METHOD OF FORMING HOLLOW SINGLE-CRYSTAL CYLINDRICAL TUBES Russian patent published in 2017 - IPC C30B29/66 C30B15/00 C30B33/06 C30B29/02 H01J45/00 

FIELD: electricity.

SUBSTANCE: method of forming hollow single-crystal cylindrical tubes includes growing melt-cylindrical single crystals by pulling up with a single-crystal seed of the required orientation, separating two blanks of the required length from the single crystal, their mechanical and electrochemical machining, resulting in two hollow polyhedron cylinders with a predetermined geometry, determining the location of the desired crystallographic directions on the surfaces of the said cylinders, spark cutting and removing portions of cylinders with an intermediate crystallographic orientation, after which the remaining cylinders are rotated relative to each other about the longitudinal axis, joined, the cylinders are matched by electron beam welding, then the technological areas are separated by spark cutting from the workpiece, and electrochemical processing of welded mono-faceted single-crystal cylinder is performed.

EFFECT: invention allows to obtain tubes with a homogeneous mono-faceted crystallographic orientation of the working surface and isotropic physico-mechanical properties.

10 dwg