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Chemical Reactions in the Processing of MoSi2 Carbon Compacts
Author(s) -
Jacobson Nathan S.,
Lee Kang N.,
Maloy Stuart A.,
Heuer Arthur H.
Publication year - 1993
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.1151-2916.1993.tb08324.x
Subject(s) - eutectic system , carbon fibers , materials science , vaporization , grain boundary , oxygen , hot pressing , phase (matter) , sintering , chemical engineering , metallurgy , mineralogy , microstructure , chemistry , composite material , organic chemistry , composite number , engineering
Hot‐pressing of MoSi 2 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% oxygen MoSi 2 powder and a 0.59 wt% oxygen MoSi 2 powder, both with additions of 2 wt% carbon, were examined. The reduction of the siliceous grain boundary phase was examined at 1350 K and the resultant P(SiO)/P(CO) rations interpreted in terms of the SiO (g) and CO (g) isobars on the Si‐C‐O predominance diagram. The MoSi 2 + carbon mixtures were then heated at the hot‐pressing temperature of 2100 K. Large weigh losses were observed and could be correlated with the formation of a low‐melting eutectic and the formation and vaporization of SiC.