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Corrosion behaviour of Si3N4 materials in sulphuric acid contaminated with KF

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

Mandal, H. ; European Ceramic Society:
Euro Ceramics VIII. Pt.2 : Proceedings of the 8th conference and exhibition of the European Ceramic Society, Istanbul, Turkey, June 29 - July 3, 2003, Eighth ECerS
Uetikon-Zürich: Trans Tech Publications, 2004 (Key engineering materials 264/268)
ISBN: 0-87849-946-6
European Ceramic Society (Conference and Exhibition) <8, 2003, Istanbul>
Euro-Ceramics (ECerS) <8, 2003, Istanbul>
Fraunhofer IKTS ()
corrosion mechanism; fluorine ion; hot sulphuric acid; amorphous grain boundary phase; bending strength; microstructure; corrosion layer morphology; corrosion layer thickness; mass loss; Si3N4

This work reports on the influence of small amounts of Fluorine ions (<=1 wt.-%) in hot sulphuric acids on the corrosion behavior of gas pressure sintered Si(sub 3)N(sub 4) ceramics with varying amorphous grain boundary phases. The corrosion behavior was characterized by mass loss, bending strength, thickness and morphology of the corrosion layer. The results were discussed with respect to the microstructure and the mechanisms of corrosion.