SU762256A1 - Device for growing shaped crystal - Google Patents

Description

The invention relates to a technology for producing profiled single crystals, in particular, to a technology for producing profiled sapphire.

Known devices for producing shaped crystals. All of them contain a container with a melt in which the former is installed, the shape of which corresponds to the shape of the grown crystal. For example, according to the method of A.V. Stepanov in the melt immerse the screen with a profile gap or on the surface of the melt float filler. In the practice of growing crystals, this solution has not spread *, since the level of the melt decreases in the crystallization process and, therefore, the position of the crystallization front, which must be maintained unchanged in order to maintain stable crystal forms and properties.

The closest technical solution is a device for growing a crystal on a tubular seed, including a crucible with a lid, a shaper installed in it, containing a shaping element with a hole in the center for perching and capillaries For feeding the melt during growth, and a pull mechanism. Shaper passes through the entire crucible. . The disadvantages of such a device: ·

- when deforming the edge of the former, all the accessories fail and are not subject to recovery;

- to change the size or shape of the grown crystal it is necessary to change the entire snap.

These shortcomings are very significant since the deformation of the forming edge can occur at the very first crystallization due to crushing of the edge with a seed crystal, chipping of the former, and precipitation of the resulting crystals from it.

The aim of the invention is to increase the service life and the possibility of growing crystals of different profiles.

This goal is achieved by the fact that the capillaries are made in the form of separate tubes assembled in a bundle,

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• and the forming element is made in the form of a removable nozzle mounted on top of it and having a through slot inside, the shape of which corresponds to the shape of the grown crystal. ’·· ..

. Fig, 1 shows a general view.

The proposed device ^ in FIG. 2 6 shows options for removable attachments for growing crystals of various profiles: FIG. 2 - in, in the form of round pipes ’, FIG. 3 - in the form of a triangular. prisms, FIG. 4 - in the form of a tetrahedral profile *, in FIG. "5 - in the form of a tape ^

15 of FIG. 6 - in the form of hex pro., For,

• The device consists of a crucible 1c with a lid 2, in which is installed a puck of 3 capillaries. The end of the capillary bundle is removed from the crucible and on it is mounted nozzle 4, which serves as a shaping element. The nozzle 4 consists of an inner and an outer 25 parts with a slot, the shape of which corresponds to the shape of the grown crystal, and in the center of the nozzle there is a hole 5 for persecution.

30 The device operates as follows. Through the holes in the cover 2 in the crucible 1 load raw materials. After melting the raw material and filling the capillaries 3, the seed crystal is fed to the hole 5 of the nozzle $ and

35 melt it. The build-up is necessary in order to melt the capillary of the attachment 4 with the capillaries of bundle • ka 3. Then turn on the suction device and grow the crystal

⁴ θ in a known manner. The shape of the grown crystal is determined by the shape of the nozzle 4. When the nozzle is deformed, it is removed by a slight side impact (the nozzle is held by a layer of solidified melt several microns thick) or (at considerable nozzle sizes) the temperature of the device is frozen until the crystal freezes to the nozzle, after which it is raised

50ι pulling device with crystal.

The advantages of the proposed device include the possibility 55 of obtaining profiles of complex cross sections (for example, Archimedes spirals), which cannot be grown in known devices, since capillary systems

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3

It is technically impossible to manufacture such complex shapes, while a nozzle, which is several millimeters high, is quite simple to perform.

762256

The proposed device allows more than 4 times to increase the service life of the shaper and reduce the consumption of refractory materials.

₅ lov on his Manufacture.

FIG. B

Claims (1)

A DEVICE FOR CULTIVATION OF PROFILEED CRYSTALS, including a crucible with a lid, a shaper set in it, containing forming element with a hole in the center for seeding and capillaries for feeding the melt during growth, and a mechanism for pulling, characterized in that in order to increase the service life and the possibility of growing crystals of different profiles, the capillaries are made in the form of separate tubes assembled , and the forming element is designed as a removable nozzle mounted on top of it and having a through slot inside, the shape of which corresponds to the shape of the grown crystal. 1 I