Abstract
Non-oxide ceramics would be exposed to oxidizing and corrosive environments in applications. Silicon carbide (SiC) and silicon nitride (Si3N4) form silica (SiO2) protective films in an oxidizing environment. The oxidation of pure SiC is similar to that of pure Si, following a linear-parabolic rate law. The oxidation of pure Si3N4 is more complex due to a silicon oxynitride layer below the oxide. Volatilization can occur via active oxidation to SiO(g) at low oxygen pressures or formation of Si(OH)4(g) in a combustion environment which has water vapor. Low melting silicate phases may form from impurities in the environment or ceramic. Unique oxidation issues with polymer-derived Si-based ceramics and fiber reinforced ceramic matrix composites are covered. Refractory oxide coatings for silicon based ceramics are used to limit corrosion. Oxidation of borides, carbides, and nitrides are discussed. Some show promise for use at ultra-high temperatures.
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