Coating processes – Electrical product produced – Coil or winding
Patent
1976-03-08
1978-01-10
Kendall, Ralph S.
Coating processes
Electrical product produced
Coil or winding
23254E, 23255E, 23288F, 23288FC, 252520, 338 34, 427 77, 427 78, 427101, 427105, 427376A, 427178, H01C 1300
Patent
active
040680215
ABSTRACT:
A catalytic combustion-type, gas sensing, resistive element and the method of making it by forming an electrical conductor, whose electrical resistance varies with temperature, into a helical coil, coating the coil with a refractory material whose coating matures at a temperature in the range of 1200.degree. C to 1400.degree. C, and heating the coated coil at that temperature range until the coating matures and shrinks into a dense, gas-tight sheath about the helical coil. The coating on the helical coil is integral between adjacent loops and there is a hollow space along the longitudinal axis of the coil. The exterior of the sheath coating may then be further coated with a catalyst, catalytic wash coating, or in some embodiments the hollow space is filled with a porous catalytic material such as platinum and the ends of the hollow space are capped with a porous refractory ceramic material. In these and other embodiments a porous refractory ceramic material may also be applied over the catalytic surface to allow combustible gases and oxygen to diffuse into the catalytic surface while protecting the catalytic surface from airborne materials which would otherwise render it inactive. A compensating element is made by the same method but is coated with a non-reactive, non-catalytic material. In the preferred embodiments the refractory material contains primarily alumina with small and equal amounts of manganese dioxide and titanium dioxide.
REFERENCES:
patent: 2416864 (1947-03-01), Bricker
patent: 3029360 (1962-04-01), Etter
patent: 3092799 (1963-06-01), Baker
patent: 3138948 (1964-06-01), Pfefferle
patent: 3450565 (1969-07-01), Theodosopoulos
patent: 3564474 (1971-02-01), Firth et al.
Gingrande A., "Self-Insulating Heating Coil", Western Electric Tech. DIG. No. 23, (7-1971), p. 23.
Dictaphone Corporation
Kendall Ralph S.
Smith John D.
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