APPARATUS FOR MOULDING TUBULAR PARTS BY ISOSTATIC COMPRESSION

摘要

An outer casing (1) and an inner mandrel (2), both of which are cylindrical and are substantially coaxial, with powder (3) for manufacturing the tubular parts (11) filling the space which lies between them, contain a stationary distance piece (5) disposed against a shoulder (4) formed in the upper portion of the mandrel (2) and around the upper portion. A cover (6) also is provided around the upper portion and bears firstly against the upper end of the stationary distance piece (5) and secondly against the end of the casing (1), the cover (6) being hollowed out so as to provide an annular space (7) around the stationary distance piece (5), a moving distance piece (8) being disposed in the space (7) and bearing against the surface of the powder (3) so that during isostatic compression, the upper end of the moulded part (11) can extend into the space (7) while driving the moving distance piece (8). The apparatus can be used to manufacture beta sodium alumina tubes suitable for use as solid electrolytes in sodium-sulphur electric cells.