Oxidation assessment of highly inhibited SiC coated carbon-carbon laminates using electrical resistance measurements
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The impact of oxidation on shear modulus, mass loss, and electrical resistance of carbon-carbon laminates at 900C is studied. This approach is unique in relating in-situ measured physical properties to mechanical properties at high temperature oxidative environment. The goal is to understand the relationship between the changes observed in the shear modulus and electrical resistance in relation to mass loss. In-situ electrical resistance measurements were taken at 900C and shear modulus measurements were taken at room temperature prior to and following oxidation. The results reveal that the electrical resistance, shear modulus, and mass loss are not independent of each other; as oxidation time increases, mass loss and electrical resistance increase whereas the shear modulus decreases. A simple analytical model is developed for electrical resistance simulation and is correlated to shear modulus within 5% of experimental observations.
