Version 1
: Received: 6 August 2024 / Approved: 7 August 2024 / Online: 7 August 2024 (07:02:55 CEST)
How to cite:
Yurkov, A. Silicon Carbide-Silicon Nitride Materials: Part 2. Corrosion Resistance and Oxidation in Al Reduction Cells and at Lab Testing. Preprints2024, 2024080479. https://doi.org/10.20944/preprints202408.0479.v1
Yurkov, A. Silicon Carbide-Silicon Nitride Materials: Part 2. Corrosion Resistance and Oxidation in Al Reduction Cells and at Lab Testing. Preprints 2024, 2024080479. https://doi.org/10.20944/preprints202408.0479.v1
Yurkov, A. Silicon Carbide-Silicon Nitride Materials: Part 2. Corrosion Resistance and Oxidation in Al Reduction Cells and at Lab Testing. Preprints2024, 2024080479. https://doi.org/10.20944/preprints202408.0479.v1
APA Style
Yurkov, A. (2024). Silicon Carbide-Silicon Nitride Materials: Part 2. Corrosion Resistance and Oxidation in Al Reduction Cells and at Lab Testing. Preprints. https://doi.org/10.20944/preprints202408.0479.v1
Chicago/Turabian Style
Yurkov, A. 2024 "Silicon Carbide-Silicon Nitride Materials: Part 2. Corrosion Resistance and Oxidation in Al Reduction Cells and at Lab Testing" Preprints. https://doi.org/10.20944/preprints202408.0479.v1
Abstract
The key question for the understanding of corrosion phenomena of Si3N4-SiC material in Al reduction cell – whether corrosion by gases (and oxidation in particular) opens way for the corrosion by molten cryolite, or corrosion of Si3N4-SiC by cryolite plays its own role in degradation of the material in service. More probably the reactions of silicon carbide and silicon nitride with molten cryolite go after the stage of pre oxidation to silicon dioxide.
The corrosion of Si3N4-SiC material in the reduction cell may take place by “gas-solid” reaction and by “liquid-solid” reaction.
There are several variants of lab corrosion test for the evaluation of corrosion resistance of Si3N4-SiC material to cryolite. The results of investigation of Si3N4-SiC lab corrosion test give no direct evidence of selective dissolution of specific phase (Si3N4 or SiC, α-Si3N4 or β-Si3N4) in cryolite. The existing variants of lab corrosion testing require clarification.
Keywords
silicon carbide; silicon nitride; corrosion; cryolite; oxidation; Al reduction cell
Subject
Chemistry and Materials Science, Ceramics and Composites
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
