FREMGANGSMAATE FOR FREMSTILLING AV KOMPONENTER AV ALKALIMETALLOKSYD-BETA-ALUMINIUMOKSYD

摘要

1. A method of preparing alcaline beta alumina objects in which the following successive steps are carried out : A) an intimate mixture is realized, comprising alumina and sodium carbonate powders in such quantities, that a ratio Al2 O3 /Na2 O of between 5 and 11 is obtained, B) said mixture is heated in an open crucible, C) the mixture is cooled down freely, D) the powder thus obtained is crushed, E) said objects are shaped, F) said objects are introdused into a sintering enclosure G) the objects are sintered, characterized in that into said sintering enclosure, at least one compound chosen from the group comprising AlCl3 , the boranes, the boron halogenides, the silanes, the silicium halogenides, and borax, which compound is apt to decompose during the sintering process and to build up on at least one of the walls of said objects a thin layer of a glass presenting a high ionic conductivity for the sodium ions.