Abstract

In order to obtain the nano size 10wt%Cu-TiO_2composite powders by mechanical alloying method for useful composite catalysis, the effects of mechanical alloying time on the formationof 10wt%Cu-TiO_2 composite powders were analyzed. The phase transformation behaviors were experimented as the heat treating temperature increased. Homogeneous 10wt% Cu-rutile type TiO_2composite powders were synthesized in 40 hours by mechanical alloying. After 60 hours mechanical alloying 50 nm size TiO_2powders were obtained. Both the phase of mechanically alloyed 10 wt% Cu-TiO_2 and pure TiO_2 powders were not transformed to anatase after annealing at the temperature range between 350 to 500 °C. The intermetallic compound of Cu_2Ti_4O was formed after 10 hours mechanical alloying, however it could be considered that this intemetallic phase dose not prevent the transformation of rutile TiO_2 to the anatase phase after heat treatment at the temperature between 350 and 550°C.

• Keywords: Mechanical alloying;TiO_2;Photocatalyst;