US3059046A - Solid inorganic insulation for metallic conductors - Google Patents

Solid inorganic insulation for metallic conductors Download PDF

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US3059046A
US3059046A US735891A US73589158A US3059046A US 3059046 A US3059046 A US 3059046A US 735891 A US735891 A US 735891A US 73589158 A US73589158 A US 73589158A US 3059046 A US3059046 A US 3059046A
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weight
conductor
coating
aluminum
parts
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US735891A
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Dean C Westervelt
Charles H Vondracek
Charles F Hofmann
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CBS Corp
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Westinghouse Electric Corp
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Priority to US735891A priority Critical patent/US3059046A/en
Priority to DEW25229A priority patent/DE1109230B/de
Priority to CH7303959A priority patent/CH401190A/de
Priority to JP1528459A priority patent/JPS3518028B1/ja
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Publication of US3059046A publication Critical patent/US3059046A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/48—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances fibrous materials
    • H01B3/50—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances fibrous materials fabric
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/34—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing cold phosphate binders
    • C04B28/346—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing cold phosphate binders the phosphate binder being present in the starting composition as a mixture of free acid and one or more phosphates
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/06—Insulating conductors or cables
    • H01B13/12—Insulating conductors or cables by applying loose fibres
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/002—Inhomogeneous material in general
    • H01B3/006—Other inhomogeneous material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
    • H01B3/025—Other inorganic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
    • H01B3/08—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances quartz; glass; glass wool; slag wool; vitreous enamels
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
    • H01B3/08—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances quartz; glass; glass wool; slag wool; vitreous enamels
    • H01B3/082—Wires with glass or glass wool
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
    • H01B3/08—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances quartz; glass; glass wool; slag wool; vitreous enamels
    • H01B3/084—Glass or glass wool in binder
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/48—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances fibrous materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00482—Coating or impregnation materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/90—Electrical properties
    • C04B2111/92—Electrically insulating materials
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49071—Electromagnet, transformer or inductor by winding or coiling

