CONTROL OF SEED MELT-BACK DURING DIRECTIONAL SOLIDIFICATION OF METALS

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 pre...

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Bibliographic Details
Main Authors GIAMEI, ANTHONY F, ANDERSON, NEAL P, SALKELD, RICHARD W
Format Patent
LanguageEnglish
French
Published 16.09.1986
Edition4
Subjects
AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUSPOLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE
APPARATUS THEREFOR
CASTING
CASTING OF METALS
CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
CHEMISTRY
CRYSTAL GROWTH
METALLURGY
PERFORMING OPERATIONS
POWDER METALLURGY
PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE
REFINING BY ZONE-MELTING OF MATERIAL
SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE
SINGLE-CRYSTAL-GROWTH
TRANSPORTING
UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL ORUNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL
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Summary: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.
Bibliography:Application Number: CA19830435284