Ceramics Company Buys High Temperature Furnace

“L&L Special Furnace Co., Inc. has shipped a floorstanding, hightemperature silicon carbide furnace to a leading worldwide supplier of hightemperature piezo ceramics used in the military, aerospace and medical fields.

The L&L model GLF836 has an effective work zone of 18” wide by 18” high by 36” deep. The furnace has a double pivot horizontal door. It is used for processing glass products to 2,500°F / 1,371°C. This process causes lead to outgas from the process. The furnace interior is constructed from highalumina refractory with less silica than normal linings, which helps delay the corrosive reaction between the silica present in the refractory and the lead outgassing at elevated temperatures. There is also a removable layer of recrystallized alumina fiber board in the hot zone. This sacrificial highalumina board can be removed and easily replaced, which helps maintain the furnace chamber integrity.

The furnace is powered by highdensity, siliconcarbide elements located above and below the furnace hearth. It is controlled by a SOLO singleset point control with overtemperature protection. A tap transformer is included with multiple taps to adjust the primary element voltage as needed as the heating elements change in resistance. A SCR power control with soft start regulates the output voltage to the elements.

The model GLF836 features a freestanding NEMA12 control panel with fused disconnect, and Type R thermocouple for instrumentation. The furnace is also constructed to NFPA86 guidelines for safety.”

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