Effect of TiB₂ content on resistance to sodium penetration of TiB₂/C cathode composites for aluminium electrolysis^①

来源期刊：中南大学学报(英文版)2004年第4期

论文作者：李劼 方静 李庆余 赖延清

文章页码：400 - 404

Key words：aluminium electrolysis;TiB₂;cathode;composite material;sodium penetration

Abstract: TiB₂/C cathode composites with various contents of TiB₂ were prepared and their characterizations were observed and compared. The expansion of samples due to sodium and bath penetration was tested with a modified laboratory Rapoport apparatus and the appearances of the cut sections of specimens after electrolysis were studied. The results show that the mass of TiB₂/C cathode composites with mass fraction of TiB₂ less than 70% appreciably increases,but that of the composites with mass fraction of TiB₂ more than 70% decreases slightly after being baked. The resistance to sodium and bath penetration of TiB₂/C cathode composites increases with the increase of TiB₂ content, especially in the composites with high TiB₂ content. TiB₂/C cathode composites have high resistance to the penetration of sodium and bath as well as good wettability by molten aluminum, and keep integrality and have little change of appearance after electrolysis, which indicates that TiB₂/C cathode composites can be used as inert wettable cathode for aluminum electrolysis.