Thin-walled mono- and bilayered ceramic tubes in the system Si-0-C-(N) were obtained by centrifugal casting of a polysiloxane/filler suspension. Si and SiC powders were dispersed in polyorganisiloxane/triethoxysilane solutions. After centrifugal casting in a Teflon tube with a rotational speed of 2000 rpm and subsequent cross-linking at 130 deg Ca and 60 rpm, the tubes were pyrolyzed in argon or in nitrogen at 1400-1600 deg C. Bilayered tubes with controlled variation of porosity were obtained by overcasting the monolayer green tubes with a modified slurry composition.
Origin
University Of Erlangen, Germany
Journal Title
Jacs 86 7 2003 1211-1213
Sector
Special Glass
Class
S 2544