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1 Experimental apparatus Metallothermic Reduction Components of reaction capsule Ta crucible Stainless steel foil Reaction capsule Reaction capsule Stainless steel reaction capsule Sc 2 O 3 or ScF 3 (+Al+CaCl 2 ) Ta crucible Crucible stage Stainless steel sheet Ca shot Ti sponge TIG weld Stainless steel reaction chamber Stainless steel reaction capsule containing feed material and reductant Ti sponge Stainless steel reaction chamber 1
2 Experimental condition Metallothermic Reduction Exp. Mass of sample, w i /g Excess Calculated nominal no. Collector reductant ratio composition of Feed Flux Reductant * metal R Ca Al-Sc alloy Sc 2 O 3 ScF 3 Al CaCl 2 Ca A B C Al-9mass%Sc D Al-9mass%Sc E Al-9mass%Sc F Al-6mass%Sc G Al-5mass%Sc H Al-5mass%Sc I Al-5mass%Sc J Al-5mass%Sc * Excess reductant ratio R Ca = w Ca / w theo. Ca, w Ca : Mass of reductant Ca, w theo. Ca : Stoichiometic mass of reductant Ca necessary for reduction (=0.87*w Sc2O 3, 0.22 w ScF3 ) 2
3 Result (1) Sc 2 O 3 (or ScF 3 ) + Ca Metallothermic Reduction Reduction experiment in the absence of a collector metal Exp. A: Sc 2 O 3 (0.005 mol) + Ca (0.030 mol, vapor) Obtained sample Intensity, I (a.u.) Sc CaSc 2 O 4 Sc 2 O 3 JCPDS # JCPDS # JCPDS # Angle, 2θ / degree A complex oxide (CaSc 2 O 4 ) was formed and reduction was incomplete. Exp. B: ScF 3 (0.005 mol) + Ca (0.015 mol, vapor) Obtained sample Intensity, I (a.u.) Sc CaF 2 JCPDS # JCPDS # Angle, 2θ / degree ScF 3 was successfully reduced to metallic Sc. 3
4 Phase diagram for the Al-Sc system Metallothermic Reduction Reduction experiment using a collector metal Nominal alloy composition in this study: 5 9 mass%sc in this study Experimental temperature (1273 K) Sc 2 O Al + 3 Ca 2 Al 3 Sc + 3 CaO 2 ScF Al + 3 Ca 2 Al 3 Sc + 3 CaF 2 Max. sol. 11 mass%sc at 1273 K The amount of a feed material and a collector metal were adjusted to obtain the Al alloy containing 5-9 mass%sc when the reduction was assumed to be complete. T. B. Massalski, Binary alloy phase diagrams, (Metals Park, ASM International, 1990), 162 4
5 Result (2) Sc 2 O 3 (or ScF 3 ) + Al + Ca Metallothermic Reduction Reduction experiment using a collector metal Exp. C: Sc 2 O 3 ( mol), Ca ( mol), Al (0.036 mol) Obtained Al-Sc alloy Intensity, I (a. u.) Intensity, I (a. u.) Al 3 Sc Al Al 4 Ca JCPDS # JCPDS # JCPDS # Angle, 2θ(degree) Sc 2 O 3 was successfully reduced to metallic Sc and alloyed in situ to form liquid Al-Sc alloy without forming CaSc 2 O 4. Exp. D: ScF 3 ( mol), Ca ( mol), Al (0.036 mol) Obtained Al-Sc alloy Al 3 Sc Al Al 4 Ca CaF 2 JCPDS # JCPDS # JCPDS # JCPDS # Angle, 2θ(degree) ScF 3 was successfully reduced to metallic Sc and alloyed in situ to form liquid Al-Sc alloy. 5
6 Result (3) Sc 2 O 3 + Al + Ca +CaCl 2 Metallothermic Reduction Reduction experiment using a collector metal and flux Exp. E: Sc 2 O 3 ( mol), Ca ( mol), Al (0.036 mol), CaCl 2 ( mol) Obtained Al-Sc alloy Intensity, I (a.u.) Al Al 3 Sc Al 4 Ca JCPDS # JCPDS # JCPDS # Angle, 2θ / degree Metallic phase was easily separated from slag phase. EPMA analysis (a) Aluminum (b) Scandium (c) Calcium Al 3 Sc Al 4 Ca 6
7 Result (4) Sc 2 O 3 + Al + Ca +CaCl 2 Metallothermic Reduction Reduction experiment changing amount of calcium reductant (a) R Ca = 1.5 (Exp. G) (b) R Ca = 1.25 (Exp. H) R Ca = w Ca /w Ca theo X-1 Al 4 Ca w Ca : The mass of the calcium reductant used in the experiment w theo. Ca : The stoichiometoric mass of the calcium reductant necessary for reducing all Sc 2 O 3 to metallic scandium (c) R Ca = 1 (Exp. I) (d) R Ca = 0.75 (Exp. J) It is thermodynamically difficult to completely prevent calcium accumulation in the alloy by controlling the amount of calcium reductant. 7
