EP0494424A1 - Anorganische Isolierung - Google Patents

Anorganische Isolierung Download PDF

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Publication number
EP0494424A1
EP0494424A1 EP91121858A EP91121858A EP0494424A1 EP 0494424 A1 EP0494424 A1 EP 0494424A1 EP 91121858 A EP91121858 A EP 91121858A EP 91121858 A EP91121858 A EP 91121858A EP 0494424 A1 EP0494424 A1 EP 0494424A1
Authority
EP
European Patent Office
Prior art keywords
alloy
conductor
insulating member
layer
metal
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.)
Granted
Application number
EP91121858A
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English (en)
French (fr)
Other versions
EP0494424B1 (de
Inventor
Kazuo c/o Osaka Works Sazada
Shinji C/O Osaka Works Inazawa
Kouichi C/O Osaka Works Yamada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Electric Industries Ltd
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Sumitomo Electric Industries Ltd
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Publication date
Application filed by Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Industries Ltd
Publication of EP0494424A1 publication Critical patent/EP0494424A1/de
Application granted granted Critical
Publication of EP0494424B1 publication Critical patent/EP0494424B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01B3/02—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 insulating member such as a wire for a high temperature, an insulated lead wire or the like, for example.
  • An insulating member such as an insulated wire is generally applied to equipment such as heating equipment or a fire alarm, which requires safety under a high temperature.
  • An insulated wire is also employed in an automobile under environment which is heated to a high temperature.
  • Such an insulated wire is generally formed by a conductor which is coated with heat-resistant organic resin such as polyimide, fluororesin or the like.
  • Such a resin-coated wire can merely withstand a temperature of about 300°C at the most.
  • a wire which is employed in a high vacuum apparatus must have high heat resistance against baking etc., small emission characteristics as to gas and water which are absorbed for achieving and maintaining a high degree of vacuum, and small gas emission caused by thermal decomposition. It is impossible to satisfy such requirements for heat resistance and non-outgassing property with the conventional wire which is coated with an organic material.
  • an insulated wire comprising a conductor which passes through an insulator tube of ceramics, an MI cable comprising a conductor which passes through a tube of a heat-resistant alloy, such as stainless steel alloy, filled up with fine particles of a metal oxide such as magnesium oxide, or the like.
  • a glass braided tube insulated wire employing an insulating member of glass fiber fabric or the like is known as an insulated wire having heat resistance and flexibility.
  • wires coated with organic materials are studied, and there have been proposed an alumite-coated wire prepared by alumite-working the surface of an aluminum conductor for forming an Al2O3 film on its surface, and a wire which is formed by electroanalysis.
  • the aluminum-coated wire and the wire which is formed by electroanalysis are inferior in heat resistance to a wire employing a metal such as Cu, since the material for the conductors thereof is restricted to aluminum. Further, such conventional wires have only low breakdown voltages and high gas emission characteristics due to porous films.
  • the overall diameter is increased as compared with the conductor diameter leading to an inferior space factor. Thus, it is impossible to feed a high current.
  • An object of the present invention is to provide an inorganic insulating member, which is excellent in heat resistance and insulability.
  • the inorganic insulating member according to the present invention comprises a conductor containing Ni or Ni alloy at least in its outer surface, an oxide layer of Ni or Ni alloy which is formed through oxidation treatment of the outer surface of the conductor, and an insulating inorganic compound layer which is formed on the oxide layer of Ni or Ni alloy.
  • the oxide layer of Ni or Ni alloy is formed through oxidation treatment of Ni or Ni alloy forming the outer surface of the conductor.
  • oxidation treatment is preferably performed in a vapor phase containing oxygen.
  • the insulating inorganic compound layer can be formed on the oxide layer of Ni or Ni alloy by hydrolyzing and polycondensing metal alkoxide or metal carboxylic ester, for example.
  • the insulating inorganic compound layer can alternatively be formed by thermally decomposing an organic metal polymer. According to this method, it is possible to form a metal oxide, a metal carbide, a metal nitride or a composite thereof.
  • the insulating inorganic compound layer may contain fine particles of ceramics.
  • the inorganic insulating member according to the present invention is applied to a wire for a high temperature, an insulated lead wire or the like, for example.
  • the present invention is not restricted to such usage.
  • Fig. 1 is a sectional view showing a first embodiment of the present invention. Referring to Fig. 1, an Ni oxide layer 2 is formed around an Ni conductor 1, and an insulating inorganic compound layer 3 is formed around the Ni oxide layer 2.
  • Fig. 2 is a sectional view showing a second embodiment of the present invention.
  • an Ni alloy oxide layer 12 is formed around an Ni alloy conductor 11.
  • An insulating inorganic compound layer 13 is formed around the Ni alloy oxide layer 12.
  • Fig. 3 is a sectional view showing a third embodiment of the present invention.
  • a diffusion preventing layer 24 of carbon for example, is provided around a Cu conductor 20.
  • An Ni layer 21 is formed around the diffusion preventing layer 24.
  • An Ni oxide layer 22 is formed around the Ni layer 21, and an insulating inorganic compound layer 23 is formed around the Ni oxide layer 22.
