公开(公告)号：FR2651774A1

公开(公告)日：1991-03-15

申请号：FR9011130

申请日：1990-09-07

Applicant: UNITED TECHNOLOGIES CORP

Inventor： VINE RAYMOND W ,  ANDERSON NEAL P

IPC: F01D5/04 ,  C04B35/50 ,  C04B41/87 ,  C23C4/02 ,  C23C4/10 ,  C23C14/02 ,  C23C14/06 ,  C23C14/08 ,  C23C28/00 ,  F01D5/28

公开(公告)号：DE4028173A1

公开(公告)日：1991-03-14

申请号：DE4028173

申请日：1990-09-05

Applicant: UNITED TECHNOLOGIES CORP

Inventor： VINE RAYMOND W ,  ANDERSON NEAL P

IPC: F01D5/04 ,  C04B35/50 ,  C04B41/87 ,  C23C4/02 ,  C23C4/10 ,  C23C14/02 ,  C23C14/06 ,  C23C14/08 ,  C23C28/00 ,  F01D5/28

公开(公告)号：FR2550556B1

公开(公告)日：1990-08-17

申请号：FR8313072

申请日：1983-08-09

Applicant: UNITED TECHNOLOGIES CORP

Inventor： SALKELD RICHARD W ,  ANDERSON NEAL P ,  GIAMEI ANTHONY F

IPC: B22D27/04 ,  C30B11/14 ,  C30B21/02 ,  C30B19/00

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.

公开(公告)号：CA1212597A

公开(公告)日：1986-10-14

申请号：CA419723

申请日：1983-01-18

Applicant: UNITED TECHNOLOGIES CORP

Inventor： GIAMEI ANTHONY F ,  SALKELD RICHARD W ,  ANDERSON NEAL P

IPC: B22D27/04 ,  C30B11/00 ,  C30B11/14 ,  C30B21/02 ,  C30B29/52 ,  B22C9/00 ,  B22D25/00

Abstract: Disclosed is a method of epitaxially casting single crystal metal articles in molds, which comprises causing the solidification interface velocity vector to rotate through at least 90 degrees, preferably 180-540 degrees, about the axis of overall directional solidification growth. In addition, a mold section has a small passageway configured to prevent line of sight communication between the portion where the seed is contained and the article portion of the mold. Preferably, the passageway is shaped like a helix of 0.8-1.5 turns. A second seed can be formed in the mold of an article made from a first seed, and used to make a second casting. The invention reduces the normal increase in crystallographic variability which would otherwise be associated with such practice.