METHOD OF PRODUCTION OF FOIL FROM BERYLLIUM Russian patent published in 2007 - IPC B21B1/40 B21B3/00 C23C22/34 

FIELD: mechanical engineering; production of foil from beryllium.

SUBSTANCE: proposed method consists in placing the beryllium blank into metal casing, sealing-up, rolling at temperature of 600-800°C and removal of casing. Prior to placing the blank into casing, it is placed into solution for passivation and is heated in air at temperature of 550-600°C during period sufficient for forming modified passive film up to 10 mcm in thickness; passivation solution contains the following components, g/l: potassium bichromate, 150-200; hydrofluoric acid, 9.5-9.8; sodium fluoride, 5-10; beryllium, 0.2-0.4; water, up to 1 l. Proposed method excludes fusion of beryllium blank with metal of casing in rolling and contamination of beryllium with alloying elements of metal of casing.

EFFECT: enhanced mechanical properties of foil; increased vacuum density at retained radiation transparence.

3 cl, 3 tbl, 1 ex