PROCEDURE FOR PRODUCTION OF MONO-CRYSTAL NUCLEI SIMULTANEOUS WITH MONO-CRYSTAL PART CASTING Russian patent published in 2011 - IPC C30B11/00 C30B11/14 C30B29/52 B22C7/02 B22C9/04 B22D27/04 

FIELD: metallurgy.

SUBSTANCE: here is disclosed procedure for production of at least one mono-crystal nucleus acceptable as seed at fabrication of high pressure mono-crystal guiding nozzle unit of turbo-machine with at least one blade between two platforms by metal casting. The procedure consists in making wax pattern 10 containing first element 11 forming a pattern of the guiding nozzle unit, second element 13 forming pattern of seed and containing a flat shear of localisation of crystal orientation, and at least third element 14 including pattern 14A of source nucleus with a flat shear of localisation of crystal orientation. There is formed a ceramic case casting mould on base of the said wax pattern 10 and there is introduced seed containing the said flat shear of localisation of crystal orientation into a casting mould. Metal is cast into a mould. Oriented crystallisation of metal in the cast mould on base of seed is carried out so, as to facilitate the same crystallographic structure of produced source nucleus as of the part. Produced source nucleus is separated from the part for further usage as seed.

EFFECT: simplified production of nuclei, thus reducing cycle of parts fabrication; essential reduction of their prime cost.

9 cl, 4 dwg