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Chemical Degradation of Si^sub 3^N^sub 4^-Bonded SiC Sidelining Materials in Aluminum Electrolysis Cells
A thorough analysis of a silicon nitride (...)-bonded SiC sidelining material from a Hall-Heroult electrolysis cell is reported. Phase composition before and after chemical degradation of the material is obtained by quantitative analysis using Rietveld refinement of X-ray diffraction data and chemic...
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Published in: | Journal of the American Ceramic Society 2009-06, Vol.92 (6), p.1296 |
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Main Authors: | , , |
Format: | Article |
Language: | English |
Subjects: | |
Online Access: | Get full text |
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Summary: | A thorough analysis of a silicon nitride (...)-bonded SiC sidelining material from a Hall-Heroult electrolysis cell is reported. Phase composition before and after chemical degradation of the material is obtained by quantitative analysis using Rietveld refinement of X-ray diffraction data and chemical analysis. The main degradation products as a result of the oxidation of ... binder phase are ... in the upper part and ... in the lower part of the sidelining. The microstructure of α-... (needle) and β-... (shell) as well as the degradation products ... (fiber) and ... (flake) were revealed by electron microprobe analysis. Chemical reactions and degradation mechanisms are proposed based on the presented findings. The degradation in the lower part is more severe than that in the upper part because Na diffusion from the cathode enhances the oxidation of ... The degradation changes the physical properties of ...-bonded SiC such as density and porosity. (ProQuest: ... denotes formulae/symbols omitted.) |
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ISSN: | 0002-7820 1551-2916 |