VERFAHREN ZUM HERSTELLEN EINER SCHALENFORM FUER DIE ERZEUGUNG EINES EINKRISTALLS UND NACH DEM VERFAHREN HERGESTELLTE FORM

摘要

A shell mold for producing directionally solidified single crystal metal castings in which use is made of a crystal selector of helical shape wound about a support of a non heat disposable material which eliminates the need for providing a crystal selector of sufficient dimension for self support or other supporting means which may form a part of the pattern assembly about which the shell mold is formed.