Control of the chromium‐oxygen reaction in pure iron melts | Zendy

Dimitrov Stefan | Zendy; Wenz Heike | Zendy; Koch Klaus | Zendy; Janke Dieter | Zendy

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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.

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