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Forced Chemical Vapor Infiltration (FCVI) method was used in fabricating the Nicalon TM!Silicon Carbide composites. Both through-thickness and In-plane (fiber fabric plane) moduli were determined using ultrasonic techniques. The through-thickness moduli were found to be much less than the inplane moduli. Both in-plane and through-thickness moduli were significantly decreased with an increased porosity. The experimental results for the moduli were found to be in good agreement with a theoretical model.

Measurement of elastic moduli of porous SiC/SiC ceramic matrix composites using ultrasonics