Abstract
The corrosion resistance tests of Cu-Fe-O oxide melts equilibrated with Cu-Fe liquid alloys were made for various refractory materials in the temperature range 1773-1873 K. High purity magnesia showed a best corrosion resistance among the refractories tested.
Using the high purity magnesia as the crucible, the oxygen potential measurements of the two-phase equilibria between Cu-Fe-O oxide melts and Cu-Fe liquid alloys were made at 1773 K by means of a solid electrolyte galvanic cell technique. The following cell was used:
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The isothermal section of the Cu-Fe-O system at 1773 K was drawn from the oxygen potentials measured and the analysed values of the components of both phases. Alloy-oxide two phase region covered a wide area in the Cu-Fe-O phase triangle and the equilibrium oxygen partial pressure changed between 10−4 and 100 Pa in this region. Copper contents in the oxide melts in equilibrium with liquid alloys were below 2 mol% for the iron concentrations above 2.5 mol% in the Cu-Fe alloys. The solubility of oxygen in the Cu-Fe alloy showed a minimum of about 0.01 mass% at the iron concentration of around 2 mol%.
