NIKA series automated crystal growing machines is the key element of crystal Rostox-N growing technology.  

The crystal growing system NIKA-Profile developed by Rostox-N jointly with EZAN is designed for industrial production of shaped sapphire crystals by EFG/Stepanov method. The equipment is built on the basis of the up-to-date mechanics and electronics, distributed systems for data acquisition and processing. High-stable IGBT converter with output power  of up to 100 kW provides the induction heating of a hot zone. The automated process control system provides through automation of the process inclding automatic seeding. The program module of the technological data collection and processing after a crystal growth allows effective optimization of technological processes.


Nika-Profile General View

Nika-Profile CAD Drawing, General View.


Crystal Growing Unit

  • Melting temperature:  up to 2200О С
  • Crucible diameter:  up to 250 mm
  • Crystal weight:  up to 5 / 10 kg
  • Weight sensor range: up to 5 / 10 kg
  • Weight sensor sensitivity:  min 0.02 / 0.04 g
  • Inert gas pressure in chamber:  max. 1,5x105Pa

Transistor (IGBT) Converter.

  • Type of converter: transistor (IGBT)
  • Max output power: 100 kW
  • Output frequency   5 - 20 kHz
  • Output voltage: 0 – 450 V
  • Coefficient of efficiency: > 0,95
  • Output power control range: 1 - 100 кW (0.0015 kW step)
  • Output power stability: +/- 0,05%

 Adaptive Automated Control System (ACS)

The adaptive (self-adjusting) ACS provides the control and stability through the whole growth process including the seeding. The significant advantage of the ACS is availability of several classes of automatic regulators, such as self-adjusting PID-regulator, incremental regulator, self-adjusting predictor-corrector which, as the practice has shown, provides for the best quality of a crystal shape control.