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Measurement of aluminum or silicon activity in Fe‐Ni (< 30 %) alloys using mullite and ZrO 2 ‐based solid electrolyte galvanic cell
Author(s) -
Li Guangqiang,
Inoue Ryo,
Suito Hideaki
Publication year - 1996
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199605532
Subject(s) - mullite , crucible (geodemography) , oxygen , galvanic cell , aluminium , electrolyte , silicon , metallurgy , chemistry , analytical chemistry (journal) , materials science , nuclear chemistry , electrode , chromatography , computational chemistry , organic chemistry , ceramic
Using mullite (3Al 2 O 3 ·2SiO 2 )‐tube type and ZrO 2 (MgO mole fractions of 9 %)‐plug type solid electrolyte, the activities of Al in the Fe‐15, 29% Ni‐0.002 to 0.84% Al (mass contents in%) alloys were measured at 1873 K in an Al 2 O 3 crucible, and those of Si in the Fe‐13, 28% Ni‐0.13 to 2.3% Si alloys were measured at 1823 K in a mullite crucible with an excess of SiO 2 . The interaction coefficients of and were determined as −0.0173 ± 0.0052 and 0.00021 ± 0.00007, respectively, and those of and were determined as 0.0094 ± 0.0049 and −0.00008 ± 0.00004, respectively. The oxygen activities obtained by the EMF measurements were compared with those obtained from the contents of analyzed oxygen. The oxygen activities in the Fe‐Ni‐ Al alloys were found to be supersaturated. The interaction coefficients of and were determined as 0.0027 ± 0.0012 and 0.00012 ± 0.00004, respectively, from the contents of analyzed oxygen in Fe‐Ni‐ Si alloys.