L&L SPECIAL FURNACE CO., INC.: Electrical Box Retort Furnace
The furnace has a temperature uniformity of ± 20°F at 1,100°F using six zones of temperature control with biasing to balance any temperature gradients.
L&L Special Furnace Co., Inc. recently announced that it has received an order for a large retort box furnace used for de-bindering ceramic composite pre-peg materials, along with powder metals processing and hot isostatic processing. The main function of the furnace is to remove all organics and other materials used in the product prior to being placed in a high-fire vacuum chamber. This de-bindering process is extremely important and allows for a strong, lightweight finished product.
The XLC3648 has a work zone of 29 in. wide by 29 in. high by 35 in. deep. It has a temperature uniformity of ± 20°F at 1,100°F using six zones of temperature control with biasing to balance any temperature gradients.
The furnace is constructed of low-mass insulation that reportedly allows for quicker cooldown times. It has a venturi cooling blower that also aids in cooling, and it is controlled by a Eurotherm program control with over-temperature protection. There is also a programmable flow panel to manage the nitrogen flow throughout the process.
The parts are ceramic matrix composites (CMCs), which are a series of ceramic threads that are bound together and woven by a 3D printing system. These parts can be made into very intricate aircraft sub-assemblies for the smaller units, as well as large engine parts.
The parts are heated to 1,220°F in a retort chamber that is pressurized with nitrogen. The byproducts of the outgassing part are directed by pressure and flow out of the rear of the furnace. After de-bindering, the parts are then heated in a vacuum furnace to temperatures in excess of 2,300°F. The result is a super-strong component that is more resilient and lighter than titanium.
For additional information, visit www.llfurnace.com.