METHOD FOR FORMING MEMBER OF TURBINE IMPELLER AND TURBINE IMPELLER Russian patent published in 2005 - IPC

FIELD: manufacture of castings having oriented and mono-crystalline structure of refractory nickel alloys.

SUBSTANCE: method comprises steps of forming model of member of turbine impeller having disc and blade portions; making disc portion of model of two plates in the form of circle sectors; connecting central angles of sectors in the same point and connecting arcs of sectors with blade portion of member; making ceramic mold according to prepared model; heating it and pouring melt into it; in order to form blade portion of member, pouring refractory nickel-base alloy and starting process of oriented crystallization; in order to form disc portion of member, pouring deformed refractory nickel-base alloy and terminating oriented crystallization process. Method allows produce built-up impellers of turbines whose discs with blades have mono-crystalline structure of predetermined crystallographic orientation and sufficient mechanical strength.

EFFECT: possibility for changing portion of disc with blades at restoration of it.

5 cl, 2 dwg, 4 ex