Definitions

  • Coatings on metallic conductors such as wires must be tough and hard to withstand the severe mechanical abuse to which the windings are subjected in service. Thus, coils frequently are wound from insulated wire under considerable pressure and at high speeds. It is essential that the insulating coating applied to the wire be capable of withstanding the abrasion, bending stresses, and heavy pressures encountered during such winding without breaking, cracking or otherwise disrupting from the wire.
  • Organic enameling compositions are used widely in the electrical industry to provide insulation for metallic conductors such as wires. In general, such organic coatings are not capable of operating satisfactorily for pro-longed periods of time at temperatures substantially above 200 C. There is a need in the electrical industry for a Wire coating composition which, after application and when hardened on the wire, will operate satisfactorily for relatively long periods of time at temperatures of 500 C. and higher.
  • fluid inorganic compositions containing an aluminum compound, phosphoric acid, and a finely divided filler may be applied conveniently to metallic conductors such as wires and thereafter dried to provide a wire with a flexible coating which adheres tenaciously thereto.
  • This wire may be wound on spools and stored. When ready for use, it may be wound into coils or the like and baked to provide members having non-flexible durable, tough, hard insulating coatings which will function satisfactorily at temperatures of 500 C. and higher.
  • the object of the present invention is to provide metallic electrical conductors insulated with a heat-hardened inorganic coating composition comprising (1) an aluminum compound, (2) phosphoric acid, and (3) a finely divided filler.
  • Another object of the invention is to provide electrically conducting wires provided with a layer of inorganic fibrous material and a tough, durable, insulating composition impregnated into at least a portion of the fibrous material, the composition comprising a heat converted fluid inorganic composition comprising (1) an aluminum compound, (2) phosphoric acid, and (3) a finely divided filler.
  • Still another object of this invention is to provide metallic electrical conductors provided with a dry-appearing coating having a moisture content of from 5% to 20%, the coating comprising (1) an aluminum compound, (2) phosphoric acid, and (3) a finely divided filler.
  • FIGURE 1 is a fragmentary isometric view of a metallic conductor provided with a coating composition of this invention
  • I FIG. 2 is a cross-sectional view of a metallic conductor insulated with fibrous material impregnated With a coating composition of this invention.
  • a metallic conductor insulated with a heat c011- verted inorganic composition comprising (A) from 90 to 20 parts by weight of an aqueous mixture consisting of (a) from 10% to 40% by weight of aluminum phosphate, (b) from 10% to 40% by weight of phosphoric acid, (0) the balance water, and (B) from 10 to parts by weight of a certain solid inorganic particulate filler to be described more fully hereinafter.
  • a liquid suspension comprising a mixture of components identified above as (A) and (B) first are applied to the conductor and then dried by passing the coated conductor through a wire coating tower at a temperature of from 50 C. to 400 C. for a period of time sufiicient to reduce the moisture content of the coating to about 20% to 5% by weight.
  • the wire with its applied coating of flexible, tightly adhering dried insulating material may be stored indefinitely before use.
  • the wire When ready for use, the wire may be employed in the building or winding of transformers, motors, solenoids, or other electrical equipment. Heating of the coated wire in the form of wound electrical members at a temperature of from 200 C. to 300 C. for about 5 to 60 minutes results in the development of a fully cured, non-flexible insulating coating on the wire permitting satisfactory continuous use of the member at a temperature of 500 C. or higher for a prolonged period of time.
  • the phosphates employed in this invention are those known as aluminum phosphates.
  • aluminum phosphate refers not only to aluminum phosphate AlPO but also to aluminum mono-hydrogen phosphate Al (l-IPO and to aluminum di-hydrogen phosphate Al(H PO as well as to mixtures of two or more of these.
  • the aluminum phosphate is employed in the aqueous mixture (A) portion in amounts within the range of about 10% to 40% by weight, with amounts within the range of about 18% to 23% by weight being preferred.
  • the phosphoric acid employed includes not only orthophosphoric acid of: the formula H PO but also pyro-phosphoric acid having the formula H P O as well as meta-phosphoric acid having the formula HPO
  • the term phosphoric acid as employed in the instant specification and in the present claims includes metaand pyro-phosphoric acids as Well as ortho-phosphoric acid.
  • Phosphoric acid is employed with the aluminum phosphate in the aqueous mixture (A) portion of the herein described liquid impregnating suspension in amounts within the range of about 10% to 40% by weight, preferably in the range of about 27% to 31% by weight of mixture (A). These amounts are based upon ortho-phosphoric acid. When metaand/ or pyrophosphoric acids are used they should be employed, of course, in equivalent amounts.
  • Inorganic fillers which have been found to be essential for use in combination with the aqueous mixture of aluminum phosphate and phosphoric acid of this invention consist essentially of compounds selected from at least one of the group consisting of the oxides, hydroxides, and silicates of metals selected from the group consisting of calcium, barium, magnesium, cadmium, aluminum, zinc, lead and titanium. These filler compounds may be used singly or in mixtures of any two or more.
