Thermal and electrical properties of a white-eucalyptus carbon preform for SiC/Si ecoceramics

Abstract

The thermal conductivity κ and electrical resistivity ρ of a white-eucalyptus cellular carbon preform used to fabricate silicon-carbide-based (SiC/Si) biomorphic ceramics have been measured in the 5-to 300-K temperature interval. The carbon preform was obtained by pyrolysis (carbonization) of white-eucalyptus wood at 1000°C in an argon ambient. The κ( T ) and ρ( T ) relations were measured on samples cut along the tree growth direction. The experimental data obtained were processed.