| 摘要 |
PURPOSE:To make a single crystal unidirectional solidifying material having large diameter and long length without convection current to stable and good quality and to reduce the production cost, by adding a static magnetic field on an interface of the solidifying phase in the unidirectional forced-cooling solidification of molten raw material in a solidifying vessel. CONSTITUTION:The molten metal 1 in the solidifying vessel consisting of a refractory 3 is uniformly cooled from the bottom part by a cooling Cu box 9 and resistance wires 5 for circumferential heating, to make the unidirectional solidifying material 2. Then, by adding the static magnetic field caused by the unidirectional DC coil 7 at the circumference, the convection current at the interface is prevented and the large diameter and long single crystal unidirectional solidification is made to stable state. Therefore, the unidirectional solidification is stably generated, and the quality is become to good and production cost is reduced.
|
