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Control of the aluminium‐oxygen reaction in pure iron melts
Author(s) -
Dimitrov Stefan,
Weyl Axel,
Janke Dieter
Publication year - 1995
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199501762
Subject(s) - chemistry , aluminium , oxygen , electrochemistry , slag (welding) , aluminium oxide , nuclear chemistry , metallurgy , materials science , electrode , organic chemistry
Modified electrochemical oxygen sensors based on CaO‐doped ZrO 2 and Y 2 O 3 ‐doped ThO 2 were developed and applied to study the aluminium‐oxygen reaction in pure liquid iron with special regard to the provision of reliable experimental conditions and the attainment of true chemical equilibrium. The sensors represent valuable tools particularly for EMF long‐term measurements over several hours. At 1600 °C, values of the constant and of the interaction parameters and were determined. When Fe‐O‐Al melts are covered with a slag phase at an activity a (Al 2 O 3 ) < 1, e.g., CaO‐saturated CaO‐Al 2 O 3 slag, the Al‐O relationship in the iron may nevertheless be controlled by an equilibrium oxide phase at an activity a (Al 2 O 3 ) = 1, presumably represented by inclusion particles consisting of pure Al 2 O 3 .