Vacuum/Gas Rotary Tube Furnace:

This graphite tube furnace can be operated in both a horizontal and vertical position, and is designed for operating temperatures to 3000C. Common applications include annealing, brazing, ceramic firing, degassing, graphitizing, melting and sintering. An optional muffle tube is available for processing in an oxidizing environment up to 1750C.

Chamber and hot zone
Vacuum and gas system
Power supply & controls
Water cooling
Furnace mounting system
Utilities

Chamber and hot zone

The furnace chamber is double walled, cylindrical, water cooled, stainless steel and polished. Two top and bottom access lids are made from water-cooled brass and then nickel plated. The three power feed throughs are nickel-plated copper and water cooled. There are two instrument feed through ports for the TC's and 2 gas-ported quartz sight windows for viewing. Loading is done horizontally, optional retort in place, through an access lid with the end cap removed.

The hot zone usable uniform work area is 6.0x12.0" (150x300 mm). Temperature uniformity is better than +/-10^oC over the load area in vacuum above 800^oC. The Graphite hot zone consists of a 8.0 x 16.0" (200mm x 400mm) Graphite heating element and fibrous graphite insulation.

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Vacuum & Gas system

The Vacuum System allows for operation in the 10^-2 Torr by means of a two stage Rotary Vane pump. Other components supplied for the operation of the vacuum system are a vacuum gauge controller with vacuum gauge, electro-pneumatic vacuum valve, vacuum air release and leak check valves.

The inert gas system allows for operation in Argon, Nitrogen, Helium, or forming gas. The
standard positive pressure for operation is 2 PSIG (0.14 Bar). A relief valve and a 30/30 compound gauge (30 PSIG x 30in. Hg) are located on the vacuum chamber.

As an option a Flow Adapter Kit for continuous flow with (2) gas windows for use in a horizontal configuration is available

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Power Supply & Controls

The power supply consists of a three phase, SCR controlled transformer package capable of ramping the furnace up to 3000^oC. All circuit breakers, contactors, auxiliary transformer, instruments and Volt & amp meters are cased in a single cabinet to reduce floor space.

Temperature Measurement & Control is accomplished by a total of two sheathed and coated type "C" thermocouples, and a two-color pyrometer.

A Eurotherm programmable controller is supplied to control the hot zone temperature with the
retractable TC and pyrometer. A temperature setpoint will trigger the control switchover to the pyrometer and retract the thermocouple to protect it from over-heating.

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Water Cooling

A water manifold supplies cooling water to the various parts of the furnace including the main chamber, power cables, cooling plates, copper power feed through etc. A series of flow control
valves are supplied to control the water flow to each circuit. A water flow switch is included and in the event that water flow is interrupted for more than 5 seconds, the furnace power will
automatically be switched off.

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Furnace mounting

Furnace Support: The furnace chamber can be rotated so that it may operate in the vertical or horizontal position. The furnace unit will be mounted on the right side on the control console/power supply. The console will be capable of supporting the entire furnace chamber, hot zone, vacuum system, water manifold, and gas manifold.

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Utilities

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