Synthesis and characterization of (Al-20Cu-8Si-3Sn) low temperature brazing alloy via powder metallurgy route

Abstract

The effect of the Cu, Si & Sn on the melting temperature point of the Al-based brazing filler alloy has been investigated. Amount of the elements used in the alloy taken in the following percentages 20 wt% Cu, 8 wt% Si, 3 wt% Sn and balance is Al in every 50 gm sample. The alloy has been prepared using the pure powder of all the elements using ball milling method at various milling time and fixing all other parameters as constant. XRD patterns show the various phases developed such as Al2Cu and Cu10Sn3 after the compaction & sintering. XRD & FESEM images show the variation in the particle size of Al-Cu-Si-Sn milled powder at different milling time. FESEM data has been analyzed of the Al-Cu-Si-Sn alloy both before and after sintering followed by EDX which is used to investigate the phases and to confirm the presence of the various elements in the alloy. DSC results show the melting temperature of all the samples and it has been found that there is no significant effect of the milling time on the melting temperature at same alloy composition. The melting temperature that has been achieved of Al-20Cu-8Si-3Sn is 530.4 °C.