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Oxygen activities in Cr‐containing Fe and Ni‐based melts
Author(s) -
Heinz Michael,
Koch Klaus,
Janke Dieter
Publication year - 1989
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.198901646
Subject(s) - chromium , oxygen , nickel , oxide , chemistry , metal , nickel oxide , inorganic chemistry , phase (matter) , nuclear chemistry , metallurgy , materials science , organic chemistry
Plug‐type, ZrO 2 ‐based oxygen sensors have been used for long‐term measurements of oxygen activity in Fe–O–Cr and Ni–O–Cr melts. In these melts, equilibrated with chromium oxide, oxygen activities a O were determined as a function of Cr content. From the experimental results, data were derived for activity coefficients f O and of 1st and 2nd order interaction parameters e O Cr and r O Cr . Cr 2 O 3 has been identified as the oxide phase in equilibrium with the metal melt at ≥ 5 wt.% Cr in the case of iron and at ≥ 0.2 wt.% Cr in the case of nickel. Oxygen activities and oxygen contents in Cr‐containing iron melts are lowered with increasing additions of nickel. Further investigations were directed to a O determination in Fe–O–Cr–C and Fe–O–Cr–Al melts.