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Wire Annealing furnace
This wire annealing furnace has four open ended tubes to feed wires and features a hydrogen gas system that applies pressure differentials to prevent hydrogen from entering the environment. A unique temperature gradient zone is mounted on either side of the high uniformity hot zone, capable of maintaining operating temperatures of 2500C. Chamber and hot zoneThe chamber is designed to accommodate four feeding wires. The wires will pass first through four (4) stainless steel guide tubes located at the top and then through four (4) tungsten, gas fed tubes with a positive temperature gradient. After exiting this zone the wire will move into the higher (2500oC) temperature furnace. Once the wire has passed through this uniform temperature zone, the wire will enter the cooling zone at the bottom with a new temperature gradient. The furnace chamber is double walled and round-shaped and is fabricated with stainless steel. The furnace chamber is welded and polished. The Hot Zone is a round design using a Tungsten Mesh Heating Element and Tungsten & Molybdenum Refractory Shielding. The usable, uniform, +/-5oC hot zone is 2.75" ID X 20.0" long and is designed to easily reach a temperature of 2500oC. Water-cooled power feed throughs are supplied to bring power to the heating element. These power feed throughs are housed in a water-cooled power feed-through ring located on the top of the furnace. One gas ported, rotatable, quartz sight window is provided. This window will be in-line with at least one of the four tungsten guide tubes and is used for a pyrometer. There are several additional ports for gas inlet and alternate sight ports and thermocouples. On the side of the chamber is a hydrogen blow-off port. This spring loaded flanged disk is set at approximately 5 PSIG. Back to top Power supply and controlsTo provide power to the hot zone a Three Phase, SCR Power Controlled is supplied. This power supply and hot zone is designed to accommodate a high ramp rate to operating temperature in Hydrogen or Inert Gas to minimize startup times. All instruments, contactors, transformers and controllers are mounted in a single space saving enclosure. The main stepdown transformer to supply power to the heating elements has extra power and is provided with two voltage taps to match the element resistance as it ages. A set of water cooled power cables supplies the power to the heating elements from the main step down transformer. A set of Amp and Volt meters allows monitoring of the power usage. The furnace temperature is controlled by a Eurotherm digital and programmable temperature controller. Multiple temperature profiles can be stored to simplify running different processes. The temperature controller will use a two color pyrometer as the temperature measurement. Process gas systemThis furnace system was designed to operate in a combined Hydrogen & Inert Gas environment. The standard positive pressure in this furnace is 1/2-1 P.S.I.G. A relief valve and a compound gauge are located on the top of the furnace body. Gas Flow is controlled through a Mass Flow Controller and solenoid gas inlet valves with explosion proof pressure switches. A pressure differential system will keep hydrogen from flowing out from the wire feeding tubes while still maintaining a hydrogen environment internally and keep air from entering. All hydrogen is burned off externally with the hydrogen burn-off kit. Water cooling manifoldThe water manifold provided with this system is designed to adequately cool the furnace and power cables. To insure proper flow, a water flow switch will be installed with a light for visual indication. In the event water flow is disrupted for more than 5 seconds when the furnace is operating, power will be disconnected from the heating elements. The water manifold has several circuits supplying water to the various parts of the furnace. Each one of these can be manually adjusted to allow each circuit just the proper amount of flow to save water and allow a drain temperature of approximately 100F. Back to top Home Product Overview Spare parts |