  • a metal having higher heat resistance than Al which is generally employed for a conductor.
  • At least the outer surface of a conductor employed in the present invention is made of Ni or Ni alloy.
  • the overall conductor may be made of Ni or Ni alloy, such a material has low conductivity.
  • Al has conductivity of 60 % IACS, those of Ni and Ni alloy are 25 % IACS and not more than 25 % IACS.
  • the outer surface of a Cu conductor may be plated or clad with Ni.
  • a diffusion preventing layer of BN or the like may be provided in the interface between Ni and Cu, as shown in Fig. 3.
  • the insulating inorganic compound layer can be prepared from a metal oxide which is obtained by hydrolyzing and polycondensing metal alkoxide or metal carboxylic ester.
  • a metal oxide which is obtained by hydrolyzing and polycondensing metal alkoxide or metal carboxylic ester.
  • metal oxides are SiO2, Al2O3, MgO, ZrO2 and composites thereof, for example.
  • Such metal oxides are extremely dense and have smooth surfaces, whereby the same have high insulability and small gas emission.
  • a metal oxide such as SiO2
  • a metal carbide such as SiC and metal nitrides such as Si3N4, AlN and BN, which are obtained by thermally decomposing organic metal polymers, or composites thereof also have high insulability and small gas emission.
  • An insulating inorganic compound layer of such a material has small affinity with Ni or Ni alloy forming the outer surface of the conductor. When this layer is directly applied, therefore, it is impossible to attain high adhesion and the layer is easily separated. Thus, the member cannot be bent.
  • Ni or Ni alloy forming the outer surface of the conductor is subjected to oxidation treatment for forming an oxide layer of Ni or Ni alloy, so that the insulating inorganic compound layer is formed on this oxide layer.
  • the oxide layer is extremely in close contact with the conductor surface, and has excellent adhesion to the insulating inorganic compound layer. According to the present invention, therefore, the insulating inorganic compound layer is hardly separated, and excellent flexibility is attained when the inventive insulating member is applied to a wire, for example.
  • Conductors of (1) an Ni wire of 0.5 mm in wire diameter, (2) Ni - 15 wt.% Cr alloy wire of 0.32 mm in wire diameter, and (3)Ni/BN/Cu clad wire, comprising a Cu wire of 0.38 mm in diameter being clad with an Ni layer of 50 ⁇ m in thickness through a carbon layer of 10 ⁇ m in thickness, serving as a diffusion preventing layer, were employed to prepare inorganic insulating members according to the present invention.
  • the conductors (1) and (2) were heat treated in the atmosphere at 800°C for 30 minutes for oxidation of the surfaces, thereby forming oxide layers.
  • the conductor (3) was subjected to plasma oxidation treatment in Ar - 10 % O2 of 10 mTorr for 30 minutes, for forming an oxide layer.
  • the oxidation-treated conductors (1) to (3) were used to prepare wires of Examples 1 to 5.
  • Tetrabutyl orthosilicate was hydrolyzed and polycondensed in a solvent of isopropyl alcohol, to prepare a coating solution A.
  • the solution A was applied to the oxidation-treated conductor (3) and heated in the atmosphere at 500°C, to form an insulating inorganic compound layer of SiO2.
  • This SiO2 insulating layer was about 5 ⁇ m in thickness.
  • Polysilazane was thermally decomposed and polycondensed in an autoclave at a temperature of 460°C, to obtain polycarbosilane.
  • a coating solution B was prepared from this polycarbosilane, applied to the oxidation-treated conductor (2) and heated in N2 gas at 600°C, to form an SiC layer of 5 ⁇ m in thickness.
  • Methylchlorodisilane was reacted with hexamethylene disilazane at 275°C, to obtain polysilazane.
  • a coating solution C was prepared from this polysilazane, applied to the conductor (1) and heated in NH3 gas at 700°C, to form an Si3N4 layer of 7 ⁇ m in thickness.
  • Al(NO3)3 of 8 % was added to the coating solution A, which in turn was applied onto the conductor (1) and heated at 500°C, to form an SiO2 ⁇ Al2O3 composite layer of 6 ⁇ m in thickness.
  • SiO2 particles of 1 ⁇ m in particle diameter were dispersed in the coating solution B, which in turn was applied onto the conductor (1) and heated in N2 - 0.3 vol.% O2 gas at 600°C.
  • This conductor was further coated with the solution C, and heated in NH3 gas at 700°C to form an insulating inorganic compound layer.
  • This inorganic compound layer which was formed by an Si3N4 layer and a partially oxidized SiC layer containing SiO2 particles, was about 10 ⁇ m in thickness as a whole.
  • Table 1 shows breakdown voltages and flexibility values of the as-formed wires of Examples 1 to 5.
  • the flexibility values were evaluated in terms of diameter ratios, by winding the wires on circular cylinders of a prescribed diameter and measuring the minimum diameters causing no separation of the insulating inorganic compound layers.
  • Comparative example was prepared from an alumite wire, which was obtained by forming an Al2O3 layer of 10 ⁇ m in thickness around a conventional aluminum wire.
  • the wires of Examples 1 to 5 according to the present invention are higher in breakdown voltage than and superior in flexibility to the alumite wire of comparative example.
  • the inorganic insulating member according to the present invention has an insulating inorganic compound layer which is hardly separated, and is excellent in heat resistance and insulability.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Insulated Conductors (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Inorganic Insulating Materials (AREA)
EP91121858A 1991-01-10 1991-12-19 Verfahren zur Herstellung eines elektrischen Leiters mit anorganischer Isolierung Expired - Lifetime EP0494424B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP3001645A JPH04242011A (ja) 1991-01-10 1991-01-10 無機絶縁部材
JP1645/91 1991-01-10
JP164591 1991-01-10

