Shape dependence of corrosion kinetics of Si3N4 ceramics in acids
| Autor: | J. Schilm, Mathias Herrmann |
|---|---|
| Přispěvatelé: | Publica |
| Rok vydání: | 2009 |
| Předmět: |
Constant composition
corrosion Materials science Process Chemistry and Technology Metallurgy Intergranular corrosion grain boundary phase Surfaces Coatings and Films Electronic Optical and Magnetic Materials Corrosion chemistry.chemical_compound silicon nitride Silicon nitride chemistry visual_art Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Ceramic Composite material Corrosion kinetics |
| Zdroj: | Ceramics International. 35:797-802 |
| ISSN: | 0272-8842 |
| Popis: | The corrosion behaviour of Si 3 N 4 ceramics with constant composition (Y 2 O 3 –Al 2 O 3 additives) but of different shapes – plate, cylinder and ball – was investigated in 0.5 mol/l H 2 SO 4 at 90 °C. The corrosion kinetics were measured using weight losses and thickness of the corrosion layers. The investigation showed that the corrosion depends on the shape of the samples. The differences in corrosion kinetics cannot be explained by the shrinking core mechanism. They are caused by different formation rates of the passivating SiO 2 -rich layers in the corroded materials. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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