| 摘要 |
1,146,230. Zone-melting. SIEMENS A.G. 29 Dec., 1967 [30 Dec., 1966], No. 59230/67. Heading BIS. A rod is grown from a molten zone fed by at least two side-by-side supply rods and heated by induction, the degree of heating being more intense between the axes of the supply rods than outside them and the grown rod being concave at the solid/liquid interface. A molten zone may initially be formed between one supply rod and a thin seed, bridging to the second supply rod being effected as growing proceeds by lateral shifting of the seed. Use of a thick seed obviates need for the lateral shifting. The heating means may comprise two outwardly curving hairpin-like members 7 and 8 between the supply rods, the members being in series (Fig. 3), in parallel, or separate with a pancake coil in between. Alternatively, the heating means may comprise three loops 11, 12 and 13 in series (Fig. 4a) and b; or three separate coils. The rod may be grown downwards (as shown) or upwards. |