8 Experimental apparatus Molten salt electrolysis Molten Salt Electrolysis Anode Cathode C + x O 2- CO x + 2x e - Sc 2 O e - 2 Sc + 3 O 2- Overall reaction Sc 2 O 3 + C 2 Sc + CO x e - Sc 2 O 3 Carbon electrode (anode) CaCl 2 (-CaO) + Sc 2 O 3 molten salt Feature Ca contamination to Al-Sc alloy could be prevented by controlling a potential. Al-Sc alloy or Ag-Sc alloy (cathode) 8
9 Experimental apparatus Molten Salt Electrolysis Potential lead (Ni wire) Stainless steel tube Rubber plug Ar inlet Reaction chamber Ni reference electrode Heater CaCl 2 -Sc 2 O 3 molten salt Carbon electrode (Anode) Fe crucible Al (or Ag)-Sc alloy (Cathode) Ceramic insulator 9
10 Experimental apparatus Molten Salt Electrolysis Electrodes Assembled reaction Chamber for molten salt electrolysis Potential lead This part is installed in electric furnace 30 mm 30 mm 50 mm Electrode Crucible Electrode+Crucible 10
11 Assembled apparatus for molten salt electrolysis Molten Salt Electrolysis Water cool jacket Electric furnace Hot zone 11
12 Experimental condition Molten Salt Electrolysis Exp. # Molten salt Mass of samples, w i / g Cathode Anode Crucible Electrolysis System Y 2 O 3 Sc 2 O 3 CaCl 2 Ag Al Current, i /A Temp., T /K Time, t '/s A CaCl 2 -Y 2 O Silver Carbon Iron B CaCl 2 -Y 2 O Silver Carbon Nickel C CaCl 2 -Sc 2 O Aluminum Carbon Nickel
13 Molten Salt Electrolysis Theoretical decomposition voltage G o (kj, at 1100K) E o (V) Sc 2 O 3 + 3/2 C 2 Sc + 3/2 CO Sc 2 O C 2 Sc + 3 CO Sc 2 O 3 2 Sc + 3/2 O CaCl 2 (l ) Ca(l ) + Cl CaO + 1/2 C Ca(l ) + 1/2 CO CaO + C Ca(l ) + CO CaO Ca(l ) +1/2 O G o (at 1100K) E o (V) Y 2 O 3 + 3/2 C 2 Y + 3/2 CO Y 2 O C 2 Y + 3 CO Y 2 O 3 2 Y + 3/2 O CaCl 2 (l ) Ca(l ) + Cl CaO + 1/2 C Ca(l ) + 1/2 CO CaO + C Ca(l ) + CO CaO Ca(l ) +1/2 O
14 Exp. A (Electrolysis of CaCl 2 -Y 2 O 3 molten salt) (Anode: C, Cathode: Ag, Crucible: Fe, Current: 0.5 A, Time: 7200 s) Ag 1 mm Voltage, E / V Molten Salt Electrolysis 0.5 A, 7200 s Time, t / s Ag-Y alloy 1 mm Concentration of element i, C i (mass%) a Ag Y Fe Ca Ni After exp
15 Exp. B (Electrolysis of CaCl 2 -Y 2 O 3 molten salt) (Anode: C, Cathode: Ag, Crucible: Ni, Current: 1 A, Time: 3600 s) Before Exp. 2.0 Ag 5 mm Voltage, E / V Molten Salt Electrolysis After Exp. 1 A, 3600 s Time, t / s Ag-Y alloy 5 mm 15
16 Exp. C (Electrolysis of CaCl 2 -Sc 2 O 3 molten salt) (Anode: C, Cathode: Al, Crucible: Ni, Current: 0.5 A, Time: 1800 s) Al 5 mm Voltage, E / V Molten Salt Electrolysis 0.5 A, 3600 s Time, t / s After exp. Al-Sc alloy 5 mm 16
17 Vapor pressure Experimental temperature (1273 K) Temperature, T / K Vapor pressure, log p i / atm Ag Al Sc Y Zn Mg Ca Vapor pressure of Sc and Al is substantially smaller than that of Ca La Reciprocal temperature, 1000 T -1 / K -1 17
18 Vapor pressure Experimental temperature (1273 K) Vapor pressure, log p i / atm Mg Ca Al Sc La Y Vapor pressure of Sc and Al is substantially smaller than that of Ca Temperature, T / K I. Barin, Thermochemical data of pure substance, 3 rd edition, (Weinheim: Germany, VCH Publisher Inc., 1995) 18
19 Analytical results by XRF Metallothermic Reduction Table. Analytical results of the samples obtained after the reduction experiment. Exp. Nominal Excess Mass of Concentration of element i, C i (mass%) b no. composition of reductant flux Al-Sc alloy a ratio, R Ca a w flux/g Al Sc Ca Si Fe Ta C Al-9mass%Sc < < 0.01 D Al-9mass%Sc < E Al-9mass%Sc < F Al-6mass%Sc < G Al-5mass%Sc H Al-5mass%Sc I Al-5mass%Sc < J Al-5mass%Sc < a Excess reductant ratio R Ca = w Ca / w Ca theo., w Ca : Mass of reductant Ca, w Ca theo. : Stoichiometic mass of reductant Ca necessary for reduction (=0.87w Sc2O 3 or 0.22w ScF3 ) b Determined by X-ray fluorescence analysis. 19
20 Phase diagram for the Al-Ca system Experimental temperature (1273 K) T. B. Massalski, Binary alloy phase diagrams, (Metals Park, ASM International, 1990), 98 20
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