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Adherent crystalline mullite coatings have been chemically vapor deposited on SiC and Si3N4-based substrates to enhance its corrosion/ oxidation resistance. Thermodynamic and kinetic considerations have been utilized to produce mullite coatings with a variety of growth rates, compositions, and morphologies. The flexibility of processing can be exploited to produce coated ceramics with properties tailored to specific applications and varied corrosive environments. The coating and been tested in several corrosive environments including oxidation, jet burner exhaust, and Na2SO4.
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Auger et al. (1997) studied this question.
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