Cold wall furnaces / Vacuum furnaces

Cold wall furnaces or vacuum furnaces are furnaces in which a gas-tight, pressure-resistant housing encloses the heating conductor and working chamber, while at the same time the wall is cooled to ensure the strength.

Usually these are vacuum or high-pressure furnaces with heaters made of graphite or refractory metals such as tungsten or molybdenum. Tube furnaces of type LORA-G can also be assigned to this furnace class.

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Cold wall high vacuum furnaces with tungsten heater

Thanks to the exclusive use of shielding plates for thermal insulation and ventilation with dry inert gas, cold-wall high-vacuum furnaces with tungsten heaters are characterized by good vacuum, short pump-down times and fast cooling times.

Short description:

Temperatures up to 2500 °C
Atmospheres: inert or vacuum
Working area diameter: approx. 100 to 300 mm
Heated height: 200 to 400 mm
Achievable pressure: 1 x 10-6 mbar
Power range: 10 to 100 kW
Temperature measurement with pyrometer or thermocouple type C (up to 2200 °C

Heating system:

Single-zoned

Charging:

Top loader
Lift-bottom furnaces

Equipment features:

Complex control unit with PC interface for furnace,
vacuum generation, inert gas inlet and sample movement
Software for control unit
Movable sample thermocouples
Observation window
Crucibles and boats
Rotating sample stages
Protective gas system with pressure relief valve for operation as
protective gas furnace

Applications:

Physical experiments
Solid state chemical analyses
Melting/alloys
Sintering
Recrystallization (W-coils in lamp production)
Vacuum tempering

Cold wall high pressure furnaces

The furnace type cold wall high pressure furnace combines a pressure-resistant cooled wall with a metal heater. Materials are used for insulation, which make heat exchange by convection particularly difficult.