Abstract
Thin films of La 2O 3, ZrO 2, TiAlN, TiN, Al 2O 3 and Ti have been synthesized on SiC fibers using rf/dc hollow cathode magnetron sputtering source. These coatings have been designed and implemented as a combination of diffusion barrier and compliant layer for a NiAl intermetallic matrix. The structural, microstructural, surface morphological and compositional properties of these thin films have been investigated as a function of deposition parameters. Coated fibers embedded in NiAl matrix were subjected to high-temperature treatment and were studied for the damage and the interdiffusion of these ceramic layers. The thermo-chemical compatibility of, and the fabrication-process-induced physical damages to, ceramic coatings are discussed in this paper and alternate methods for the fabrication of fiber-reinforced composites are suggested.
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