Insulated conductors and method of making same

Details Insulated conductors and method of making same Insulated conductors and method of making same

1985-11-15

1988-01-12

Lindsay, Robert L.

Electricity: conductors and insulators

Conduits, cables or conductors

Conductive armor or sheath

65 2, 65 33, 65 31, 174110A, 174124G, H01B 718, C03C 2506

Patent

active

047193182

ABSTRACT:
Mineral insulated conduits are produced by insulating one or several electrical conductors, preferably metallic conductors, with silica staple fibers and sheathing the entire conductor with a metallic jacket. The silica staple fibers are produced by treating dry-spun soda water glass fibers which are free of non-alkaline metal compounds and which have a molar ratio of Na.sub.2 O:SiO.sub.2 of approximately 1:3 to 1:1.9, with aqueous, hydrogen ion containing acid or salt solutions, and then washing, drying, and optionally heat treating. Preferably, a binder is also used. The preferred binders are low in or free of alkalies, such as silica sol, boron trioxide, organosilanes, or the like. The mineral insulated conductors produced are characterized by a low electrical capacitance, low dielectric losses and a high electrical resistivity and are usable in a very wide range of temperatures. Instrument leads, thermocouples and heating conductors may also be produced in this advantageous manner.

REFERENCES:
patent: 2186442 (1940-01-01), Youmans
patent: 2341235 (1944-02-01), Palmer
patent: 2390039 (1945-11-01), Slayter et al.
patent: 2495630 (1950-01-01), Dorst
patent: 3540203 (1970-11-01), Thoresen et al.
patent: 4332600 (1982-06-01), Wegerhoff et al.
The Manufacturing Tech. of Continuous Glass Fibers, 2nd Ed., Loewenstein, 1983, pp. 2, 34 and 35.
E. Mills, BICC Ltd., "Mineral Insulated Metal Sheathed Cables", Wire Industry, May 1976, pp. 409-413.
"Hormone bis Keramik", Ullmanns Encyklopadi der Technischen Chemie, 4, Neubearbeitete und Erweiterte Auflage, Band 13, Weinheim, New York, 1977, p. 367.

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