Materials Research Furnaces, Inc

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 0.3 CuFt Heat Treating Furnace

General specifications:
  • Up to 2200C
  • Hydrogen, Inert gas or vacuum Atmosphere
  • Diffusion pumping system
  • Tungsten Mesh heating elements
  • 4" x 6 " x 8" usable hot zone
  • Excellent temperature uniformity
  • Hydrogen wetting system with dewpoint control option
  • other options and add-ons available
Heat treat furnace
0.3 Cu Ft Heat treating furnace

Our small heat treating furnace contains a 0.3 cubic foot usable zone capable of temperatures up to 2200C and can be equipped with many options. The unit shown here features a hydrogen wetting system with dewpoint control, and a 6" diffusion pumping system. Other options are available. The hot zone features tungsten mesh heating elements, providing excellent uniformity and longivity. This furnace comes equipped with an intuitive control panel, allowing full control of the furnace. Our optional PC control package provides aditional features such as data trends and storage ( Data acquisition), display and logging of alarms, unlimited recipe profiles temperature control, security, etc. This furnace is suitable for both R&D and as a batch furnace for production.


Major parts:
  1. Chamber and hot zone
  2. Power supply & controls
  3. Vacuum system
  4. Gas system
  5. Water cooling
  6. Utilities

 

Chamber and hot zone

The chamber is loaded from the front and contains a Hot Zone with a 6" x 8" x 10" usable zone and a +/- 10C temperature gradient. The heating element is comprized of 2 identical tungsten mesh panels, heating both sized of the load, and feature excellent uniformity and longivity. The furnace chamber is manufactured from doubled-walled stainless steel welded together and polished for a clean finish and good vacuum integrity. Plenty of ports are incorporated for auxliary equipment and sensors. The hot zone shields are mounted in a chamber frame, allowing for the thermal growth of the zone during the heat cycling.
The furnace load is placed on the load frame. The load frame supports are engineered to feature a high load capacity and a low thermal conductivity loss to the chamber walls.

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Power Supply & controls

Power to the hot zone is supplied by a Three Phase SCR controlled power supply, including a circuit breaker, a contactor, an SCR to modulate the power to the hot zone, a main stepdown transformer matched to meet the heating element resistance, Volt and Amp Meters, and a set of water-cooled power cables to supply power to the furnace.

Two control options are available, a control panel with switches, lights, temperature controller and vacuum instrument, or a Computer Interface package with HMI software and Industrial touchpanel PC. Both offer full control of the furnace and are easy to operate. The Computer package adds data acquisition, alarms, recipe storage, security and networking.

With the control panel option, you get panels, lights, and major brand controllers for the temperature, gas, and vacuum system. A silkscreen provides a graphical representation of the furnace and allows the user to quickly observ, follow, and control the condition of the furnace.

Control panel sample
Control panel sample

If optioning for the computer package, the PLC is used to control temperature, and other system components such as vacuum and gas. Since the instrument reads and controls temperature and pressure, other instruments can be eliminated thus simplifying operation and configuration.The controller interfaces with the PC and transmits the temperature,power and vacuum readings. This instrument also controls all digital logic required to control the solenoid valves, motor starters, interlocks, gas system, and vacuum system. HMI image sample
HMI Sample screen

A type "C" sheathed and coated thermocouple is supplied and can be used to measure the furnace temperature up to 2300C. When operating the furnace to temperatures above 2000 o C, an safety over-temperature controller will shut of power to the hot zone.

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Vacuum System

Many differrent vacuum systems are available on this system, depending on the atmospheric requirements:

  • The basic system, an evacuation system, consists of a Rotary Vane mechanical pump, an electro-pneumatic
    vacuum valve, and vacuum gauge. This vacuum system will allow for operation in a vacuum environment (10-2 to 10-3 Torr range).
  • A 4" or 6" diffusion pumping system can be provided as well to achieve vacuum levels down to 10-6 Torr. All our diff pump systems include a refrigerated cold trap to prevent oil backstreaming and to obtain a lower ultimate vacuum.
  • A turbo pumping system or cryo pumping system can be provided with a "dry" roughing pump to provide an oil-less vacuum system for ultra clean environments and to obtain a vacuum level of 10-7 to 10-8 Torr range.

For more information on our vacuum systems, please visit our technical page.

Gas System

An inert or Hydrogen gas system can be supplied to provide an inert or reducing environment for the work samples during the heat testing. The process Gas System (Argon): includes solenoid-operated inlet valve, a Compound Gauge (30 P.S.I.G. x 30 in. Hg.), a gas flow meter, and a 2 P.S.I.G. outlet relief valve to maintain a positive pressure. There is also a 5 P.S.I.G. over-pressure safety relief valve. For operation in Hydrogen, additional solenoids and sensors are supplied to provide safe and reliable operation. A burn-off kit will burn and monitor any flammable gas exiting the furnace, a safety blow-off port is provided to relieve any excessive chamber pressure. The featured furnace also has a hydrogen dewpoint generator system, producing a controlled amount of wet hydrogen for the process requirements.

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Water cooling system

The Furnace Water cooling manifold consists of multiple circuits to adequately cool all the furnace parts and includes a strainer, pressure regulator, pressure gauge, water inlet and outlet manifold, a water flow switch as a visual water flow indicator with a flow interlock to protect the furnace in the event of a water flow failure. This switch turns off power to the hot zone contactor if water flow is below recommended minimum for a certain amount of time. Each part of the furnace is supplied with a separate cooling circuit that can be regulated by independent manual ball valves.

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Utilities

Power: 45 KVA, 380-480-575 V/3/50-60 Hz
Water: 8 G.P.M. @ 60 o F and 50 P.S.I.G.
Process Gas: Argon or Nitrogen, Hydrogen 40 L.P.M. @ 50 P.S.I.G.
Compressed Air: 60-90 P.S.I.G. filtered.

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