Synthesis of Fine Mo2C Powder from Prereduced Mo in Undiluted CH4 Flow

The carburization behavior of prereduced Mo was investigated in undiluted CH 4 flow at 900–1000 K. Prior to the experiments, equilibrium thermodynamic analysis was carried out in the Mo-C-H system. The products were characterized by mass measurement, x-ray diffraction and scanning electron microscop...

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Bibliographic Details
Published in:JOM (1989) 2017-10, Vol.69 (10), p.1997-2002
Main Authors: Cetinkaya, S., Eroglu, S.
Format: Article
Language:English
Subjects:
Chemistry/Food Science
Earth Sciences
Engineering
Environment
Physics
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Summary:The carburization behavior of prereduced Mo was investigated in undiluted CH 4 flow at 900–1000 K. Prior to the experiments, equilibrium thermodynamic analysis was carried out in the Mo-C-H system. The products were characterized by mass measurement, x-ray diffraction and scanning electron microscopy techniques. A single Mo 2 C phase was obtained within ~45 min, ~5 min, and ~2.5 min at 900 K, 950 K, and 1000 K, respectively, at CH 4 contents higher than the predicted ones. The reasons for this behavior were discussed in terms of CH 4 stability, open tube flow, and self-created atmosphere in the powder bed. The fractional conversion-time curves indicated that the carburization kinetics followed a linear rate law. The Mo 2 C crystallite size (26–37 nm) and platelet thickness (50–100 nm) were found to be smaller than those of the parent Mo phase. These findings were attributable to the defects formed as a result of stresses associated with the reduction and the carburization.
ISSN:1047-4838
1543-1851
DOI:10.1007/s11837-017-2326-6