기계적 합금화법으로 제조된 Cu/TiO2 촉매용 분말의 상변화 특성

Abstract

In order to obtain the nano size 10wt%Cu-TiO2 composite powders by mechanical alloying method for useful composite catalysis, the effects of mechanical alloying time on the formation of 10wt%Cu-TiO2 composite powders were analyzed. The phase transformation behaviors were experimented as the heat treating temperature increased. Homogeneous 10wt%Cu-rutile type TiO2 composite powders were synthesized in 40 hours by mechanical alloying. After 60 hours mechanical alloying, 50 ㎚ size TiO2 powders were obtained. Both the phase of mechanically alloyed 10wt%Cu-TiO2 and pure TiO2 powders were not transformed to anatase after annealing at the temperature range between 350 to 500℃. The intermetallic compound of Cu2Ti4O was formed after 10 hours mechanical alloying, however it could be considered that this intermetallic phase dose not prevent the transformation fo rutile TiO2 to the anatase phase after heat treatment at the temperature betwen 350 and 550℃.