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Liquid‐Phase Reaction‐Bonding of Silicon Carbide Using Alloyed Silicon‐Molybdenum Melts
Author(s) -
Messner Robert P.,
Chiang YetMing
Publication year - 1990
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.1151-2916.1990.tb05179.x
Subject(s) - silicon , materials science , silicide , silicon carbide , molybdenum , metallurgy , refractory metals , carbide , composite material , phase (matter) , chemical engineering , chemistry , organic chemistry , engineering
We have investigated reaction‐forming of silicon carbide by the infiltration of carbonaceous preforms using alloyed silicon melts, in order to synthesize composite materials free of the residual silicon phase that has previously limited mechanical properties and upper use temperatures. In this approach, rejection of the alloying component(s) from the primary silicon carbide phase into the remaining melt results in the formation of a secondary refractory phase, such as a silicide, in place of residual free silicon. Experiments conducted in the Si‐Mo melt system show that relatively dense (>90%) silicon carbide‐molybdenum silicide materials free of residual silicon and residual carbon can be obtained. A model for reactive infiltration based on time‐dependent permeabilities is proposed. Processing variables important for control of the reaction rate relative to the infiltration rate, and associated processing flaws, are discussed.