FIELD: electrical engineering, applicable at application of the current-conducting film onto the surfaces of electric heaters.
SUBSTANCE: a protective film of aluminium trifluoride is additionally applied onto the current-conducting film of stannic oxide alloyed by antimory and boron with a subsequent allowance in the air during 40÷60 min, after that a thermal treatment is conducted at a temperature of(500÷600)°C for 2÷3 hours.
EFFECT: enhanced durability of electric heater operation.
10 cl, 3 dwg
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