
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℃) at a speed of 10℃/min and held at the brazing temperature for various times. Interface behaviors of the brazed joints were observed after brazing at 480-590℃ 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℃. 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℃, 10min. |
| Databáze: |
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