  • the filler may be employed in combination with the other components in amounts within the range of from 10 to 80 parts by weight.
  • the particles should have an average size of between and 150 microns, preferably of an average size of from 5 to '75 microns.
  • compositions of this invention are particularly useful in coating metallic conductors or wires since the moisture content of the compositions will be reduced to about 5% to 20% in from one to several seconds at temperatures of from 50 C. to 400 C. in a wire-coating tower.
  • the wire with the dried flexible coating adhering thereto then may be wound on spools and stored. When ready for use, for example in winding coils, the wire may be unwound from the spool and wound into a coil of desired configuration. The wound coil then may be baked at from 200 C. to 300 C. until the coating is converted to a hard, tough non-flexible insulating coating.
  • the phenomenon of rapid drying in the tower occurs only when the particular metal oxide, hydroxide, and silicate fillers herein described are employed in combination with the water mixture of aluminum phosphate and phosphoric acid.
  • the rate at which a given composition will dry depends upon the particular filler used, the amount of filler, and its particle size. In general, the more filler used and the smaller its particle size the faster the composition will harden. Moreover, the metal oxides bring about a faster hardening rate than do the metal silicates.
  • Example I A No. 17 A.W.G. copper wire is passed through a liquid suspension containing 35 parts of calcium silicate having an average particle size of about fifty microns and 65 parts by weight of an aqueous mixture containing 20% of aluminum phosphate, 20% ortho-phosphoric acid, and the balance water.
  • the wire was passed through a coating tower maintained at a temperature of from 200 C. to 250 C. at a rate sufficient to reduce the moisture content in the coating to about 15%.
  • the coating then was dry to the touch and flexible.
  • the insulated wire was wound into a coil and baked seventy-five minutes at 250 C.
  • the insulation on the wire of this coil was non-flexible and had sufiicient heat stability to permit satisfactory operation of the coil at temperatures as high as 500 C.
  • the insulating coating did not chip or break during application of the coating or during winding of the coil.
  • Example 11 A No. 17 A.W.G. aluminum wire was passed through a liquid suspension comprising (A) 60 parts of an aqueous mixture containing (a) 15% of aluminum di-hydrogen phosphate and (b) 15% of pyro-phosphoric acid, and (c) 70% water, and (B) 40 parts of a finely divided filler made up of 5 parts of magnesium oxide and 35 parts aluminum silicate.
  • the coated wire was passed through a wire coating tower maintained at a temperature of 200 C. at a rate whereby the moisture content of the coating was reduced to about 10%.
  • the coating then was flexible on the wire and dry to the touch. After several weeks storage, this coated wire was wound into a solenoid coil. The coil then was baked for twenty-five minutes at 300 C. whereby the coating was converted to non-flexible, tough, hard insulation.
  • the insulating coating did not crack nor break during winding of the coil.
  • Example III The following materials were mixed in a suitable vessel:
  • Percent Aluminum phosphate 20 Phosphoric acid 30 Water 50 A wire coating composition was prepared by addition to sixty-five parts of this mixture, 12 parts of aluminum oxide and twenty-three parts of mica. The resultant composition when applied to wire and dried and baked provided a tough solid electrical insulation for the wire.
  • a conductor 10 comprising a copper Wire 12 coated with a hard, tough, solid inorganic insulating coating 14 produced by applying the liquid coating composition of this invention thereto and drying and curing the same.
  • the coating 14 may be applied by any suitable means, such as by dipping, die-coating, or the like.
  • conductor 12 is illustrated as being circular in cross-section, it will be understood that it may be of any other desirable cross-section such as rectangular, square, fiat strip, foil, or the like.
  • the coatings of this invention also may be applied to electrical conductors such as wire in combination with coatings of inorganic fibrous materials.
  • electrical conductors such as wire in combination with coatings of inorganic fibrous materials.
  • FIG. 2 A copper wire 16 is provided with an exterior coating 18 of a fibrous material which may comprise glass cloth, glass paper, glass mat, asbestos cloth, asbestos paper, asbestos mat, quartz paper, and the like.
  • the fibrous material may be wrapped, braided, or woven or various combinations thereof.
  • a quantity of coating composition 20 of this invention is impregnated into at least a part of the inorganic fibrous material 18 and cured to provide a composite solid insulation on wire 16.
  • Fillers other than the oxides and silicates disclosed hereinabove also may be incorporated in the coating compositions of this invention in amounts up to about 30% by weight. Pigments and dyes also may be added as desired. Examples of additional fillers include mica, silica, and the like. These fillers should be used in finely divided form and they may be employed singly or in combinations of two or more.
