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US 5,471,032 AGranted
Electrical resistance ignitor with spaced parallel filaments brazed in refractory block recesses
AssigneeEaton Corporation
InventorsGordon B. Spellman, C. Greg Chen
Life of this patent
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Abstract
An ignitor for fuel gas burners formed of a plurality of spaced parallel filaments of SiC coated Carbon (C) high temperature brazed with Chromium Silicide in grooves provided in a refractory base block of Aluminum Oxide and Silicon Oxide. Terminal posts of IVIoSi are embedded in the high temperature braze. Stainless steel lead attachment pads are nickel-chrome brazed to the posts at a lower temperature. Removable notched graphite bridges and graphite hold-down blocks position the filaments during the high temperature brazing.
Claims3
The method of making an electrical resistance ignitor for gaseous fuel comprising:
- (a) forming a pair of spaced recesses in a refractory base;
- (b) disposing an array of relatively thin filaments coated with silicon carbide material with opposite ends thereof in said recesses;
- (c) disposing a mixture of elemental silicon and chromium silicide (CrSi.sub.2) in said recesses;
- and,
- (d) heating said base, filaments, and mixture to a temperature of at least 1300.degree. C. and melting said mixture and securing the ends of said filaments by weldment in said recesses;
- and,
- (e) providing terminal means and securing same in said weldment and brazing a connector to said .terminal means at a temperature substantially less than said 1300.degree. C.
4 more elements
Dependencies are inferred from the claim text.