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Chemical Reactions in the Processing of Mosi2 + Carbon CompactsHot-pressing of MoSi2 powders with carbon at high temperatures reduces the siliceous grain boundary phase in the resultant compact. The chemical reactions in this process were examined using the Knudsen cell technique. A 2.3 wt pct oxygen MoSi2 powder and a 0.59 wt pct oxygen MoSi2 powder, both with additions of 2 wt pct carbon, were examined. The reduction of the siliceous grain boundary phase was examined at 1350 K and the resultant P(SiO)/P(CO) ratios interpreted in terms of the SiO(g) and CO(g) isobars on the Si-C-O predominance diagram. The MoSi2 + carbon mixtures were then heated at the hot-pressing temperature of 2100 K. Large weight losses were observed and could be correlated with the formation of a low-melting eutectic and the formation and vaporization of SiC.
Document ID
19930069736
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Jacobson, Nathan S.
(NASA Lewis Research Center Cleveland, OH, United States)
Lee, Kang N.
(NASA Lewis Research Center Cleveland, OH, United States)
Maloy, Stuart A.
(NASA Lewis Research Center Cleveland, OH, United States)
Heuer, Arthur H.
(Case Western Reserve Univ. Cleveland, OH, United States)
Date Acquired
August 16, 2013
Publication Date
August 1, 1993
Publication Information
Publication: American Ceramic Society, Communications
Volume: 76
Issue: 8
ISSN: 0002-7820
Subject Category
Inorganic And Physical Chemistry
Report/Patent Number
E-7200
Accession Number
93A53733
Funding Number(s)
CONTRACT_GRANT: N00014-86-K-0773
Distribution Limits
Public
Copyright
Other

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