Research on Copper/Aluminum Bimetallic Solid-Liquid Compound Process
The copper/aluminum composite material was prepared by the impact jet solid-liquid compound method,and the surface of the copper matrix was pretreated in advance,and the moving speed of the copper matrix was changed during the casting process,so that the heat exchange between the molten aluminum and the steel matrix was strengthened to varying degrees.The composition and microstructure of the copper/aluminum composite layer were analyzed by SEM,XRD and EDS,the bonding strength was measured by a universal testing machine,and the hardness distribution of the composite layer was analyzed by microhardness test.The experimental results showed that when the pouring temperature was 720℃,the heat transfer of the molten aluminum to the copper matrix decreased with the increase of the moving speed of the copper matrix,and the composite layer was composed of Cu/Al intermetallic compounds.The nickel plating layer made the molten aluminum produce wetting,diffuse flow and protection on the surface of the copper matrix,promote the metallurgical bond formed at the solid-liquid interface,and effectively improved the bonding strength of the copper/aluminum composites.When the pouring temperature of the sample was 720℃and the moving speed of the copper matrix was 15 mm/s,the measured interfacial bonding strength was 24.8 MPa.
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