Modernization of heater unit for the machine for growing sapphire single crystals by Kyropoulos method

Is actual for machines for growing crystals with mass more 60 kg
The main upgrade is to use a new type of heater.

Standard heater

Standard heater

Modernized heater NPK "Spectr"

Modernized heater

Advantages of the new heater:

Scheme of the upgraded heater NPK "Spectr"

  • absence of heating elements in the lower part of the heater unit (under the crucible);
  •  all tungsten rods are straight, there are no bent elements, which provides higher reliability of the heater (30 processes without a single breakdown), the total service life of the heater is doubled compared to the standard one;
  •  lower price, by reducing the number of tungsten rods, by lack of WRe wire and simplifying the manufacture of the heater;
  •  change in the temperature field, which is why there is a change in the axial and radial gradient in the melt. Reducing the axial gradient leads to an improved germination of the crystal cone. An increase in the radial gradient leads to a decrease in the sticking of the crystals.

After the modernization of the heater unit, we were able to control the shape of the crystallization front of the growing crystal. In certain periods of crystal growth, it was possible to change the heat dissipation from the rack.

Maximum heat dissipation

Maximum heat dissipation

Middle heat dissipation

Middle heat dissipation

Mainimum heat dissipation

Mainimum heat dissipation

Due to the controlled crystallization front it is possible to obtain practically defect-free crystals. Using our updated software, in which all operations during crystal growth are maximally automated, we achieved stable high results.

Modernization of the heater unit allowed us to obtain the following results:

  • reduction of power consumption of machine by 15-20%;
  • increase in yield of 15-30%;
  • reduction of operating costs due to increased reliability of the heater, its durability and cost reduction.
the end of the sapphire crystal growing process
the end of the sapphire crystal growing process

Other equipment and control systems NPK Spectr LLC

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    Parts made from metal granules using 3D printing or gas-static pressing are used for medicine (implants, medical wires, surgical instruments), for aviation (disks, shafts, shells, complex shapes).

  • Machine for enrichment of quartz concentrates

    The machine is designed for obtaining high-purity fractions of silicon dioxide SiO2 purity up to 99,9995 %. High-purity quartz is used for the production of materials and products for

  • Hydrofluoric acid

    Used for etching materials of the semiconductor industry (silicon and quartz wafers)