L&L commissions high-temp box furnace for ceramic composite parts

The GHH series box furnace for ceramic matrix composite. (Courtesy: L&L Special Furnace Company)

L&L Special Furnace Company, Inc. has shipped and commissioned a large high-temperature box furnace to a Midwestern U.S. plant starting production on ceramic matrix parts that will be used in military and aerospace applications.

The L&L GHH3350 has an effective work zone of 32” wide by 30” high by 50” deep. The furnace is capable of reaching temperatures up to 1,700°C / 3,100°F under partial atmospheric pressure. There is also a vacuum pump to help remove oxygen prior to beginning the thermal cycle.

The front-loading box furnace is insulated with multi-layer, high-temperature insulation. The floor is reinforced and includes a composite hearth capable of supporting load weights up to 500 pounds.

The GHH3350 is heated with molybdenum disilicide elements located on the side walls and back. It is controlled by a Eurotherm program control with overtemperature protection and includes a multi-pen chart recorder with 36 inputs to record various temperatures, flow rates, and pressures.

The case is sealed for use with inert atmosphere. It includes an automated flow panel, type B thermocouples, and a stack light audible visual annunciator system. The furnace has an afterburner or scrubber to remove any contaminants prior to evacuation from the furnace.

All L&L furnaces can be configured with various options and be specifically tailored to meet customers’ thermal needs. L&L also offers furnaces equipped with pyrometry packages to meet ASM2750.

Options include a variety of control and recorder configurations. A three-day, all-inclusive startup service is included with each system within the continental U.S. and Canada. International startup and training service is available by factory quote.

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