Control of seed melt-back during directional solidification of m

Details Control of seed melt-back during directional solidification of m Control of seed melt-back during directional solidification of m

1982-01-27

1983-11-01

Lin, Kuang Y.

Metal founding

Process

Shaping liquid metal against a forming surface

1641221, 156616R, B22D 2500

Patent

active

044125771

ABSTRACT:
In the manufacture of a single crystal article, by the directional solidification of a metal in a ceramic mold the melt-back of a seed crystal is controlled to provide high casting yield. The melt-back, measured as a fraction of the original length of the seed, is preferably between 25-75%, more preferably between 33-67%. Diametrical clearance between the seed and mold is also closely controlled, between 0.06-0.25 mm, to eliminate extraneous grain nucleation.

REFERENCES:
patent: 3260505 (1966-07-01), Ver Snyder
patent: 3494709 (1970-02-01), Piearcey
patent: 3763926 (1973-10-01), Tschinkel et al.
patent: 3857436 (1974-12-01), Petrov et al.
patent: 4015657 (1977-04-01), Petrov et al.
patent: 4190094 (1980-02-01), Giamei
patent: 4209348 (1980-06-01), Duhl et al.
patent: 4289570 (1981-09-01), Terkelsen

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