EP0494424B1 - Verfahren zur Herstellung eines elektrischen Leiters mit anorganischer Isolierung - Google Patents
Verfahren zur Herstellung eines elektrischen Leiters mit anorganischer Isolierung Download PDFInfo
- Publication number
- EP0494424B1 EP0494424B1 EP91121858A EP91121858A EP0494424B1 EP 0494424 B1 EP0494424 B1 EP 0494424B1 EP 91121858 A EP91121858 A EP 91121858A EP 91121858 A EP91121858 A EP 91121858A EP 0494424 B1 EP0494424 B1 EP 0494424B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- conductor
- alloy
- wire
- layer
- electrical conductor
- 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
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Classifications
-
- 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 a method for producing inorganic insulated electrical conductor according to the preamble of claim 1.
- An insulated electrical conductor i. e. insulating member
- 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 polyamide or fluororesin.
- 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, 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 (Mineral Insulated 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.
- MI cable Standard Insulated cable
- a glass braided tube insulated wire employing an insulating member of glass fiber fabric is known as an insulated wire having heat resistance and flexibility.
- wires coated with in organic materials are studied, and there has been proposed an alumite-coated wire prepared by alumite-working the surface of an aluminum conductor for forming an Al 2 O 3 film on its surface, and a wire which is formed by electrolysis.
- the aluminum-coated wire and the wire which is formed by electrolysis are inferior in heat resistance to a wire employing a metal such as Cu, since the material for the conductors thereof is restricted to aluminium. 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.
- US-A-2 975 078 discloses the features of the preamble of claim 1.
- JP-A-02 301 909 discloses an inorganic insulating member having an Al alloy layer, an oxide layer of the Al alloy and an inorganic insulator layer.
- EP-A-0 292 780 discloses an electric wire coated by gel film which is formed by applying a solution obtained by hydrolyzing and dehydrating/condensing alkoxide onto an outer part of a conductor.
- GB-A-2 220 295 refers to superconducting articles having a generally substoichiometric oxygen insulation between superconducting strands.
- the invented method for producing this inorganic insulating member comprises the features of claim 1.
- 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. Such oxidation treatment is preferably performed in a vapor phase containing oxygen.
- the insulating inorganic compound layer of Al 2 O 3 or SiO 2 can be formed on the oxide layer of Ni or Ni alloy by hydrolyzing and polycondensing metal alkoxide or metal carboxylate, for example.
- the insulating inorganic compound layer can alternatively be formed by thermally decomposing an organic metal polymer.
- the insulating inorganic compound layer may contain fine particles of ceramics.
- the method according to the present invention is applied to produce a wire for a high temperature or an insulated lead wire, for example.
- the present invention is not restricted to such usage.
- Fig. 1 is a sectional view showing a first embodiment produced according to 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 produced according to 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 produced according to 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 e.g. BN may be provided in the interface between Ni and Cu, as shown in Fig. 3.
- the insulating inorganic compound layer is prepared from SiO 2 or Al 2 O 3 which is obtainable by hydrolyzing and polycondensing metal alkoxide or metal carboxylate.
- metal oxides are extremely dense and have smooth surfaces, whereby the same have high insulability and small gas emission.
- SiO 2 which is obtained by thermally decomposing organic metal polymers also has 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 in extremely 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 % O 2 of 10 mTorr (1,33 Pa) 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 SiO 2 .
- This SiO 2 insulating layer was about 5 ⁇ m in thickness.
- Al(NO 3 ) 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 SiO 2 ⁇ Al 2 O 3 composite layer of 6 ⁇ m in thickness.
- Table 1 shows breakdown voltages and flexibility values of the as-formed wires of Examples 1 and 2.
- 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 Al 2 O 3 layer of 10 ⁇ m in thickness around a conventional aluminum wire. Breakdown Voltage Flexibility Example 1 600 V 5 D Example 2 700 V 5 D Comparative Example 300 V 50 D
- the wires of Examples 1 and 2 produced according to the present invention are higher in breakdown voltage and superior in flexibility than the alumite wire of the comparative example.
