電気化学的方法による溶鉄・溶滓成分の相互拡散係数の測定

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Galvanic cells to determine the interdiffusivity of two components in molten iron and slag were developed, using stabilized zirconia as an electrolyte, because it had been proved that local equilibrium held throughout the cell at high temperature. After getting a thermodynamic equilibrium in the cell, the oxygen potential and/or chemical potential of slag components at the electrode was changed rapidly by changing the gas phase or supplying a constant current to the cell. Accompanied EMF change was measured as a function of time. The interdiffusivity was determined from the time dependency of the EMF. The results are as follows ; D_O_2 in 70mol% PbO-SiO_2 D_O_2=8.3exp (-26×10^3/RT)cm^2/sec 1000∿1250℃ D_O_2 in 40wt% CaO-40wt%SiO_2-20wt%Al_2O_3 D_O_2=4.5exp (-3.3×10^3/RT)cm^2/sec 1300∿1430℃ D_SiO_2-CaO in 38∿42wt% CaO-42∿38wt% SiO_2-20wt% Al_2O_3 D_SiO_2-CaO=4.5×10^3 (-78.4×10^3/RT)cm^2/sec 1340∿1460℃ D_Al_2O_3-CaO in 45∿55wt% CaO-55∿45wt% Al_2O_3 D_Al_2O_3-CaO=1.25×10^9 (-125.5×10^3/RT)cm^2/sec 1450∿1500℃ D_O in Fe D_O=(1.9±0.7)×10^<-4>cm^2/sec at 1550℃
社団法人日本鉄鋼協会の論文
1976-08-01