Investigation on the wear behavior of Cu/TiO2 Nano-composites Produced by Powder Metallurgy and internal oxidation

Electrical contacts should have good thermal and electrical conductivity and certain strength. The copper base nano-composites reinforced with fine TiO2 particles have almost identical electrical and thermal conductivity with copper; in addition, because of the dispersion of the fine TiO2 particles, Cu/TiO2 composite has more strength than pure Cu, which improves copper matrix strength through impeding dislocation movement. In this work, first Cu and Ti powders were mechanically alloyed for 60h under Argon atmosphere and then Cu2O powders were added as oxidant. The specimens, containing different amounts of TiO2 were produced by in-situ oxidation of Cu-Ti pre-alloyed powders. For compaction, at the first step powders pressed under 30MPa pressure at 400°C and then pressed at 400MPa in room temperature. The compact was then sintered at 800°C for 1h under argon atmosphere. Physical and mechanical properties such as density, specific electrical resistivity and hardness of the products were altered with amount of TiO2 in Cu matrix. Microstructure and composition of the specimens were studied before and after internal oxidation using SEM equipped with EDS analyzer.

کلیدواژه ها:

Copper base nanocomposite ، TiO2 particles ، internal oxidation ، wear rate ، pin on disk