EP0460238B1 - Isolierter draht - Google Patents

Isolierter draht Download PDF

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Publication number
EP0460238B1
EP0460238B1 EP91901438A EP91901438A EP0460238B1 EP 0460238 B1 EP0460238 B1 EP 0460238B1 EP 91901438 A EP91901438 A EP 91901438A EP 91901438 A EP91901438 A EP 91901438A EP 0460238 B1 EP0460238 B1 EP 0460238B1
Authority
EP
European Patent Office
Prior art keywords
layer
insulated wire
conductor
insulating ceramic
wire
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91901438A
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English (en)
French (fr)
Other versions
EP0460238A1 (de
EP0460238A4 (en
Inventor
Kazuo Osaka Works Of Sumitomo Sawada
Shinji Osaka Works Of Sumitomo Inazawa
Kouichi Osaka Works Of Sumitomo Yamada
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Sumitomo Electric Industries Ltd
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Sumitomo Electric Industries Ltd
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Filing date
Publication date
Application filed by Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Industries Ltd
Publication of EP0460238A1 publication Critical patent/EP0460238A1/de
Publication of EP0460238A4 publication Critical patent/EP0460238A4/en
Application granted granted Critical
Publication of EP0460238B1 publication Critical patent/EP0460238B1/de
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/29—Protection against damage caused by extremes of temperature or by flame
    • H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
    • 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
    • H01B3/10—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances metallic oxides
    • H01B3/105—Wires with oxides
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/29—Protection against damage caused by extremes of temperature or by flame
    • H01B7/292—Protection against damage caused by extremes of temperature or by flame using material resistant to heat

