Offenzellige Siliciumcarbid-Schaumkeramik und Verfahren zu ihrer Herstellung

WO 200220426 A UPAB: 20020610 NOVELTY - An open-celled silicon carbide foam ceramic comprises a three-dimensional crosslinked ceramic structure of open cells lying between stays made of sintered silicon carbide with a 5-30% pore volume of closed pores with an average diameter of less than 20 microns m. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for the production of an open-celled silicon carbide foam ceramic comprising mixing coarse silicon carbide powder and fine silicon carbide powder with sintering additives to form a suspension, coating an open-celled foam with this suspension, drying, removing the foam and sintering the remaining body at at least 1800 deg. C in a protective gas or vacuum. Preferred Features: The sintering additive is made of boron and carbon, or boron, aluminum and carbon. USE - Used as a diesel soot filter, heating element or solar receiver. ADVANTAGE - The foam has a high thermal shock resistance