Abstract: A process for manufacturing at least one single-crystal seed that can be used as a starter seed in the manufacture of a single-crystal high-pressure turbine nozzle, with at least one vane between two platforms, by metal casting, is disclosed. The process includes producing a wax pattern that includes a pattern for the nozzle, a pattern for the starter seed, and a pattern for a crude seed; forming a ceramic shell mold from the wax pattern; incorporating a starter seed into the mold; pouring metal into the mold; directionally solidifying the metal in the mold from the starter seed; and separating the crude seed from the nozzle. The starter seed and the crude seed each include a flat face for localizing the crystalline orientations. The crude seed has the same crystallographic structure as the nozzle.

Abstract: The present invention relates to a process for manufacturing at least one single-crystal seed that can be used as a starter seed in the manufacture of a single-crystal high-pressure turbine nozzle, with at least one vane between two platforms, by metal casting, wherein: a wax pattern is produced which comprises: a first element forming the pattern for the nozzle, a second element forming the pattern for the starter seed, including a flat face for localizing the crystalline orientations, and at least a third element incorporating a pattern for the crude seed with a flat face for localizing the crystalline orientations; a ceramic shell mold is formed from said wax pattern and a starter seed, including said flat face for localizing the crystalline orientations, is incorporated into the mold; a metal is poured into the mold; the metal undergoes directional solidification in the mold from the starter seed, so that the crude seed obtained has the same crystallographic structure as the part; and the crude seed o