MICROSTRUCTURE AND HYDROGEN-REDUCTION BEHAVIOR OF HIGH ENERGY BALL MILLED CuO-SnO2 POWDER MIXTURE

초록

The CuO and SnO2 powders with the mean powder size of approximately 2 mm were mixed and ball-milled at a rotation rate of 800 rpm for 5 h, their microstructure and reduction characteristics were investigated. The mixed powder size became smaller to approximately 0.7 mm after milling, which consisted of the nano-sized particles with approximately 45 nm in diameter. In the milled mixture, there existed the CuO and SnO2 phases. The reduction reactions of CuO and SnO2 powders occurred at about 250 and 545 degrees C respectively. However, as-milled CuO-SnO2 powder mixture showed three reduction reactions at around 250, 500, and 545 degrees C, which related to the reactions of CuO -> Cu, SnO2 -> SnO and SnO -> Sn, respectively.