Bottom Loading Metal Hot Zone Furnace


High Temperature High Vacuum or Controlled Atmosphere, Bottom Loading, Cold Wall, Refractory Metal Heat Zone Furnaces.

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17 SERIES Metal Hot Zone Furnace

The Series 17 High Temperature High Vacuum or Controlled Atmosphere, Bottom Loading, Cold Wall, Refractory Metal Heat Zone Furnaces are simple and easy to operate.

A Furnace System typically consists of the Basic Furnace Chamber Assembly, the High Vacuum System or Evacuation System, the Process Gas System, the Power Supply, the Temperature Control Instrumentation, and the Furnace Mounting System.


  • Low initial cost
  • Efficient, inexpensive to use
  • Uncomplicated design, easy to operate.
  • Clean, compact, vacuum-tight construction.
  • Use in vacuum, inert, nitrogen, atmosphere.
  • Low thermal mass—rapid heating and cooling.
  • Accurate and uniform temperature control


3" Dia. x 4" to 12" High Up to 1000°C
4" Dia. x 5" to 18" High 1650°C
5" Dia. x 4" to 18" High 2000°C
6-1/2" Dia. x 8" to 20" High 2500°C
6-1/2" Dia. x 10" to 20" High 2750°C
8" Dia. x 10" to 24" High 3000°C
10" Dia. x 12" to 24" High PRESSURE VACUUM: 2 PSIG to 10-6 Torr
14" Dia. x 12" to 24" High

These Furnaces can be built having Heat Zone sizes of 3" dia. x 4" high to 14" dia. x 24" high, and capable of operating up to 3000°C. It is possible to operate in High Vacuum, in Inert Gas, in Reducing or in Oxidizing Atmospheres. The Vacuum System is capable of attaining 10-6 torr. The Furnace Chamber may be backfilled to 2 PSIG.

The Furnace is mounted on an open frame with the Vacuum System immediately behind (or to one side) for maximum efficiency. The Power Supply and Control Console are also located as close as possible to the Furnace Chamber. (In the case of small systems, the power supply is housed inside the control console).

The Unit is ready to operate as soon as power is connected to the main circuit breaker, and water inlet and drain connections are made.

The Furnace is completely assembled and thoroughly tested prior to shipping. A copy of test results will accompany shipment.

Applications & General Information

  • Brazing
  • Heat Treating
  • Crystal Growth
  • Melting
  • Ceramic Firing
  • Sintering
  • Degassing
  • Thermocouple Calibration.



The Basic Furnace consists of a double wall all stainless Steel (304L), water-jacketed chamber inside of which is The Heat Zone. The heat zone is resistance heated. The Heating Element is made of Refractory Metal (or Kanthal A). The Heat Shields are also all Metal. Heat zone Components are easily accessible for inspection or maintenance. A Hearth is provided for work support. The entire inside of the furnace chamber is designed to Conform to the best High Vacuum Practice. Particular attention is given to the choice of heat zone materials and to surface finishes. Ports are provided for Sighting, Thermocouples, Evacuation, Inert Gas Inlet and exit, Gauges, etc. Centorr Vacuum Industries’ proprietary Rotatable Sight Window is included as standard equipment.

Loading is done by means of the remotely operated Furnace Base. Work is placed on top of the hearth and Raised up into the heat zone. Clamps are provided for Operation to slightly above ambient pressure.


Standard High Vacuum Systems consist of High Vacuum Elbow; Diffusion Pump with Cold Trap; Mechanical Pump; Manual, Semi-Automatic, or Fully Automatic Valve System; all Copper Manifold; Viton "O" rings; and Combination Ion Gauge & Two-Station T.C. Gauge Vacuum Instrument.


Process Gas System consists of Vacuum-Tight Gas Inlet Valve and Relief Valve, Bourdon type Pressure Vacuum Gauge and Manifold.


Power Supply System consists of Silicon Controlled Rectifier Power Controller (Saturable Core Reactors also available) with Current Limit, Stepdown Transformer, Ammeter, Voltmeter, Push Buttons, Indicator Lights, Water Interlocks, all completely wired and packaged in an attractive floor standing cabinet.

Utility requirements are given in KVA at customer's Primary Voltage, Single or Three Phase, and 50 or 60 Hertz.


Centorr/Vacuum Industries can supply from the simplest Manual Power Control to the most elaborate Instrumentation. This can include Automatic closed loop control utilizing Thermocouples, Power Transducers, or Optical Pyrometers for sensing; and incorporating Indicator-Controllers, Recorders, and Programmers. Various types of Micro-Processor Programmers are now available and extremely popular.


The Furnace Chamber is mounted on an open support frame. Legs are provided with Leveling Pads.


For operation in the 10-50 Microns range of vacuum or for evacuation prior to backfilling with Inert Gas or Nitrogen, we include an Evacuation System. This includes a Mechanical Vacuum Pump, Vacuum Valve, and Manifold. Line Filter ahead of the vacuum pump, and Thermocouple type Vacuum Instrument are optionally available.

Centorr Vacuum Industries specializes in challenging custom-designed vacuum furnace and controlled atmosphere furnace solutions for a variety of difficult thermal processes. Learn More