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Kinetics and Products of Molybdenum Disilicide Powder Oxidation
Author(s) -
Zhu Yuntian T.,
Shu Li,
Butt Darryl P.
Publication year - 2002
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2002.tb00124.x
Subject(s) - kinetics , molybdenum , molybdenum disilicide , amorphous solid , particle size , materials science , metal , metallurgy , chemical engineering , chemistry , crystallography , physics , quantum mechanics , engineering
In this study, we investigated the kinetics and products of the oxidation of MoSi 2 powder with an average particle size of 1.6 μm at 900°, 1000°, and 1100°C, using a small sample size of 0.5 g. Such a small sample size allowed us to minimize the effect of oxygen transportation through the powder volume, while maintaining a good relative weighing accuracy. X‐ray diffraction of oxidized samples indicated the formation of Mo 5 Si 3 and Mo metal. Analysis of the oxidation kinetics suggested that gaseous MoO 3 formed initially and amorphous SiO 2 film later. The oxidation kinetics and products observed in this study differ from those reported in an early study, in which a larger sample size was used.