Method of producing dark heater

Details Method of producing dark heater Method of producing dark heater

1986-05-19

1989-07-04

Bell, Janyce

Coating processes

Electrical product produced

Filament for lamp or tube

427118, 427120, 427123, 4271263, 4271264, 4273722, 4273837, 427404, 4274192, 427435, 427437, B05D 512

Patent

active

048449423

ABSTRACT:
A dark heater is produced by a method which comprises coating the first coating layer made of an insulating material with a suspension containing heat-resistant particles having a high thermal emissivity, such as W particles, while 0.5 to 1.5 wt. % of a volatile matter such as water remains in the first coating layer to form a dark coating layer. Since the suspension having a low viscosity can be used, the thickness of the dark coating layer can be made highly uniform and the emission characteristics of the heater can be stabilized.

REFERENCES:
patent: 3691421 (1972-09-01), Decker et al.
patent: 3808043 (1974-04-01), Hale et al.
patent: 3852105 (1974-12-01), Hale
patent: 4126489 (1978-11-01), Williams

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