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CVI-R Gas Phase Processing of Porous, Biomorphic SiC-Ceramics
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2001
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Materials ScienceChemical EngineeringEngineeringPine WoodCeramicsCeramic MaterialNatural Pine WoodChemical Vapour InfiltrationCeramic SynthesisStructural CeramicCeramic TechnologyWood ModificationMicrostructureBiomorphic Sic-ceramics
Natural pine wood was converted into biomorphic SiC-ceramics by CVI-R processing (chemical vapour infiltration - reaction). The wood samples were first pyrolyzed in inert atmosphere at temperatures of 800 C to yield biocarbon-derived template structures. Subsequently, the biocarbon preforms were infiltrated with silicon by isothermal CVI processing with MTS (methyltrichlorosilane) in excess of hydrogen at temperatures between 800 and 850 C, then converted into SiC-ceramic by annealing in inert atmosphere at temperatures between 1200-1600 C. During processing, the inherent open porous structure of the pine wood is retained down to the submicrometer level, yielding a highly porous SiC-ceramic with a unique microcellular morphology. (orig.)