Method for producing directionally solidified cast alloy articles and apparatus therefor

摘要

A method of producing directionally solidified cast alloy articles wherein a porous shell mold having a bottom fill cavity is positioned within an exothermic mass and over a chamber located over a chill plate, molten metal is poured into the chamber whereby the mold cavity is filled and the exothermic material is ignited from beneath the exothermic mass and the mold cavity to cause the mold to be heated to a temperature above the melting temperature of the cast metal, heat is then extracted predominantly from one end of the cast metal to establish an improved temperature gradient along the length of the metal in the cavity and the metal is directionally solidified.