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Corrosion of ceramic materials in hot gas environment

 
: Klemm, H.; Fritsch, M.; Schenk, B.

Edgar, L.-C.:
28th International Conference on Advanced Ceramics and Composites 2004. Vol.B : A collection of papers presented at the 28th International Conference and Exposition on Advanced Ceramics and Composites held in conjunction with the 8th International Symposium on Ceramics in Energy Storage and Power Conversion Systems ; January 25 - 30, 2004, Cocoa Beach, Florida
Westerville, Ohio: American Ceramic Society, 2004 (Ceramic engineering & science proceedings 25.2004,4)
pp.463-468
International Conference on Advanced Ceramics and Composites <28, 2004, Cocoa Beach/Fla.>
International Symposium on Ceramics in Energy Storage and Power Conversion Systems <8, 2004, Cocoa Beach/Fla.>
English
Conference Paper
Fraunhofer IKTS ()
ceramic material; hot gas environment; corrosion resistance; high temperature burner rig; alumina; mullite; rare earth disilicate; garnet structure; dense oxide surface layer; 1450 degC; 0.27 bar; Si3N4; SiC; ZrO2; Al2O3

Abstract
The corrosion resistance of various oxide and non-oxide ceramic materials in hot gas environment was investigated. The tests were performed in a high temperature burner rig at 1450°C with 100 m/s gas flow speed and a water vapor pressure of 0.27 bar. The corrosion of the materials was characterized by the measurement of the weight balance and microstructural investigations. Non-oxide ceramic materials based on silicon exhibited the typical degradation behavior with the formation and evaporation of silicon hydroxides. A different behavior was found in case of oxide materials. Meanwhile ZrO(sub 2) was found to be stable in this environment, a high corrosion attack was observed for alumina and mullite. Oxide compounds e.g. rare earth disilicates or garnet structures decompose with the formation of a fairly dense oxide surface layer protecting the materials from further corrosion.

: http://publica.fraunhofer.de/documents/N-35136.html