Definitions

  • the present invention relates to an insulated wire, and more particularly, it relates to an insulated wire, a fireproof wire or the like, which can be used under high-temperature or high-vacuum environment.
  • an insulated wire whose conductor is coated with heat resistant organic resin such as polyimide, fluororesin or the like has been employed in equipment such as heating equipment or a fire alarm, for which safety under a high temperature is required, or environment in an automobile, which is heated to a high temperature.
  • heat resistant organic resin such as polyimide, fluororesin or the like
  • an insulated wire whose conductor is passed through a ceramic insulator tube, or an MI cable (Mineral Insulated Cable) whose conductor is passed through a heat resistant alloy tube of a stainless steel alloy which is filled up with metal oxide particulates of magnesium oxide or the like, etc. has been employed in a case for which particularly high heat resistance is required or in environment for which a high degree of vacuum is required.
  • a fiber-glass braided insulated wire employing textile of glass fiber as an insulating member or the like can be mentioned as an insulated wire having flexibility, which can be used under high-temperature environment.
  • an insulated wire which is excellent in heat resistance, insulation and heat dissipativity there exists the so-called alumite wire, which is prepared by anodizing a wire of an aluminum alloy.
  • an insulated wire which is prepared by employing a material such as a metal alkoxide or a metal organic acid salt, being changeable to a ceramics state, and forming a ceramics film around a conductor.
  • the aforementioned insulated wire whose conductor is passed through a ceramics insulator tube has had such a disadvantage that the same is inferior in flexibility although its insulation can be maintained under a high temperature.
  • the aforementioned MI cable can maintain insulation under a high temperature and is flexible as compared with the aforementioned wire whose conductor is passed through a ceramics insulator tube, difficulty is caused when the same is bent with large curvature.
  • the aforementioned fiber-glass braided insulated wire can maintain insulation even under a high temperature, and is excellent in flexibility.
  • the aforementioned alumite wire can maintain insulation even under a high temperature, and has some flexibility.
  • application of the wire has been restricted since the conductor employed for the wire is restricted to aluminum alone.
  • the ceramics layer is mostly a single layer having a small layer thickness, and it has been difficult to increase the breakdown voltage, although the wire is excellent in flexibility.
  • Document D1 being JP 63-195 283, discloses an electric wire which comprises a conductor insulated by two ceramic layers.
  • the coat according to the wire of D1 is prepared by a liquid phase (sol-gel process) step and a vapor phase step.
  • the first layer of the wire according to document D1 is formed of ceramics produced by a reaction of alkoxide.
  • the thickness of the first layer specifically disclosed by D1 is 0.3 ⁇ m (Embodiment 1) and 0.5 ⁇ m (Embodiment 2).
  • D1 does not disclose a wire with a thickness of the first layer which falls within the range from 1 to 10 ⁇ m.
  • D2 is directed to an electric wire which has a coating of a gel film which is formed by applying a solution obtained by hydrolyzing and dehydrating/condensing alkoxide onto an outer part of a conductor and thereafter leaving the same.
  • the content of this document is specifically directed to forming a gel coat, and it is not an object of this document to form a highly adhesive ceramics coat.
  • An object of the present invention is to solve the aforementioned problems of the conventional insulated wires, and to provide an insulated wire which has the following properties:
  • the insulated wire according to the present invention comprises a conductor, a first insulating metal oxide layer which is formed around the conductor, and a second insulating metal oxide layer, containing ceramics particles mixed by addition, which is formed around the first insulating metal oxide layer.
  • the first insulating metal oxide layer and/or the second insulating metal oxide layer can be formed by applying a precursor of a metal oxide containing at least one compound which is selected from a group of alkoxides or organic acid salts of Si, Zr, Al and Ti to the periphery of a conductor and changing the same to a ceramics state by heating, using a method such as a sol-gel method, a thermal decomposition method or the like.
  • a more preferable insulated wire is implemented if the ceramics particles contained in the second insulating metal oxide layer of the present invention are in the form of fine plates.
  • an insulated wire having further superior flexibility is obtained when the layer thickness of the first insulating metal oxide layer is 5 to 10 ⁇ m.
  • an insulated wire comprising a protective coat, by coating the outer side of the second insulating metal oxide layer with an insulating material containing an organic material.
  • the conductor is not particularly restricted so far as the same has conductivity, and the configuration, the material etc. thereof may be selected in response to its application such as a thermocouple or a flexible printed circuit, for example.
  • the insulated wire according to the present invention comprises insulating layers of metal oxides having extremely high melting points around the conductor, it is possible to maintain insulation even under a high temperature, as compared with the conventional insulated wire which is coated with heat resistant organic resin.