Publications (2)

Publication Number Publication Date
EP0494424A1 true EP0494424A1 (de) 1992-07-15
EP0494424B1 EP0494424B1 (de) 1999-10-13

Family

ID=11507258

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91121858A Expired - Lifetime EP0494424B1 (de) 1991-01-10 1991-12-19 Verfahren zur Herstellung eines elektrischen Leiters mit anorganischer Isolierung

Country Status (4)

Country Link
EP (1) EP0494424B1 (de)
JP (1) JPH04242011A (de)
CA (1) CA2058137C (de)
DE (1) DE69131710T2 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0729157A1 (de) * 1995-02-24 1996-08-28 Sumitomo Electric Industries, Ltd. Elektrisches Leiterelement wie ein Draht mit anorganischen Isolierbeschichtung
DE102008039326A1 (de) 2008-08-22 2010-02-25 IWT Stiftung Institut für Werkstofftechnik Verfahren zum elektrischen Isolieren von Elektroblech, elektrisch isoliertes Elektroblech, lamellierter magnetischer Kern mit dem Elektroblech und Verfahren zum Herstellen eines lamellierten magnetischen Kerns
DE102010054595B4 (de) * 2009-12-18 2014-02-20 GM Global Technology Operations LLC (n. d. Gesetzen des Staates Delaware) Elektrisch isolierende Beschichtung und Verfahren zum Bilden einer elektrisch isolierenden Beschichtung

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009022714B4 (de) * 2008-05-27 2014-01-02 Alstom Technology Ltd. Verfahren zum Oxidieren eines Thermoelementschutzrohrs
CN110010296A (zh) * 2019-04-26 2019-07-12 金杯电工衡阳电缆有限公司 一种含有缓冲结构的中压阻燃耐火电力电缆

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0292780A1 (de) * 1987-05-12 1988-11-30 Sumitomo Electric Industries, Ltd. Elektrischer Draht
GB2220295A (en) * 1988-06-29 1990-01-04 Westinghouse Electric Corp Superconducting articles
JPH02301909A (ja) * 1989-05-16 1990-12-14 Sumitomo Electric Ind Ltd 無機絶縁電線およびその製造方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2975078A (en) * 1957-10-21 1961-03-14 Cons Electrodynamics Corp Ceramic coated wire
US4342814A (en) * 1978-12-12 1982-08-03 The Fujikura Cable Works, Ltd. Heat-resistant electrically insulated wires and a method for preparing the same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0292780A1 (de) * 1987-05-12 1988-11-30 Sumitomo Electric Industries, Ltd. Elektrischer Draht
GB2220295A (en) * 1988-06-29 1990-01-04 Westinghouse Electric Corp Superconducting articles
JPH02301909A (ja) * 1989-05-16 1990-12-14 Sumitomo Electric Ind Ltd 無機絶縁電線およびその製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 015, no. 086 (E - 1039) 28 February 1991 (1991-02-28) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0729157A1 (de) * 1995-02-24 1996-08-28 Sumitomo Electric Industries, Ltd. Elektrisches Leiterelement wie ein Draht mit anorganischen Isolierbeschichtung
DE102008039326A1 (de) 2008-08-22 2010-02-25 IWT Stiftung Institut für Werkstofftechnik Verfahren zum elektrischen Isolieren von Elektroblech, elektrisch isoliertes Elektroblech, lamellierter magnetischer Kern mit dem Elektroblech und Verfahren zum Herstellen eines lamellierten magnetischen Kerns
DE102010054595B4 (de) * 2009-12-18 2014-02-20 GM Global Technology Operations LLC (n. d. Gesetzen des Staates Delaware) Elektrisch isolierende Beschichtung und Verfahren zum Bilden einer elektrisch isolierenden Beschichtung
US8802230B2 (en) 2009-12-18 2014-08-12 GM Global Technology Operations LLC Electrically-insulative coating, coating system and method

Also Published As

Publication number Publication date
DE69131710T2 (de) 2000-06-08
DE69131710D1 (de) 1999-11-18
JPH04242011A (ja) 1992-08-28
CA2058137C (en) 1996-09-24
CA2058137A1 (en) 1992-07-11
EP0494424B1 (de) 1999-10-13

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