Control of Interface Properties in Oxide Composites Via Fugitive Coatings
2008
Long-term durability of ceramic composites requires the retention of weak interfaces to promote crack deflection and subsequent sliding at the fiber–matrix boundary. The present article addresses the efficacy of fugitive carbon coatings in achieving this goal in all-oxide systems. A solution precursor route with a low-temperature pyrolysis treatment has been devised and implemented for coating oxide fibers within a woven cloth. The coating is oxidized following completion of matrix processing to produce an interfacial gap. Upon comparing the mechanical properties of two continuous fiber ceramic composites—with and without a fugitive coating—the gap is shown to reduce the interfacial sliding resistance and significantly enhance the fracture resistance of the composite. It also enables an extension in the useful life of the composite when subjected to long-term (1000 h) exposure at high temperature (1200°C). The results also suggest that modifications in the coating thickness may provide additional enhancement in composite durability.
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