High Temperature Furnaces With SIC Heating Elements

High Temperature Furnaces With SIC Heating Elements

Furnaces heated by SIC or MoSi₂ Heating Elements Furnaces from 1400° C to 1550°C are mostly equipped with SiC heating elements. Because of the atypical temperature-resistance characteristics of them, it has always been difficult to control the temperature during heating phase. When temperature raises, resistance of SiC elements decreases, which is an extraordinary behavior compared to conventional heating elements. Therefore it is very important and complicated to find the right voltage value for the control units.

SIC heating elements have also an aging disadvantage. Thermal shocks are accelerating the aging of the SiC heating element. Because of this reason it’s not the right way to use the on/off control method on the SiC heating elements. To find the best solution for this handicap, it’s suggested to use the widely known “Phase Angle Firing Method”. Instead of periodically "full power" supplying, this method allows "required power" supplying continuously. This way, thermal shocks are eliminated.

SIC heating elements manufacturers suggest several methods for the control. For example: Voltage control method, current control with limitation method etc. The most advanced suggestion is power output control method. MagmaTherm engineers have decided to achieve more than manufacturers suggestions. Our furnaces are equipped with “Power output” and “Current Limitation” control method together. With this decision, it has been possible to both control the temperature and secure the electrical hardware and cabling against high current damage.

For the furnaces from 1500° C to 1800°C equipped with MoSi2 heating elements, MagmaTherm uses the same “advanced control and drive” method. It has been ensured minimum thermal shocks and long operating life for these heating elements.

• • User friendly operating menu in 4 line display for easy operation.
• • Using phase angle firingmethod for slowing down the inevitable aging of SIC heating elements.
• • High cold start heating rate.
• • Own unique electronic design and software's.
• • Current limit control for safe operation.
• • Durable inside lining made of high quality light insulating bricks and ceramic fiber boards.
• • Accurate temperature measuring and controlling using S Type thermocouples.
• • Designed for minimal space requirements in the laboratory thanks to highly engineered insulation design.
• • Dual shell housing for low outer surface temperature.
• • Optional protective gas connection, door switch.
• • Lift up and Side words opening door possibilities.
• • ±1 °C control accuracy.