Control of seed melt-back during directional solidification...

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

B - Operations, Transporting

22

D

148/1.2

B22D 25/00 (2006.01) B22D 27/04 (2006.01) C30B 11/14 (2006.01)

Patent

CA 1211341

Abstract of the Disclosure 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.

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