System Description

The high temperature furnace consists of 6 molybdenum disilicide hairpin heating elements (I2R Moly-D ®) vertically suspended inside an insulation package made from vacuum formed 1800oC high density fiber. A hearth pedestal made from 1760oC insulating firebrick (BNZ 3200 IFB ®) is provided to hold the crucible accurately in the center of the hot zone; the crucible may be as large as 15 cm diameter by 17.5 cm high. Power to the elements is provided by a 7.5 kVA transformer mounted in the base of the furnace support frame, regulated via a solid state relay. Control feedback is provided by a type B platinum/rhodium thermocouple for long life at high service temperature. 

The footprint of the GMF-1700 is 69 cm x 69 cm; the height is 210 cm with the overhead stirring motor attached and 160 cm without. The total mass of the furnace and controller is 200 kg. The support frame is constructed of 6061-T6 aluminum coated with an attractive combination of durable clear anodized and black powder coat finishes. All fasteners are stainless steel, providing additional contrast that is both aesthetic and functional. Also the support frame assembly is equipped with adjustable feet for leveling the furnace on any floor. 

Electrical service requirements are quite modest at 7.5 kVA 230 volt 50/60 Hz single phase, though a 50 A breaker is recommended. One separate outlet is required for operation of the stirring motor, though this may optionally be included in the back panel of the control module upon request. 


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