PREPARING ALUMINIUM-SCANDIUM INTER-ALLOYS DURING REDUCTION PROCESS IN KFALF_3-SC_2O_3 MELTS

摘要

Al-Sc Alloys have attracted much attention in recent years due torntheir great potential in many advanced applications. In this work,rnAl-Sc alloys were prepared on liquid Al cathode in KF-AlF_3-rnSc_2O_3 (CR=1.22) melts during reduction process. Scanningrnelectron microscope (SEM) and Inductively coupled plasmarnatomic emission spectroscopy (ICP-AES) showed that the primaryrnAl3Sc were highly faceted and Sc contents were 0.44 and 0.73rnwt.% in the alloys produced at 750 ℃ with current density of 0.5rnand 1.0 A/cm~2, respectively. At 1.0 A/cm~2, Sc content increased torn0.95 wt.% at 800 ℃ and 1.27 wt.% at 850 ℃. But higher massrnloss from the melts was found with increased operatingrntemperatures. Cyclic Voltammetry and Linear SweeprnVoltammetry studies demonstrate that the reduction of Sc~(3+) occursrnat liquid Al cathode and Al_3Sc formation is electrochemicallyrnirreversible. In addition, the effect of ultrasound on the Scrndistribution was also investigated.