Small Bell Jar Arc Melt Furnace MODEL ABJ-338 Our small bell jar arc melt furnace is a compact turn-key system and provides a cost saving alternative to resistance and induction furnaces. It is simple to operate, extremely reliable and has a low acquisition and operating cost. The furnace can instantly reach temperatures over 3500ºC, and will cool down to room temperature in minutes. MRF will provide custom melt cavities in the hearth plate at the customer’s request. The many available options such as load locks, splat rod, crystal growing kit, high vacuum systems, etc, make this furnace versatile and adaptable. MRF Model ABJ-338 Bell Jar Arc Melting Vacuum Furnace specifications: • • • • • • • • • • • • • Operating temperature: over 3500ºC. Small Bell Jar hinged loading configuration. 100% 304L grade stainless steel vacuum chamber construction. Copper stinger with tungsten electrode. Custom copper hearth plate 3.38” dia. (85mm dia.) arrangement. Sight window with 2.75" dia. viewport. One illumination port with halogen light. Power supply: 400 Amp @ 60% Duty Cycle, 35 kVA. Power cables 1.8 meters long, water-cooled. Pressure relief port. Water safety interlock. Inert gas system. Pumping system with roughing pump, vacuum gauge and valve. Common Applications: • • • • Powder melting Creating alloys Metallic buttons Arc Casting Annealing Crucible welding Material densification

Major system Components: 1. Furnace Chamber: n The chamber is all 304L grade stainless steel and electro-polished. n The chamber is double-walled for water cooling to maintain a chamber temperature below 50ºC (120ºF) during normal use. n The chamber is rated for vacuum to 10-6 Torr (mbar) n Access to the furnace for loading and unloading is through the hinged bell jar cover. n One illumination port with halogen light is provided. n The port for a pumping system is located on the bottom of the chamber. n Clamps are provided to seal the chamber and isolate the chamber atmosphere. Bell jar chamber...

3. Hearth Plate: n The hearth plate is copper and water-cooled. n Dimensions: 3.375” (84mm) diameter x .62" (16mm) thick. n Custom cavities in the hearth plate are provided at no charge. 4. Inert Gas System : n This furnace system was designed to operate in argon, nitrogen, or non-flammable forming gas. n A pump-out followed by a gas backfill provides a fast way to remove all oxygen from the chamber. n The standard positive pressure for operation is .14 kg/cm sq (2 PSIG). n A relief valve and a 30/30 compound gauge (30 PSIG x 30 in. Hg) are located on the chamber. 5. Vacuum System: n n n n A...

10. Documentation: Two sets of Installation and Operating Instructions, Component Manuals and Assembly Drawings are included with the equipment - one hardcopy, one copy on CD. 11. Options & Accessories • • • Load Lock Splat Rod Crystal Growing Kit Diffusion or Turbo Vacuum System Rotating Hearth High Frequency Arc-Starter Utilities n Electricity: 35 kVA, 230/240/380/460V*, three phase, 50-60 Hz. n Water: 3 GPM flow, inlet temperature (68ºF) 20ºC at 40 PSI (3.5 kg/cm2). n Gas: argon, nitrogen or non-flammable forming gas, plant or bottle supply @ 40 PSI (3.5 kg/cm2). * NOTE: Some voltages may...