Abstract
The formulation of Deal and Grove for the oxidation of silicon and the growth of a silica layer is revisited to include the effects of a protective coating layer. The linear-parabolic equation of the form xo2+Axo=Bt is still applicable, but the expression for the constant A must be modified to account for the coating. The modified expression for A is a linear function of the coating thickness. The modified formulation is applied to assess recently published experimental results for the oxidation of a silicon bond coat in an environmental barrier coating. Application of the modified expression for A to the experimental results leads to an estimate of the ratio of the oxidant permeability in the oxide to its permeability in the coating.
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