초록 ▼

Production of low oxygen forms of tantalum and other refractory metals providing hydrided powder of the metal, forming a tube (10), pouring the metal into the tube, dehydriding the powder in the tube and sealing the tube and extruding to form a rod encased in the tube and further fabricating the rod

Production of low oxygen forms of tantalum and other refractory metals providing hydrided powder of the metal, forming a tube (10), pouring the metal into the tube, dehydriding the powder in the tube and sealing the tube and extruding to form a rod encased in the tube and further fabricating the rod.

대표청구항 ▼

[ What is claimed is:] [1.]1. Method of producing tantalum wires in physical and chemical forms suitable for usage as lead wires of tantalum anodes of electrolytic capacitors, the method comprising the steps of:(a) providing tantalum hydride of loose powder form in a range from plus 44 mesh to minus

[ What is claimed is:] [1.]1. Method of producing tantalum wires in physical and chemical forms suitable for usage as lead wires of tantalum anodes of electrolytic capacitors, the method comprising the steps of:(a) providing tantalum hydride of loose powder form in a range from plus 44 mesh to minus 250 mesh size,(b) forming a copper can of extrusion billet form with an end with an opening and tube extension thereof,(c) filling the can with the powder through said opening and tube extension,(d) heating the filled can to about 800.degree. C. and vacuum pumping to remove hydrogen from the hydride powder and to remove hydrogen from the can via said opening and tube extension,(e) sealing the can,(f) preheating the filled can at 700-900.degree. C. for as long as necessary for extrusion preparation,(g) extruding the heated can in a single pass for consolidation of the powder therein to achieve area reduction and to form a further workable rod or wire,(h) cooling the extruding billet and removing the copper therefrom, to expose a tantalum rod or wire,(i) working the rod or wire to a final wire size, whereby a low oxygen form of tantalum can be provided through its hydride and a low oxygen level preserved in the course of dehydriding, extrusion and further working steps to enable production of a lead wire with an oxygen content of less than 100 ppm.