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Advancement of cellular ceramics made of silicon carbide for burner applications

: Füssel, A.; Klemm, H.; Boettge, D.; Marschallek, F.; Adler, J.; Michaelis, A.

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IOP conference series. Materials science and engineering 18 (2011), Symposium 12, Art.182001, 6 S.
ISSN: 1757-8981
ISSN: 1757-899X
International Congress on Ceramics (ICC) <3, 2010, Osaka>
Zeitschriftenaufsatz, Konferenzbeitrag, Elektronische Publikation
Fraunhofer IKTS ()
ceramic foam; porous burner; silicon carbide

Lower emissions of CO and NOx as well as a higher power density were observed in combustion processes performed in porous media like ceramic foams. Only a few materials are applicable for porous burners.
Open-celled ceramic foams made of silicon carbide are of particular interest because of their outstanding properties. Two different SiC materials have been investigated, silicon-infiltrated silicon carbide
(SiSiC) and pressureless sintered silicon carbide (SSiC). The oxidation behaviour of both has been characterized by furnace oxidation and burner tests up to 500 h operating time. Up to a temperature of 1200 °C SiSiC exhibited a good oxidation resistance in combustion gases by forming a protective layer of silica. High inner porosity up to 30% in the ceramic struts was found in the SSiC material. Caused by inner oxidation processes the pure material SSiC allows only short time applications with a temperature limit of 1550 °C in combustion gases. An increase of the lifetime of the SSiC foams was obtained by development of a new SSiC with an inner porosity of less than 12%. The result was a considerable reduction of the inner oxidation processes in the SSiC struts.