Abstract
The salient elements of the theory of oxide growth under an environmental barrier coating are reviewed. The results from steam oxidation tests recently conducted on environmental barrier coated specimens are reported. The oxide thickness between the ceramic topcoat and Si substrate are reported as a function of time. Also, the results from previously conducted steam oxidation tests are reviewed. An approach to estimate the permeability of water vapor through the various coating systems using the oxide thickness versus time measurements and the theory of oxide growth under an environmental barrier coating is demonstrated. The approach allows one to rank the protection efficiency of the various coating systems against steam oxidation.
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