  • the insulated wire according to the present invention can be used also under high-vacuum environment, since the same emits no gas.
  • the insulating metal oxide layer can be increased in thickness since the ceramics particles are contained in the insulating metal oxide layer by addition, whereby it is possible to obtain an insulated wire having a high breakdown voltage.
  • first insulating metal oxide layer It is difficult to increase the first insulating metal oxide layer in thickness, and an insulated wire which comprises only the first layer has a low breakdown voltage.
  • first insulating metal oxide layer since the first insulating metal oxide layer is in close contact with the conductor, it is excellent in flexibility and can maintain insulation even if the same is extremely deformed in bending or the like.
  • the second insulating metal oxide layer has high insulability since the same can be easily increased in thickness by applying a substance obtained by adding ceramics particles to a precursor of ceramics to the conductor and baking the same. If this layer alone is formed around the conductor, however, it may not be possible to maintain good insulation due to fine cracks caused in the layer when the same is extremely deformed in bending or the like, since the layer is inferior in adhesion with the conductor as well as bonding property of particles within the layer to the first insulating metal oxide layer.
  • the aforementioned first layer is formed around the conductor and the aforementioned second layer is further formed around the first layer, so that fine cracks, that may be caused in the second layer by extreme deformation resulting from bending or the like, are prevented by the first layer, and it is possible to maintain high insulability over the entire insulating layers.
  • insulating layer(s) When alkoxides or organic acid salts of Si, Zr, Al and Ti are employed as materials for the first and/or second insulating metal oxide layer, it is possible to form homogeneous insulating layer(s) by preparing a precursor of an oxide from these solutions using a method such as a sol-gel method or a thermal decomposition method, applying this precursor to the periphery of the conductor, and further carrying out baking.
  • the ceramics particles which are contained in the second insulating metal oxide layer by addition in advance of application are in the form of a fine plate, it is possible to obtain an insulated wire having a higher breakdown voltage.
  • the thickness of the first insulating metal oxide layer is 5 to 10 ⁇ m, it is possible to obtain an insulated wire having further superior flexibility.
  • the wire as a fireproof wire by providing a protective coat which contains an organic material on the outer side of the second insulating metal oxide layer.
  • Fig. 1 is a sectional view of an insulated wire in which a first insulating silicon oxide layer of 5 ⁇ m in thickness and a second insulating metal oxide layer of 35 ⁇ m in thickness are formed around a nickel-plated copper wire of 1 mm in diameter according to the present invention.
  • Fig. 2 is a sectional view of an insulated wire which is obtained by coating three insulated wires shown in Fig. 1 with polyolefine resin mixed with magnesium hydroxide.
  • a nickel-plated copper wire of 1 mm in diameter was employed as a conductor.
  • nitric acid 1 mole percent was added to a mixed solution of 4 mole percent of tetraethoxysilane, 24 mole percent of water and 71 mole percent of ethyl alcohol. This solution was applied to the aforementioned nickel-plated copper wire, and thereafter baking was continuously carried out at a temperature of 500°C, to form a first insulating silicon oxide layer of 5 ⁇ m in thickness.
  • a substance which was obtained by mixing 2 parts of mica of about 2 ⁇ m in mean particle diameter to 10 parts of a mixed solution of 4 mole percent of tetraethoxysilane, 1 mole percent of tetraethoxyzirconium, 1 mole percent of water and 94 mole percent of ethyl alcohol as ceramics particles, was applied to the periphery of the aforementioned first insulating silicon oxide layer, and thereafter baking was continuously carried out at a temperature of 600°C, to form a second insulating metal oxide layer of 35 ⁇ m in thickness.
  • Fig. 1 is a sectional view of an insulated wire formed by the aforementioned process.
  • a first insulating metal oxide layer 13 is formed around a conductor comprising a nickel-plated layer 12 which is formed around copper 11, and a second insulating metal oxide layer 14 containing ceramics particles is further formed around the same.
  • a breakdown voltage was measured in the process of formation of such an insulated wire, whereby the result was about 500 V. Further, a breakdown voltage of an insulated wire which was provided with the second insulating metal oxide layer containing ceramics particles was measured, whereby the result was at least 1200 V.
  • Example 2 Three insulated wires obtained in Example 1 were employed, and these three wires were coated with polyolefine resin mixed with magnesium hydroxide, to obtain a single wire.
  • Fig. 2 is a sectional view of the wire thus obtained.
  • Three insulated wires 21 are gathered and respectively coated with polyolefine resin 22 mixed with magnesium hydroxide, to form a single wire.
  • This wire continuously served as a wire even if the same was held under a temperature of 850 degrees for 30 minutes.
  • the insulated wire according to the present invention can maintain insulation even under a high temperature, is excellent in flexibility, emits no gas, can use various types of conductors, and is advantageously applicable to an insulated wire, a fireproof wire, a thermocouple and a flexible printed circuit etc., for which a high breakdown voltage is required.

