METHOD TO PRODUCE CASTINGS OF MONOCRYSTAL STRUCTURE Russian patent published in 1994 - IPC

FIELD: foundry, items production of high-temperature alloys with directed and monocrystal structure of assigned orientation, for instance, turbine blades. SUBSTANCE: decreased amount of scrap among castings resulted from macrostructure defects in serial and mass production at the expense of increased reliability in transport of crystallographic orientation from seed to casting. Seed is used under protective bed of 3 to 15 mm thickness. The seed is of an alloy being identical or similar to one of the casting as to melting point and type of crystal lattice. Mould pouring in is carried out after mould heated up to needed temperature and complete melting seed protective bed. Casting crystallization starts before complete dissolving seed material in protective bed melt. EFFECT: casting quality. 2 cl