Effect of Contact Surface Shape between Solid Cu and Molten Al to Synthesized Compound Phase ―In Order to Analyze Combustion Synthesis of Cu/Al Premixed Compact―

Abstract

In order to analyze combustion synthesis of Cu-Al intermetallic compounds, Cu/Al premixed compacts were quenched during combustion synthesis, and the micro-structure was analyzed. And, in dipping experiments of Cu wire and Cu plate into molten Al, the formation reactions between solid Cu and molten Al were also investigated. A piece of Cu wire was put into a crucible, and Al powder was filled around the Cu wire. The crucible was inserted in a quartz tube, and was vacuum-sealed with 10-3Pa vacuum degree. The capsule was kept at 800-1000°C for 0-90 min. using an electric furnace. After the holding time, the cross-sections were observed by an optical microscope and SEM-EDX. Additionally, the dipping experiment of Cu plates into molten Al were also investigated by same method as Cu wire experiment. From the quenching of Cu/Al premixed compacts during the combustion synthesis, Cu3Al formation reaction between Cu particles and molten Al could be observed. The formation reaction was also found in the dipping experiments of Cu wire and Cu plate into molten Al. However, the formation rate and the composition of Cu3Al synthesized was depend on the contact surface shape between Solid Cu and molten Al. Furthermore, kinetics equations were derived for the Cu3Al formation reaction. [doi:10.2320/jinstmet.J2017004]