In situ reaction mechanism of Cu–Ti–CuO system in pure copper melts

Abstract

In situ reaction was carried out using Cu–Ti–CuO as reaction system and pure copper melt as reaction medium. When the melt temperature is close to the melting point of pure copper, the sample was obtained by casting near the melting point. The effects of reaction parameters, such as the molar ratio of reactants and melt preheating temperature, on the in situ reaction mechanism, as well as the effects of the size, shape and distribution of the reaction products on the near melting point casting structure of the matrix copper were studied, so as to prepare Cu-TiO _2 composites with good electrical and mechanical properties. The results show that Cu–Ti–CuO reaction system can produce rutile titanium dioxide particles smaller than 2 μ m of pure copper melt, without Ti _X Cu _Y intermetallic compound, with the molar ratio of Ti to CuO of 1:2, the content of diluent of 50%, the forming pressure of 10 MPa, and the preheating temperature of pure copper melt of 1250 °C. The morphology of TiO _2 particles is nearly spherical and dispersed in the copper matrix. The reasons for the formation of TiO _2 particles in Cu–Ti–CuO reaction system were analyzed from the perspectives of thermodynamics, kinetics and Redox reaction. When the mass fraction of TiO _2 is 3%, the solidification structure of the sample is more uniform than that of pure copper, the grains are refined, and the average grain size is 103.29 μ m.

Keywords

• Cu–Ti–CuO system
• pure copper
• in situ reaction
• TiO2 particles
• casting near melting point
• mechanism study