Carbide Derived Carbon (Cdc) Coatings for Tyranno Zmi Sic Fibers

Carbide Derived Carbon (CDC) coatings have been formed on Tyranno ZMI SiC fibers by the extraction of Si with chlorine in the temperature range of 550–700°C at atmospheric pressure. The kinetics and mechanisms of the growth of carbon coating on the Tyranno ZMI SiC fiber have been investigated, and process parameters have been determined which allow for the control of coating thickness. Uniform carbon coatings have been obtained with a good adherence to the SiC fibers. The results show that the top layer of Tyranno ZMI SiC fibers can be transformed to carbon with improved mechanical properties at moderate temperatures within a short period of time. CDC coated Tyranno ZMI SiC fibers have a broad range of potential applications in the ceramic matrix composites (CMCs). Moreover, CDC coatings on SiC fibers can also be used as templates for synthesis of BN, AlN and other coatings with improved oxidation resistance.