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Control of the chromium‐oxygen reaction in pure iron melts
Author(s) -
Dimitrov Stefan,
Wenz Heike,
Koch Klaus,
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.199501085
Subject(s) - chromium , chemistry , analytical chemistry (journal) , atmospheric temperature range , thermodynamics , nuclear chemistry , metallurgy , materials science , physics , chromatography , organic chemistry
Oxygen activities in Fe‐O‐Cr melts, equilibrated with chromium oxide, were determined as a function of chromium content by EMF measurements using ZrO 2 (CaO) plug‐type sensors with a Cr‐Cr 2 O 3 reference. Plug‐type sensors with or without Cr 2 O 3 saturator were used in the experiments. From the experimental results values for the activity coefficient f O and the interaction parameters and were evaluated. Raoultian chromium activity features a slight positive deviation from ideal solution behaviour in the temperature range from 1550 to 1650°C. Taking into account the calculated interaction parameters, the equilibrium constant K Cr‐O was redetermined at 1550 to 1650°C. In comparison with previous studies a better agreement was obtained with existing thermochemical data.