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SiC and Si3N4 Recession Due to SiO2 Scale Volatility Under Combustor ConditionsSilicon carbide (SiC) and Si3N4 materials were tested in various turbine engine combustion environments chosen to represent either conventional fuel-lean or fuel-rich mixtures proposed for high-speed aircraft. Representative chemical vapor-deposited (CVD), sintered, and composite materials were evaluated by furnace and high-pressure burner rig exposures. Although protective SiO2 scales formed in all cases, the evidence presented supports a model based on paralinear growth kinetics (i.e., parabolic growth moderated simultaneously by linear volatilization). The volatility rate is dependent on temperature, moisture content, system pressure, and gas velocity. The burner tests were thus used to map SiO2 volatility (and SiC recession) over a range of temperatures, pressures, and velocities. The functional dependency of material recession (volatility) that emerged followed the form A[exp(-Q / RT)](P(sup x)v(sup y). These empirical relations were compared with rates predicted from the thermodynamics of volatile SiO and SiOxHy reaction products and a kinetic model of diffusion through a moving boundary layer. For typical combustion conditions, recession of 0.2 to 2 micrometers/hr is predicted at 1200 to 1400 C, far in excess of acceptable long-term limits.
Document ID
Document Type
Technical Publication (TP)
Smialek, James L.
(NASA Glenn Research Center Cleveland, OH United States)
Robinson, Raymond C.
(DYNACS Engineering Co., Inc. Brook Park, OH United States)
Opila, Elizabeth J.
(Cleveland State Univ. Cleveland, OH United States)
Fox, Dennis S.
(NASA Glenn Research Center Cleveland, OH United States)
Jacobson, Nathan S.
(NASA Glenn Research Center Cleveland, OH United States)
Date Acquired
September 6, 2013
Publication Date
July 1, 1999
Subject Category
Nonmetallic Materials
Report/Patent Number
NAS 1.60:208696
Funding Number(s)
PROJECT: RTOP 537-04-23
Distribution Limits
Work of the US Gov. Public Use Permitted.
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