Mold having a helix for casting single crystal articles

Details Mold having a helix for casting single crystal articles Mold having a helix for casting single crystal articles

1982-08-20

1984-05-29

Hampilos, Gus T.

Metal founding

Means to shape metallic material

United particle type shaping surface

1641222, 164125, B22C 904

Patent

active

044508891

ABSTRACT:
A ceramic shell mold for directional solidification of a single crystal metal article has an improved starter section which converts columnar grain growth to single crystal grain growth. The pitch or lead of the helix is chosen so that the separation between adjacent turns of the helix is less than twice the thickness of the layered ceramic shell material which comprises the mold. Thus, when the ceramic shell mold is formed by the repetitive application of layers of ceramic to a wax pattern, the gap between adjacent turns of the helix will be bridged when the mold has reached 50-80% of its final thickness. Then, continued accumulation of ceramic layers bridges the turns of the helix thereby giving it strength. A helical passage diameter in the 8-10 mm range significantly increases single crystal casting yields compared to smaller diameters commonly used heretofore.

REFERENCES:
patent: 3537949 (1970-11-01), Brown
patent: 3712368 (1973-01-01), Phipps
patent: 4111252 (1978-09-01), Day et al.
patent: 4133368 (1979-01-01), Hayes
patent: 4180119 (1979-12-01), Burd et al.

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