| 摘要 |
PURPOSE:To obtain a crystal having a cross section in which >=2 kinds of different-composition regions are concentrically arranged by arranging a cylindrical seed crystal with the axis horizontalized, supplying a molten material vertically to the axis while rotating the axis and retreating the seed crystal in the material supply direction. CONSTITUTION:A material hopper 9 and the mouthpiece of a gas burner 1 have a rectangular cross section, and the length of the long side is made larger than that of a desired crystal and the length of a seed crystal 6 held by a crystal holding part 11 is made larger than that of the crystal. The seed crystal is rotated on its axis by a crystal rotating mechanism 7. The crystal rotating speed is important and needs a wider variable range than the conventional Bernoulli device. A mechanism 8 for moving the crystal may be the same as the conventional one. The seed crystal rod is rotated on its horizontal long axis by this device, the surface is melted or almost melted by a flame, the molten material powders are deposited from the upper part, and the seed crystal is moved downward. |
