MICROSTRUCTURE AND INTERFACIAL PROPERTIES OF LASER ABLATION COATED, FIBER-REINFORCED CERAMIC COMPOSITE

摘要

Titania (TiO_2), titanium aluminate (TiO_2 centreAl_2O_3), and enstatite (MgSiO_3) multilayer films were deposited on to a sapphire (A1_2O_3) fiber by the pulsed laser ablation technique using a KrF excimer laser. MgSiO_3 was used for the debonding interphase, and TiO_2 and TiO_2 centre dot Al_2O_3 were used to protect MgSiO_3 and A1_2O_3 from chemical reaction during processing and operation of composite. The composite was hot pressed by embedding coated fibers in A1-2O-3 matrix. SEM and EDS were used to analyze the microstructure and microcomposition of the coating layers before and after hot pressing. The partial decomposition of MgSiO_3 to SiO_2 glassy phase was observed during hot pressing. A push-out experiment was also conducted to determine interfacial properties of the hot pressed composite.