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  • Chemical & Material Sciences (AREA)
  • Insulated Conductors (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Processes Specially Adapted For Manufacturing Cables (AREA)
  • Inorganic Insulating Materials (AREA)

Claims (10)

  1. Isolierter Draht, umfassend einen Leiter, eine erste isolierende Keramikschicht, welche um den Leiter gebildet ist, und eine zweite isolierende Keramikschicht, welche keramische Partikel enthalt, die dem Precursor von Keramik zugefügt sind, der um die erste isolierende Keramikschicht gebildet ist, wobei die erste isolierende Keramikschicht und/oder die zweite isolierende Keramikschicht durch Backen eines Precursors gebildet ist, der wenigstens eine Komponente enthält, die aus einer Gruppe von Alkoxiden oder, organischen Säuresalzen von Si, Zr, Al und Ti ausgewählt ist, wobei die zweite Schicht dicker ist als die erste Schicht und wobei die erste Schicht eine Dicke von 5 bis 10 µm aufweist.
  2. Isolierter Draht nach Anspruch 1, worin die keramischen Partikel eine plattenartige Struktur aufweisen.
  3. Isolierter Draht nach Anspruch 1 bis 2, ferner umfassend einen ein organisches Material enthaltenden Schutzmantel auf der Außenseite der zweiten Schicht.
  4. Isolierter Draht nach einem der Ansprüche 1 bis 3, worin der elektrische Leiter aus nickel-platiertem Kupfer besteht.
  5. Isolierter Draht nach einem der Ansprüche 1 bis 4, worin der erste Leiter aus Siliziumoxid besteht und die keramische Phase aus dem Precursor von Keramik in der zweiten Schicht Siliziumoxid umfaßt.
  6. Verfahren zum Herstellen eines isolierten Drahts, umfassend die Schritte:
    (a) Bereitstellen eines elektrischen Leiters;
    (b) Bilden einer ersten isolierenden keramischen Schicht um den Leiter;
    (c) Bilden einer zweiten isolierenden Schicht, welche dem Precursor von Keramik zugefügte keramische Teilchen enthält, um die erste isolierende Keramikschicht, wobei
    die erste isolierende keramische Schicht und/oder die zweite isolierende keramische Schicht durch Backen eines Precursors gebildet ist, welcher wenigstens eine Komponente enthält, die aus einer Gruppe von Alkoxiden oder organischen Säuresalzen von Si, Zr, Al und Ti ausgewählt ist, wobei die zweite Schicht dicker ist als die erste Schicht und wobei die erste Schicht eine Dicke von 5 bis 10 µm aufweist.
  7. Verfahren nach Anspruch 6, worin die keramischen Partikel eine plattenartige Struktur aufweisen.
  8. Verfahren nach einem der Ansprüche 6 oder 7, ferner umfassend einen Schritt zum Bilden eines ein organisches Material enthaltenden Schutzmantels auf der Außenseite der zweiten Schicht.
  9. Verfahren nach einem der Ansprüche 6 bis 8, worin der elektrische Leiter aus nickel-platiertem Kupfer besteht.
  10. Verfahren nach einem der Ansprüche 6 bis 9, worin Siliziumoxid in dem Schritt zum Bilden der ersten Schicht erzeugt wird, und wobei Siliziumoxid in dem Schritt zum Bilden der zweiten Schicht erzeugt wird.
EP91901438A 1989-12-27 1990-12-26 Isolierter draht Expired - Lifetime EP0460238B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP3434/89 1989-12-27
JP34348989A JPH03201311A (ja) 1989-12-27 1989-12-27 絶縁電線
JP343489 1989-12-27
PCT/JP1990/001700 WO1991010238A1 (fr) 1989-12-27 1990-12-26 Cable isole

Publications (3)

Publication Number Publication Date
EP0460238A1 EP0460238A1 (de) 1991-12-11
EP0460238A4 EP0460238A4 (en) 1992-11-25
EP0460238B1 true EP0460238B1 (de) 2000-05-03

Family

ID=18361918

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91901438A Expired - Lifetime EP0460238B1 (de) 1989-12-27 1990-12-26 Isolierter draht

Country Status (5)

Country Link
EP (1) EP0460238B1 (de)
JP (1) JPH03201311A (de)
CA (1) CA2050339C (de)
DE (1) DE69033532D1 (de)
WO (1) WO1991010238A1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2698937B2 (ja) * 1990-11-13 1998-01-19 矢崎総業株式会社 セラミックスコーティング耐熱絶縁電線
US7795538B2 (en) 2007-11-06 2010-09-14 Honeywell International Inc. Flexible insulated wires for use in high temperatures and methods of manufacturing
GB0810572D0 (en) * 2008-06-10 2008-07-16 Univ Teeside Electrically insulating coating and method
US8680397B2 (en) 2008-11-03 2014-03-25 Honeywell International Inc. Attrition-resistant high temperature insulated wires and methods for the making thereof
GB201308704D0 (en) * 2013-05-15 2013-06-26 Rolls Royce Plc Electrical apparatus encapsulant

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53136009A (en) * 1977-05-04 1978-11-28 Riken Keikinzoku Kogyo Kk Aluminium oxide structures
JPS5818809A (ja) * 1981-07-24 1983-02-03 株式会社デンソー 耐過負荷絶縁電線及びその製造方法
JPS63281313A (ja) * 1987-05-12 1988-11-17 Sumitomo Electric Ind Ltd 耐熱電線
SE469170B (sv) * 1988-06-14 1993-05-24 Gte Valenite Corp Sammansatta belaeggningar paa eldfasta substrat samt foerfarande foer framstaellning daerav
JPH02123618A (ja) * 1988-11-02 1990-05-11 Opt D D Meruko Lab:Kk 耐熱性絶縁電線

Also Published As

Publication number Publication date
WO1991010238A1 (fr) 1991-07-11
CA2050339C (en) 1997-12-02
DE69033532D1 (de) 2000-06-08
EP0460238A1 (de) 1991-12-11
CA2050339A1 (en) 1991-06-28
JPH03201311A (ja) 1991-09-03
EP0460238A4 (en) 1992-11-25

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