  • An insulated electrical conductor comprising, in combination, a metallic conductor and an insulating coating applied to the metallic conductor, the coating having been derived by applying to the conductor a liquid suspension comprising, (A) from to 20 parts by weight of an aqueous mixture consisting of (a) from 10% to 40% by weight of aluminum phosphate, (b) from 10% Conductor 10 may be of a metal such as to 40% by Weight of phosphoric acid, and (c) the balance water, and (B) from 10 to 80 parts by weight of a solid inorganic particulate filler comprising oxides, hydroxides, and silicates of metals selected from the group consisting of calcium, barium, magnesium, cadmium, aluminum, zinc, lead, and titanium, and drying the applied liquid suspension by maintaining it at a temperature of from 50 C. to 400 C. for a period of time sufficient to reduce the moisture content of the suspension to about 5% to 20% by weight and provide an uncured, flexible, tightly-adhering, dry, insulating coating on the conductor
  • An insulated electrical conductor comprising, in combination, a metallic conductor, a layer of inorganic fibrous material applied to the conductor, and a coating applied to impregnate at least a part of the inorganic fibrous material, the coating having been derived by applying to the fibrous material a liquid suspension comprising, (A) from 9 to 20 parts by weight of an aqueous mixture consisting of (a) from 10% to 40% by weight of aluminum phosphate, (b) from 10% to 40% by weight of phosphoric acid, and (c) the balance water, and (B) from 10 to 80 parts by Weight of a solid inorganic particulate filler comprising oxides, hydroxides, and silicates of metals selected from the group consisting of calcium, barium, magnesium, cadmium, aluminum, zinc, lead, and titanium, and drying the applied liquid suspension by maintaining it at a temperature of from 50 C. to 400 C. for a period of time sufficient to reduce the moisture content of the suspension to about to 20% by weight and provide an uncured, flexible
  • Insulated electrical apparatus adapted for use at temperatures as high as 500 C. comprising, in combination, a metallic conductor and a solid insulating coating applied to the conductor, the coating having been derived by applying to the conductor a liquid suspension comprising, (A) from 90 to 20 parts by weight of an aqueous mixture consisting of (a) from to 40% by weight of aluminum phosphate, (12) from 10% to 40% by weight of phosphoric acid, and (c) the balance water and (B) from 10 to 80 parts by weight of a solid inorganic particulate filler comprising oxides, hydroxides, and silicates of metals selected from the group consisting of calcium, barium, magnesium, cadmium, aluminum, zinc, lead, and titanium, and drying the applied liquid suspension by maintaining it at a temperature of from 50 C.
  • a liquid suspension comprising, (A) from 90 to 20 parts by weight of an aqueous mixture consisting of (a) from to 40% by weight of aluminum phosphate, (12) from 10% to 40% by weight of phospho
  • Insulated electrical apparatus adapted for use at temperatures as high as 500 C. comprising, in combination, a metallic conductor, a layer of inorganic fibrous material applied to the conductor, and a solid insulating coating applied to impregnate at least a part of the inorganic fibrous material, the coating having been derived by applying to the fibrous material a liquid suspension comprising, (A) from 90 to 20 parts by weight of an aqueous mixture consisting of (a) from 10% to 40% by weight of aluminum phosphate, (b) from 10% to 40% by weight of phosphoric acid, and (c) the balance water, and (B) from 10 to 80 parts by weight of a solid inorganic particulate filler comprising oxides, hydroxides, and silicates of metals selected from the group consisting of calcium, barium, magnesium, cadmium, aluminum, zinc,
  • An insulated electrical coil comprising a metallic conductor and an insulating coating applied to the metallic conductor, the coating having been derived by applying to the conductor a liquid suspension comprising, (A) from 90 to 20 parts by weight of an aqueous mixture consisting of (a) from 10% to 40% by Weight of aluminum phosphate, (12) from 10% to 40% by weight of phosphoric acid, and (c) the balance water, and (b) from 10 to parts by weight of a solid inorganic particulate filler comprising oxides, hydroxides, and silicates of metals selected from the group consisting of calcium, barium, magnesium, cadmium, aluminum, zinc, lead, and titanium, and drying the applied liquid suspension by maintaining it at a temperature of from 50 C. to 400 C.
  • sufiicient to reduce the moisture content of the suspension to about 5% to 20% by weight and provide an essentially uncured, flexible, tightly-adhering, dry, insulating coating on the conductor, winding the coated conductor into the coil form and then heating the dried coating to a temperature of about 300 C. to
  • An insulated electrical coil comprising, in combination, a metallic conductor, a layer of inorganic fibrous material applied to the conductor and a solid insulating coating applied to impregnate at least a part of the inorganic fibrous material, the coating having been derived by applying to the fibrous material a liquid suspension comprising, (A) from to 20 parts by Weight of an aqueous mixture consisting of (a) from 10% to 40% by weight of aluminum phosphate, (1)) from 10% to 40% by weight of phosphoric acid, and (c) the balance Water, and (B) from 10 to 80 parts by weight of a solid inorganic particulate filler comprising oxides, hydroxides, and silicates of metals selected from the group consisting of calcium, barium, magnesium, cadmium, aluminum, zinc, lead, and titanium, and drying the applied liquid suspension by maintaining it at a temperature of from 50 C.
  • suflicient to reduce the moisture content of the suspension to about 5% to 20% by weight, and provide an essentially uncured, flexible, tightly-adhering, dry insulating coating on the conductor, winding the coated conductor into coiled form and then heating the dried coating to a temperature of about 350 C. to 500 C. to convert it to fully cured, non-flexible, solid insulation.

