Abstract
Nanomechanical dynamic analysis has been utilized to evaluate damping behavior of plasma sprayed carbon nanotube (CNT) reinforced Al2O3 ceramic coatings. Addition and dispersion of CNTs in Al2O3 matrix elicited modulus enhancement from 200 to 400 GPa. Tan delta increases from 0.26 for Al2O3 to 0.39 with 8 wt % CNT coating. CNT bending and curling, Al2O3 coating on CNT, interparticle Al2O3 friction, and CNT/splat sliding serve as strong loss mechanisms in imparting enhanced damping to Al2O3 nanocomposites reinforced with CNTs. Damping and fracture toughness of CNT-Al2O3 coating is semiempirically related to the enhancement of storage modulus and tan delta with varying CNT content and degree of dispersion.
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