This furnace can reach up to 1100° C max temperature where the continuous operating temperature is 1000° C. A differential control unit applies a ramp control for the furnace. The furnace can be designed to operate in different temperature zones with single zone, double zone and triple zone options. An individual thermocouple is implemented for each zone so each zone can independently operate in different temperatures. The inlet and outlet of the furnace are designed to fit the shape and volume of the material to be heated. The diameter, height and posture (horizontal or vertical) of the furnace can be designed and manufactured in accordance with the user requirements.