Abstract
Abstract Pyrolytic conversion of silicon-containing preceramic polymers to oxycarbide matrix composites may significantly be changed in the presence of active filler dispersoids. The formation of novel oxycarbide composite materials from titanium- and chromium-containing polysiloxane precursors was predicted based on thermodynamic phase equilibria calculations and investigated up to temperatures of 1400°C. During heat treatment the transition metals react with gaseous and solid decomposition products of the polymeric matrix and facilitate the formation of carbide and silicide phases embedded in a silicon oxycarbide matrix. A variety of active fillers may be used to tailor microstructure formation of polymer derived ceramic composite materials in order to make bulk component fabrication with a broad range of compositions and properties possible.
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