INSULATING-BASE HEATER MANUFACTURING PROCESS Russian patent published in 1997 - IPC

FIELD: electrical engineering. SUBSTANCE: charge mix of the following composition is prepared, mass percent: vermiculite - 65-68; liquid glass 25-31; sodium fluosilicate - 3-8; first layer of heater briquet is molded and metal heating element is installed by means of template. Thickness of molded layer is half the thickness of heater briquet and amounts to 10 mm. Compression ratio of mold used for the purpose is 2-5. Template has thin profile section enabling its easy extraction from ceramic mass upon charging second layer so that metal heater leads remain inside ceramic mass. Then template is removed and second layer is molded under same conditions. EFFECT: improved output, reduced cost of process and finished products. 2 dwg