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Corrosion of silicon nitride materials in acidic and basic solutions and under hydrothermal conditions

: Herrmann, M.; Schilm, J.; Michael, G.

Brito, M.E. ; American Ceramic Society -ACerS-, Westerville/Ohio:
Silicon-based structural ceramics for the new millennium : Proceedings of the Silicon-Based Structural Ceramics for the New Millennium Symposium held at the 104th annual meeting of the American Ceramic Society, April 28 - May 1, 2002, in Stl. Louis, Missouri
Westerville, Ohio: American Ceramic Society, 2003 (Ceramic Transactions 142)
ISBN: 1-574-98157-9
Silicon Based Structural Ceramics for the New Millennium Symposium <2002, St. Louis, Mo.>
American Ceramic Society (Annual Meeting) <104, 2002, St. Louis/Mo.>
Fraunhofer IKTS ()

The corrosion behavior of gas pressure sintered Si nitride ceramics with different amts. and compns. of the grain boundary phases was analyzed in acids, bases and under hydrothermal conditions. The studies show, that the corrosion is strongly affected by the SiO2 content in the grain boundary phase and the amt. of the additives. The differences in the corrosion kinetics are correlated with the structure of the formed corrosion layer. Some correlations between compn. and corrosion stability in the different media are given.