发明名称 |
CONTROL OF SEED MELT-BACK DURING DIRECTIONAL SOLIDIFICATION OF METALS |
摘要 |
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. |
申请公布号 |
CA1211341(A) |
申请公布日期 |
1986.09.16 |
申请号 |
CA19830435284 |
申请日期 |
1983.08.24 |
申请人 |
UNITED TECHNOLOGIES CORPORATION |
发明人 |
SALKELD, RICHARD W.;ANDERSON, NEAL P.;GIAMEI, ANTHONY F. |
分类号 |
B22D27/04;C30B11/14;C30B21/02 |
主分类号 |
B22D27/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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