The corrosion behavior of various CVD SiC coatings in molten silicon

Corrosion by molten silicon of different SiC CVD coatings has been investigated at 1450 °C and 1550 °C by analyzing the deteriorated zone with electron microscopies. The influence of the microstructure on the corrosion mode is finely considered. The most resistant material consists of wide and align...

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Bibliographic Details
Published in:Ceramics international 2024-01, Vol.50 (2), p.3877-3886
Main Authors: Berdoyes, I., Plaisantin, H., Danet, J., Lepetitcorps, Y., Roger, J.
Format: Article
Language:English
Subjects:
B. Composites
B. Electron microscopy
C. Corrosion
D. SiC
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Summary:Corrosion by molten silicon of different SiC CVD coatings has been investigated at 1450 °C and 1550 °C by analyzing the deteriorated zone with electron microscopies. The influence of the microstructure on the corrosion mode is finely considered. The most resistant material consists of wide and aligned oriented columns, perpendicular to the substrate, corresponding to an arrangement of dense {111} planes parallel to the surface in contact with the molten silicon. Structural disorder (grain boundaries, structural defects) and disorientations (growth direction other than , secondary growth, column misalignment) make the CVD SiC coating more vulnerable to corrosion.
ISSN:0272-8842
DOI:10.1016/j.ceramint.2023.11.147