FIELD: manufacture of castings with oriented and mono-crystalline structure of refractory nickel alloys.
SUBSTANCE: method comprises steps of making model of member of nozzle apparatus having starting and blade portions; forming starting portion of model in the form of two plates being circle sectors; connecting centers of sectors in the same point; connecting arcs of sectors with blade portion of member; according to model making ceramic mold; heating it, pouring melt and realizing oriented crystallization of alloy; removing produced casting out of ceramic envelope and core; then extracting starting portion; mutually joining blade portions and forming impeller of turbine nozzle apparatus. Method provides possibility for making detachable nozzle apparatuses with blades having mono-crystalline structure and predetermined crystallographic orientation.
EFFECT: possibility for changing portions of nozzle apparatus at restoration.
4 cl, 1 dwg, 3 ex
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