Patent ID: 7779889
Filing Date: 2010-08-24
Classification: B22C,B22D,C30B

Abstract:
1. 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, comprising: producing a wax pattern, the wax pattern comprising: forming a ceramic shell mold from said wax pattern; incorporating the starter seed into the mold, the starter seed including said flat face for localizing the crystalline orientations; pouring a metal into the mold; directionally solidifying the metal in the mold from the starter seed, so that the crude seed obtained has the same crystallographic structure as the nozzle; and separating the obtained crude seed from the nozzle for subsequent use as a starter seed.