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Ceramic Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Manufacturing & Machinery (AREA)
  • Inorganic Insulating Materials (AREA)
  • Insulated Conductors (AREA)
  • Organic Insulating Materials (AREA)
US735891A 1958-05-16 1958-05-16 Solid inorganic insulation for metallic conductors Expired - Lifetime US3059046A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US735891A US3059046A (en) 1958-05-16 1958-05-16 Solid inorganic insulation for metallic conductors
DEW25229A DE1109230B (de) 1958-05-16 1959-03-18 Anorganische UEberzugsmasse
CH7303959A CH401190A (de) 1958-05-16 1959-05-08 Verfahren zur Herstellung eines isolierten elektrischen Leiters und nach diesem Verfahren hergestellter Leiter
JP1528459A JPS3518028B1 (cs) 1958-05-16 1959-05-14

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US735891A US3059046A (en) 1958-05-16 1958-05-16 Solid inorganic insulation for metallic conductors

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US3059046A true US3059046A (en) 1962-10-16

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JP (1) JPS3518028B1 (cs)
CH (1) CH401190A (cs)
DE (1) DE1109230B (cs)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3273225A (en) * 1962-02-14 1966-09-20 Anaconda Wire & Cable Co Method of making electromagnetic structures for high-temperature service
US3300843A (en) * 1961-02-09 1967-01-31 Furukawa Electric Co Ltd Self-bonding magnet wire and method
US3303252A (en) * 1963-03-19 1967-02-07 Philadelphia Insulated Wire Co Method of forming products extruded from plastic material
US3343984A (en) * 1962-07-06 1967-09-26 Anaconda Wire & Cable Co Electrical apparatus, insulating composition therefor and method of making the same
US3367796A (en) * 1962-03-08 1968-02-06 Anaconda Wire & Cable Co Pyrolizable enamel coated wire comprising manganese and cobalt chelates
US3413147A (en) * 1964-08-05 1968-11-26 Siemens Planiawerke Ag Method of protectively treating an electrically and thermally conducting refractory body of sintered silicon carbide
US3620861A (en) * 1969-10-27 1971-11-16 George C Wiswell Jr Cable protection and method
US4113534A (en) * 1976-03-31 1978-09-12 Northern Telecom Limited Paper pulp insulated cable and method of manufacture
US4218580A (en) * 1976-03-31 1980-08-19 Northern Telecom Limited Paper pulp insulated cable and method of manufacture
DE3017490A1 (de) * 1980-05-07 1981-11-12 Textured Products, Inc., Mount Vernon, N.Y. Waermebestaendiges flexibles, feuerfestes, elektrisches isolierband und dessen verwendung zum isolieren von elektrischen leitern
US4429007A (en) 1981-10-21 1984-01-31 The United States Of America As Represented By The United States Department Of Energy Electrical wire insulation and electromagnetic coil
US4511406A (en) * 1983-05-10 1985-04-16 The Pathfinders Group Decorative noncombustible coatings and methods of making the same

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8319491D0 (en) * 1983-07-19 1983-08-17 Ici Plc Coating/moulding compositions
EP0151175A4 (en) * 1983-07-26 1986-01-28 Calvin Shubow STRUCTURES WITH TIED AGGREGATES AND THEIR PRODUCTION PROCESS.
JPS6054960A (ja) * 1983-09-27 1985-03-29 メイソナイト　コーポレーシヨン 無機樹脂を製造する組成物および方法並びに得られる製品
CA1229294A (en) * 1984-03-12 1987-11-17 Jeffery L. Barrall Laminated composites
DE3724013A1 (de) * 1987-07-21 1989-02-02 Flachglas Ag Verfahren zum aufbringen einer farbigen beschichtung auf eine oberflaeche einer glasscheibe

