OPEN-CELLED SILICON CARBIDE FOAM CERAMIC AND METHOD FOR PRODUCTION THEREOF

摘要

The invention relates to the field of ceramics and open-celled silicon carbide foam ceramics, which can find application, for example, as high temperature- and thermal shock-resistant silicon carbide foam. The aim of the invention is to disclose an open-celled silicon carbide foam ceramic with improved thermal shock resistance, which may be produced by a simple method. Said aim is achieved with an open-celled silicon carbide foam ceramic, the structure of which is made up of sintered silicon carbide with a 5 to 30 % pore volume of closed pores with an average diameter of < 20µm. The invention further relates to a method for the production of an open-celled silicon carbide foam ceramic, whereby coarse and fine silicon carbide powder in the ratio 20: 80 to 80: 20 parts are mixed and a suspension produced therefrom. An open-celled foam or open-celled network is then coated with said suspension, the foam or network material removed and sintering carried out at a temperature of > 1800 DEG C under a protective atmosphere or in vacuo.