Process and apparatus for production of single-crystal turbine b

Details Process and apparatus for production of single-crystal turbine b Process and apparatus for production of single-crystal turbine b

1991-12-12

1994-01-04

Lin, Kuang Y.

Metal founding

Process

Shaping liquid metal against a forming surface

1643381, B22D 2704

Patent

active

052752283

ABSTRACT:
A process and apparatus for the production of a single-crystal article, such as a turbine blade, by casting a molten metal into a casting mold with a single crystal seed crystal at the bottom of the casting mold. The casting mold is heated and vacuum-purified after which the seed crystal is introduced into an opening at the bottom of the mold in a matter of a few seconds whereafter the molten metal is immediately cast onto the seed crystal in the casting mold. The seed crystal is carried by a holder which is lifted to bring the seed crystal into the open bottom of the casting mold in sealed relation in the mold.

REFERENCES:
Sulzer Technical Review, Mar. 1988, "An Alternative Process for the Manufacture of Single Crystal Gas Turbine Blades" by Staub, Walser and Wortmann, pp. 11-16.
Aviation Week & Space Technology, Dec. 3, 1979, vol. 111, No. 23, "Computer-Controlled Production Gains" by Jerry Mayfield, pp. 41-44 and 53.

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