Erosion of sintered TiB2-cathodes during cathodic aluminium deposition from LiCl/AlCl3 melts |
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Authors: | H Wendt S Dermeik |
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Affiliation: | (1) Institut für Chemische Technologie, TH Darmstadt, Petersenstr. 20, D-6100 Darmstadt, FRG |
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Abstract: | Using an aluminium dissolution/deposition electrolysis cell, TiB2, TiB2/TiC and TiC sintered specimens of different porosity were tested for erosion resistance on exposure to liquid electrodeposited aluminium at 700°C to determine whether cathodes coated with such materials can be applied in aluminium chloride electrolysis cells. Although not wetted by liquid aluminium, the TiC and the TiB2/TiC composites were extensively eroded. The densest TiB2 specimens showed the highest resistance against liquid aluminium. The erosion rate of TiB2 specimens of different density after exposure to the test environment for over 200 h was almost identical and reached a value of 0.16 cm y–1. The observed wear rates exceed the values predicted on the basis of published solubility data by a factor of approximately 10. |
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