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Synthesis and Characterization of Fe 2 MoO 4 as a Precursor Material for Mo Alloying in Steel
Author(s) -
Chychko A.,
Teng L.,
Nzotta M.,
Seetharaman S.
Publication year - 2011
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201000158
Subject(s) - thermogravimetric analysis , molybdenum , reagent , molybdate , yield (engineering) , materials science , alloy , elemental analysis , metallurgy , characterization (materials science) , carbon fibers , chemical engineering , inorganic chemistry , chemistry , organic chemistry , nanotechnology , composite material , composite number , engineering
Iron molybdate (Fe 2 MoO 4 ) has been studied as a new potential precursor for Mo additions in high alloy steel processing. Fe 2 MoO 4 was synthesized by high temperature reactions between MoO 3 , FeO x and carbon by holding the mixture first for 23 hours at 873 K and then for 16 hours at 1373 K. The Fe 2 MoO 4 syntheses were carried out with pure reagents as well as commercial grade materials supplied by steel industry. A thermodynamic analysis of the stabilities of the various phases in the Fe‐Mo‐O‐C quaternary was carried out. The synthesis processes, leading to the Fe 2 MoO 4 formation from the precursors and further reduction by carbon were studied with the aid of thermogravimetric analysis (TGA), high‐temperature X‐ray diffraction (HT‐XRD) and evolved gas analysis by gas chromatography (GC). The maximum temperature in the case of all the experiments was 1373 K. It was found that the reactions between the precursor components start already above 873 K. The precursor mixture from commercial grade materials offers an economically advantageous process route with high Mo yield in steel.