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Paralinear Oxidation of CVD SiC in Simulated Fuel‐Rich Combustion
Author(s) -
Fox Dennis S.,
Opila Elizabeth J.,
Hann Raiford E.
Publication year - 2000
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.1151-2916.2000.tb01461.x
Subject(s) - thermogravimetric analysis , volatilisation , kinetics , combustion , quartz , materials science , analytical chemistry (journal) , partial pressure , chemistry , mineralogy , chemical engineering , metallurgy , oxygen , organic chemistry , physics , quantum mechanics , engineering
The oxidation kinetics of CVD SiC were measured by thermogravimetric analysis (TGA) in a 4H 2 ·12H 2 O·10CO·7CO 2 ·67N 2 gas mixture flowing at 0.44 cm/s at temperatures between 1300° and 1450°C in fused quartz furnace tubes at 1 atm total pressure. The SiC was oxidized to form solid SiO 2 . At ≥1350°C, the SiO 2 was in turn volatilized. Volatilization kinetics were consistent with the thermodynamic predictions based on SiO formation. These two simultaneous reactions resulted in overall paralinear kinetics. A curve fitting technique was used to determine the linear and parabolic rate constants from the paralinear kinetic data. Volatilization of the protective SiO 2 scale resulted in accelerated consumption of SiC. Recession rates under conditions more representative of actual combustors were estimated from the furnace data.