Electrochemical Measurement of Critical Supersaturation in Fe-O--M- (M=Al, Si, and Zr)and Fe-O--Al--M__-(M=C, Mn, Cr, Si, and Ti)Melts by Solid Electrolyte Galvanic Cell

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The supersaturation ratio with respect to alumina precipitation, SAl2O3o(=(aAl2·aO3)ss/(aAl2·aO3)eq), in Fe-O-0.008∼0.090 mass%Al melt was electrochemically measured at 1873 K in an Al2O3 crucible by blowing CO2 gas or adding an Fe-2 mass%Al alloy intermittently, using plug-type ZrO2-9 mol%MgO and tube-type mullite probes. The SZrO2o(=(aZr·aO2)ss/(aZr·aO2)eq) value in Fe-O-0.04 mass%Zr melt was also measured at 1873 K in a ZrO2-11 mol%CaO crucible by adding an Fe-4 mass%Zr alloy. As a result, the critical values for log SAl2O3o and log SZrO2o were 3.5 and 1.3, respectively. No supersaturation for the precipitation of SiO2 was observed. The presence of solute element M (M=C, Mn, Cr, Si, and Ti) in an Fe-O-0.148∼0.158 mass%Al melt was found to significantly influence the supersaturation phenomenon.
社団法人日本鉄鋼協会の論文
1997-08-15