La0.5Sr0.5CoO3-δ (LSCO) powder was synthesized by sol-gel method and subsequently modified with Cu powder via high-energy ball milling process, and from Cu-modified Ag/LSCO powder a series of electrical contact materials including sheets and wires were prepared by powder metallurgy process combined with hot extrusion technique. The influence of Cu content on the interfacial wettability, physical and mechanical properties of Ag/LSCO materials was explored. The results showed that with the increase of Cu content, the resistivity of the modified Ag/LSCO-xCu (x=0, 1, 2, 4, 6, 8) material presented a rising-declining change, consistent with trend in wetting angle changes between Ag and LSCO substrates. But for the change of density and hardness of Ag/LSCO-xCu, an opposite trend was observed. With a content of Cu at 4%, the wetting angle between Ag and LSCO-4Cu substrate reached a minimum value of 55.0°, and the modified Ag/LSCO wire (φ2.35 mm) displayed the best performance with the resistivity, hardness and density being 2.29 μΩ.cm, 946.7 MPa and 9.73 g/cm3, respectively. Moreover, its corresponding break elongation reached up to 3.9%, 3.9 times that of pure Ag/LSCO wire. |