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Kinetic studies of the corrosion of Si3N4 materials in acids

: Schilm, Jochen; Herrmann, Mathias; Michael, Grit


European Ceramic Society:
European Ceramic Society. Proceedings the 7th Conference and Exhibition. Part 2 : Brugge, Belgium, September 9 - 13, 2001, seventh ECerS
Uetikon-Zürich: Trans Tech Publications, 2002 (Key engineering materials 206/213)
ISBN: 0-87849-882-6
European Ceramic Society (Conference and Exhibition) <7, 2001, Brügge>
Euro-Ceramics (ECerS) <7, 2001, Brügge>
Fraunhofer IKTS ()
silicon nitride ceramic; corrosion; sulfuric acid; silicon nitride

The corrosion processes of Si3N4 materials contg. a glassy grain boundary phase in sulfuric acid at varying temps. was studied. Different ceramics were prepd. by varying the compn. and amt. of the grain boundary phase. The grain size distributions of the samples were varied by applying certain sintering regimes. The corrosion was characterized by wt. loss, thickness, and morphol. of the corroded layer. The results were discussed with respect to the microstructure and the mechanisms of corrosion. First attempts on modeling the corrosion processes considering a mixed-reaction control are described.