摘要:
A casting method includes forming a seed (20, 800). The seed has a first end (24) and a second end (22) and an inner diameter (ID) surface (34) and an outer diameter (OD) surface (36). The seed second end (22) is placed in contact or spaced facing relation with a chill plate (102). The first end (24) is contacted with molten material (50). The molten material is cooled and solidified so that a crystalline structure of the seed (20) propagates into the solidifying material (50). At least a portion of the seed (20) contacted with the molten material (50) has a solidus higher than a solidus of at least an initial pour portion (910) of the molten material (50).
摘要:
Procédé de fabrication d'une pièce par solidification d'un matériau semi-conducteur Procédé de fabrication d'une pièce (70) comportant un col (40) et un fût (60) prolongeant le col, la pièce comportant une portion monocristalline représentant plus de 80 % de son volume, le procédé comportant les étapes de : i) fourniture d'un creuset (5) contenant un bain (20) comportant un matériau semi-conducteur en fusion choisi parmi le silicium, le germanium et leurs mélanges, et d'un germe (25) solide comportant le matériau semi-cristallin, ii) mise en contact du germe avec le bain, iii) formation du col en translatant le germe par rapport au bain pour extraire et solidifier le matériau semi-conducteur hors du bain, et iv) formation du fût en refroidissant le bain et en réduisant la vitesse de translation du germe par rapport à l'étape iii), la pièce présentant au moins une section, transverse à l'axe (X) de translation du germe, dont l'aire est supérieure ou égale à 0,15 m 2 .
摘要:
A casting mold comprises a free form fabricated ceramic shell which has a thin outer wall defining a cavity adapted for receiving a molten metal. The shell is positioned within a container and spaced from the inner surface of the container. At least one support member substantially fills the space between the outer wall of the shell and the inner surface and reinforcing said shell.
摘要:
A method for producing a cast component comprises forming a thin shell ceramic casting mold with a wall thickness less than about 1.52mm (0.060 inches) by the photopolymerization of a ceramic filled resin. A molten metal is poured into the thin shell ceramic casting mold without providing additional support to the casting mold. A thermal gradient is moved through the molten metal within the thin shell ceramic casting mold to cause solidification into a cast component with a single crystal or directionally solidified microstructure.
摘要:
A casting mold comprises a free form fabricated ceramic shell which has a thin outer wall defining a cavity adapted for receiving a molten metal. The shell is positioned within a container and spaced from the inner surface of the container. At least one support member substantially fills the space between the outer wall of the shell and the inner surface and reinforcing said shell.