- the inorganic insulating member produced 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)
Claims (4)
- Verfahren zur Herstellung eines anorganischen isolierten elektrischen Leiters, umfassend:Bereitstellen eines Leiters, der Nickel oder eine Nickellegierung zumindest in seiner äußeren Oberfläche enthält;Bilden einer Oxidschicht von Nickel oder von einer Nickellegierung durch Oxidationsbehandlung der äußeren Oberfläche des Leiters; und Bilden einer isolierenden anorganischen Verbundschicht auf der Oxidschicht von Nickel oder der Nickellegierung;
- Verfahren zur Herstellung eines anorganischen isolierten elektrischen Leiters nach Anspruch 1, bei welchem die Oxidschicht von Nickel oder einer Nickellegierung durch Oxidieren der äußeren Oberfläche des Leiters in einer Sauerstoff enthaltenden Dampfphase gebildet ist.
- Verfahren zur Herstellung eines anorganischen isolierten elektrischen Leiters nach Anspruch 1, bei welchem die isolierende anorganische Verbundschicht feine Keramikpartikel enthält.
- Verfahren zur Herstellung eines anorganischen isolierten elektrischen Leiters nach Anspruch 1, das angewandt wird, um einen hitzebeständigen Draht oder einen isolierten Leitungsdraht herzustellen.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1645/91 | 1991-01-10 | ||
JP3001645A JPH04242011A (ja) | 1991-01-10 | 1991-01-10 | 無機絶縁部材 |
JP164591 | 1991-01-10 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0494424A1 EP0494424A1 (de) | 1992-07-15 |
EP0494424B1 true 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) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0729157B1 (de) * | 1995-02-24 | 1998-04-29 | Sumitomo Electric Industries, Ltd. | Elektrisches Leiterelement wie ein Draht mit anorganischen Isolierbeschichtung |
DE102009022714B4 (de) * | 2008-05-27 | 2014-01-02 | Alstom Technology Ltd. | Verfahren zum Oxidieren eines Thermoelementschutzrohrs |
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 |
US8802230B2 (en) | 2009-12-18 | 2014-08-12 | GM Global Technology Operations LLC | Electrically-insulative coating, coating system and method |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2975078A (en) * | 1957-10-21 | 1961-03-14 | Cons Electrodynamics Corp | Ceramic coated wire |
EP0012422A1 (de) * | 1978-12-12 | 1980-06-25 | The Fujikura Cable Works, Ltd. | Hitzebeständige elektrisch isolierte Leiter und Verfahren zu deren Herstellung |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63281313A (ja) * | 1987-05-12 | 1988-11-17 | Sumitomo Electric Ind Ltd | 耐熱電線 |
US4990491A (en) * | 1988-06-29 | 1991-02-05 | Westinghouse Electric Corp. | Insulation for superconductors |
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 |
-
1991
- 1991-01-10 JP JP3001645A patent/JPH04242011A/ja active Pending
- 1991-12-19 CA CA 2058137 patent/CA2058137C/en not_active Expired - Fee Related
- 1991-12-19 DE DE1991631710 patent/DE69131710T2/de not_active Expired - Fee Related
- 1991-12-19 EP EP91121858A patent/EP0494424B1/de not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2975078A (en) * | 1957-10-21 | 1961-03-14 | Cons Electrodynamics Corp | Ceramic coated wire |
EP0012422A1 (de) * | 1978-12-12 | 1980-06-25 | The Fujikura Cable Works, Ltd. | Hitzebeständige elektrisch isolierte Leiter und Verfahren zu deren Herstellung |
Also Published As
Publication number | Publication date |
---|---|
DE69131710D1 (de) | 1999-11-18 |
EP0494424A1 (de) | 1992-07-15 |
CA2058137A1 (en) | 1992-07-11 |
JPH04242011A (ja) | 1992-08-28 |
DE69131710T2 (de) | 2000-06-08 |
CA2058137C (en) | 1996-09-24 |
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