Electricity: electrical systems and devices – Igniting systems – For incandescent ignition
Patent
1976-02-17
1980-06-03
Yuen, Henry C.
Electricity: electrical systems and devices
Igniting systems
For incandescent ignition
219270, 431258, 431263, 431191, H01C 300
Patent
active
042064929
ABSTRACT:
An electric gas ignitor is disclosed having a gas igniting fiber comprising a core of conductive refractory material and an outer, high strength, oxidation resistant coating. One aspect of the invention concerns a primary current path defined by at least a portion of the fiber core and comprising a material having a highly uniform resistance per unit length. A substantially uniform temperature distribution is thereby promoted on the fiber surface and the formation of localized "hot spots" is inhibited. The primary current path is preferably an anisotropic material having a preferred crystal orientation which uniformly conducts electricity along the fiber length.
A second aspect of the invention is directed to the inclusion of a diffusion-barrier material between the fiber core and the oxidation-resistant coating to prevent diffusion of the core and coating, which changes the fiber operating temperature and decreases its operating life. The diffusion-barrier material is preferably refractory, closely packed, dense and, more perferably, is an anisotropic material having its preferred crystal orientation in a direction which inhibits the diffusion while forming the primary current path of the fiber.
REFERENCES:
patent: 3393038 (1968-07-01), Burkhalfer et al.
patent: 3521213 (1970-07-01), Hardy
patent: 3538231 (1970-11-01), Newkirk et al.
patent: 3569787 (1971-03-01), Palmer
patent: 3810734 (1974-05-01), Willson
Gustafson John C.
Haugsjaa Paul O.
Rhodes William H.
Fisher Fred
GTE Laboratories Incorporated
Joyce Harold
Yuen Henry C.
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