| 摘要 |
1319893 Crystal growing TYCO LABORATORIES Inc 5 Aug 1971 [28 Aug 1970] 36794/ 71 Heading B1S In the growing of crystals from a melt by way of the edge-defined film fed growth process (EFG) wherein crystals are pulled from a film of liquid on the upper surface of a forming member having sharp boundary edges which defined the shape of the crystal being grown, a die comprising two parts 25 and 26 with a capillary 25 between them is placed in a crucible containing a melt, which melt passes up the capillary 25 to form a film on the upper surfaces 27 and 28 of the die. A plate (not shown) abutting a shoulder 36 supports the die in the crucible. Melt is admitted to the capillary via slots 36. The embodiment shown has pieces of wire 29 spacing parts 24 and 26, which parts may not be of the cylindrical shape shown. Ribs on part 26 may space it from part 24 as an alternative to wires 29. A further embodiment (Fig. 10, not shown) has two plates in abuttment instead of members 24 and 26, one plate having a shallow groove defining the capillary, this growing a single crystal in the form of a narrow strip, as opposed to the embodiment shown which is used in growing cylindrical crystals. The crystals may be of alumina. A heat shield for the top of the crucible is also described, and the crucible may also have a replaceable lining. |