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1828211A (en) * 1924-12-21 1931-10-20 Stettiner Chamotte Fabrik Ag Fire and acid proof plastic substance
GB513030A (en) * 1936-12-09 1939-10-02 Sterling Varnish Company Improvements in or relating to insulating coatings for metallic sheets and methods of forming the same
US2233700A (en) * 1940-07-08 1941-03-04 Grossman Cornell Joel Refractory mixture for cast metal molds
US2455758A (en) * 1941-12-10 1948-12-07 Greger Herbert Hans Method of preparing a. mineral binder
US2504764A (en) * 1946-08-30 1950-04-18 Honeywell Regulator Co Thermocouple with wire insulation
US2687967A (en) * 1954-03-12 1954-08-31 Garfield Mfg Company Inorganic thermosetting molding composition
US2888406A (en) * 1955-10-06 1959-05-26 Gen Electric Conductive cements

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR825694A (fr) * 1936-10-28 1938-03-10 Asea Ab Couche isolante appliquée sur des surfaces métalliques et méthode pour l'appliquer

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1828211A (en) * 1924-12-21 1931-10-20 Stettiner Chamotte Fabrik Ag Fire and acid proof plastic substance
GB513030A (en) * 1936-12-09 1939-10-02 Sterling Varnish Company Improvements in or relating to insulating coatings for metallic sheets and methods of forming the same
US2233700A (en) * 1940-07-08 1941-03-04 Grossman Cornell Joel Refractory mixture for cast metal molds
US2455758A (en) * 1941-12-10 1948-12-07 Greger Herbert Hans Method of preparing a. mineral binder
US2504764A (en) * 1946-08-30 1950-04-18 Honeywell Regulator Co Thermocouple with wire insulation
US2687967A (en) * 1954-03-12 1954-08-31 Garfield Mfg Company Inorganic thermosetting molding composition
US2888406A (en) * 1955-10-06 1959-05-26 Gen Electric Conductive cements

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3300843A (en) * 1961-02-09 1967-01-31 Furukawa Electric Co Ltd Self-bonding magnet wire and method
US3273225A (en) * 1962-02-14 1966-09-20 Anaconda Wire & Cable Co Method of making electromagnetic structures for high-temperature service
US3367796A (en) * 1962-03-08 1968-02-06 Anaconda Wire & Cable Co Pyrolizable enamel coated wire comprising manganese and cobalt chelates
US3343984A (en) * 1962-07-06 1967-09-26 Anaconda Wire & Cable Co Electrical apparatus, insulating composition therefor and method of making the same
US3303252A (en) * 1963-03-19 1967-02-07 Philadelphia Insulated Wire Co Method of forming products extruded from plastic material
US3413147A (en) * 1964-08-05 1968-11-26 Siemens Planiawerke Ag Method of protectively treating an electrically and thermally conducting refractory body of sintered silicon carbide
US3620861A (en) * 1969-10-27 1971-11-16 George C Wiswell Jr Cable protection and method
US4113534A (en) * 1976-03-31 1978-09-12 Northern Telecom Limited Paper pulp insulated cable and method of manufacture
US4218580A (en) * 1976-03-31 1980-08-19 Northern Telecom Limited Paper pulp insulated cable and method of manufacture
DE3017490A1 (de) * 1980-05-07 1981-11-12 Textured Products, Inc., Mount Vernon, N.Y. Waermebestaendiges flexibles, feuerfestes, elektrisches isolierband und dessen verwendung zum isolieren von elektrischen leitern
US4429007A (en) 1981-10-21 1984-01-31 The United States Of America As Represented By The United States Department Of Energy Electrical wire insulation and electromagnetic coil
US4511406A (en) * 1983-05-10 1985-04-16 The Pathfinders Group Decorative noncombustible coatings and methods of making the same

Also Published As

Publication number Publication date
CH401190A (de) 1965-10-31
DE1109230B (de) 1961-06-22
JPS3518028B1 (cs) 1960-12-12

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