Machines for growingof leucosapphire monocrystal based on horizontally directed crystallization method

This facility is designed to grow leucosapphire monocrystals of any crystallographic orientation of plates. This method enables to produce leucosapphire monocrystals of record dimensions impossible to obtain by other growing methods.
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Description
Specifications

Horizontally directed crystallization method (Bagdasarov’s method) was developed by the Shubnikov A.I.Institute of crystallography.


This method comprises elements of directed crystallization and floating-zone melting. Unlike the standard melting method that involves the entire volume of the raw material, the HDC creates a locally melted area between the seed crystal and raw material. The crystal growth is ensured by slow travel of the melted area along the boat-shaped container with material.


The HDC method is characterized by possible multiple re-crystallization of material that contributes to the cleansing of the raw material and thus enhancing the crystal quality. Open surface of the hot melt allows to apply additives at any stage of crystal growing.


The machines are equipped with an advanced control system that measures relevant values of the current, voltage and power of the heater, controls pressure inside the operating chamber and roughing line, as well as that of the rod and chamber travel, measures the temperature and flowrate of the cooling water in each loop, sends alarm signals etc.


The “NPO “GKMP” LLC provides machines to grow leucosapphire crystals and other materials using the HDC method.

Benefits of the HDC leucosapphire crystal growing machines produced by the “NPO “GKMP” LLC

  • Possibility to install few independent heaters to create and control temperature gradient.
  • Light facing to decrease response time of the thermal assembly.
  • Possible application of tungsten boats in order to prevent the crystal from UV exposure.
Property Meaning

Crystal growing method

HDC (Bagdasarov)

Operating chamber dimensions (L * W * H), mm

1500 * 1000 * 900

Operating pressure inside the chamber, torr

5*10-5

Chamber material

12Х18Н10Т

Operatingtravelspeedofthe boat, mm/h

0.1 - 20

Rodpositioningtolerance,mm

0.1

Rod stroke, mm

600

Gatechambertravelspeed, mm/min

100

Gatechamberrotationangle, degrees

90

Chambertravelspeed, mm

180

Heating method

Resistive

Heater material

Tungsten

Heater power, kW

Up to 40

TV camera

On request

Pyrometer and thermocouples

On request

Coolingwaterflowrate, m3/h, not to exceed

6

Dimensions (L * W * H), mm

2400 * 1600 * 1800

Mass, kg

1600

Power supply parameters

3*(380±38) +N

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