EDG Sunfire Crystal Growth Furnace

Inspired by the crystal growth industry and the flagship of Mellen’s furnace line, the Electro Dynamic Gradient (EDG) Sunfire Furnace System continues the research and development that has led to the advanced state of the art crystal growth equipment.

What are the advantages of an EDG Sunfire System?

Flat Zone: The EDG crystal growth furnace makes it possible to create a flat zone area inside the furnace. The flat zone (isothermal zone) is where all the required zones measure the same temperature. This creates an ideal environment for many applications. The temperature ranges controlled from 100°C to 1600°C and anywhere in between.

Controlled Gradient: The EDG allows the user to establish length of controlled temperature, or a gradient, between zones where the temperature varies a predetermined amount. Throughout the furnace, it is possible to have a temperature spike or a gradual increase/decrease of temperature.

Advanced Temperature Control: The EDG furnace system allows the operator uniform temperature control. A standard EDG has 24 zones, so with these numerous zones and power supply an operator can set and maintain a temperature. This constant setting allows for reliability and repeatability within a lab or production facility.

Computer Based Control Systems: The ADAPT™ temperature control system and data logger offers unprecedented control stability and real time data acquisition capabilities. It has the ability to control a furnace with a very high number of zones, or a large number of furnaces with just a few zones, thus giving the end user the ultimate in flexibility. User-friendly features include graphing, PIV tuning, programming control, and security features.

MELLEN Gradient Freeze Method

Best described as a combination or the Bridgman and Linear Gradient Freeze Technique, the MELLEN Gradient Freeze Method minimizes thermal stress and eliminates mechanical stress due to motion and vibration. This method may be used both horizontally and vertically and the furnace temperature profile is set up similar to the normal Bridgman profile approach.

There are five ways the MELLEN Gradient Freeze Method differs from other gradient freeze methods:

1. A flat zone across the ingot is established before, during, and after a gradient passage

2. Computer controlled linear movement of the interface

3. No moving parts or extraneous thermal currents

4. Utilizes quadrant tuning – localized or total

5. The span, slope, and the maximum temperature of the work is controlled over the full duration of the process


EDG Furnace System Options

  • EDG Sunfire System
  • EDG Omega Furnace
  • Gradient control within +/-.25°C per inch
  • Low cost multi-zone modular furnace with EDG capabilities
  • Mellen ADAPT System Software
  • Quadrant tuning
  • Sight glass
  • Split sections

The EDG System is a precision tool for research as well as production. There are a wide variety of applications available for the EDG precision furnace system. Wherever a need exists for precise applied gradients, this system can be applied.


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