CA2058137C - Inorganic insulating member - Google Patents
Inorganic insulating memberInfo
- Publication number
- CA2058137C CA2058137C CA 2058137 CA2058137A CA2058137C CA 2058137 C CA2058137 C CA 2058137C CA 2058137 CA2058137 CA 2058137 CA 2058137 A CA2058137 A CA 2058137A CA 2058137 C CA2058137 C CA 2058137C
- Authority
- CA
- Canada
- 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.)
- Expired - Fee Related
Links
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
Abstract
An inorganic insulating member comprises a conductor containing Ni or Ni alloy at least in its outer surface, an oxide layer of Ni or Ni alloy 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 insulating inorganic compound is separated only with difficulty and the inorganic insulating member is improved in heat resistance and insulability.
Description
The present invention relates to an insulating member such as a wire for high temperature operation, an insulated lead wire or the like.
An insulating member such as an insulated wire is generally applied to equipment such as heating equipment or a fire alarm, which requires safety at high temperatures.
An insulated wire is also employed in an automobile under an 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 normally withstand a temperature of about 300C at the most. However, 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.
When an insulated wire is applied to usage requiring high heat resistance or employed under an environment requiring a high degree of vacuum, it is impossible to attain sufficient heat resistance or non-outgassing property with only an organic coating. In this case, therefore, an insulated wire comprising a conductor 20~8137 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 a stainless steel alloy, filled up with fine particles of a metal oxide such as magnesium oxide, or the like is generally employed.
On the other hand, 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.
Further, wires coated with organic materials have been studied, and there have been proposed an alumite-coated wire prepared by alumite-working the surface of an aluminum conductor for forming an Ae2O3 film on its surface, and a wire which is formed by electroanalysis.
However, 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.
In the case of the MI cable, on the other hand, 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.
In the glass braided tube insulated wire, further, fine glass powder is generated and the conductor is disadvantageously exposed due to mesh displacement.
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.
According to the present invention, the oxide layer of Ni or Ni alloy may be 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.
According to the present invention, the insulating inorganic compound layer can advantageously be formed on the oxide layer of Ni or Ni alloy by hydrolyzing and poly-condensing 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.
According to the present invention, 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 intended for high temperature operation, such as an insulated lead wire or the like. However, the present invention is not restricted to such usage.
Embodiments of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
Figure 1 is a sectional view of an inorganic insulating member;
Figure 2 is a sectional view of another embodiment of insulating member; and Figure 3 is a sectional view of a further embodiment of insulating member.
Referring now to the drawings, Figure 1 shows a sectional view showing a first embodiment of the present invention, in which 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.
Figure 2 is a sectional view showing a second embodiment of the present invention. Referring to Figure 2, 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.
Figure 3 is a sectional view showing a third embodiment of the present invention. Referring to Figure 3, 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.
According to the present invention, it is possible to employ a metal having a higher heat resistance than Ae, 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. Although the overall conductor may be made of Ni or Ni alloy, such a material has low conductivity. While Ae has a conductivity of 60% IACS, those of Ni and Ni alloy are 25% IACS and not more than 25%
IACS, respectively. In order to improve conductivity, therefore, the outer surface of a Cu conductor may be plated or clad with Ni. When such an Ni-plated or Ni-clad Cu conductor is used under high temperature for a long time, however, mutual diffusion takes place between Ni and Cu, to form an alloy layer and reduce the conductivity. In order to cope with this, a diffusion preventing layer of BN or the like may be provided in the interface between Ni and Cu, as shown in Figure 3.
-According to the present invention, as hereinabove described, 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.
Examples of such a metal oxide are sio2, Ae2O3, MgO, ZrO2 and composites thereof. Such metal oxides are extremely dense and have smooth surfaces, whereby the same have high insulability and small gas emission.
Further, a metal oxide such as sio2, a metal carbide such as SiC and metal nitrides such as Si3N4, AeN 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 only small affinity with the 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.
According to the present invention, 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 oxide, 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 800C for 30 minutes for oxidation of the surfaces, thereby forming oxide layers. The conductor (3) was subjected to plasma oxidation treatment in Ar - 10% Oz of 10 mTorr for 30 minutes, for forming an oxide layer.
The oxidation-treated conductors (1) to (3) were used to prepare the wires of Examples 1 to 5.
Example 1 Tetrabutyl orthosilicate was hydrolyzed and polycondensed in isopropyl alcohol as solvent, to prepare a coating solution A. The solution A was applied to the oxidation-treated conductor (3) and heated in the atmosphere at 500C, to form an insulating inorganic compound layer of .~.
sioz. This SiO2 insulating layer was about 5 ~m in thickness.
Example 2 Polysilazane was thermally decomposed and polycondensed in an autoclave at a temperature of 460C, 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 600C, to form an SiC
layer of 5 ~m in thickness.
Example 3 Methylchlorodisilane was reacted with hexa-methylene disilazane at 275C, to obtain polysilazane. A
coating solution C was prepared from this polysilazane, applied to the conductor (1) and heated in NH3 gas at 700C, to form an Si3N4 layer of 7 ~m in thickness.
Example 4 Ae(NO3)3 in an amount of 8% was added to the coating solution A, which in turn was applied onto the conductor (1) and heated at 500C, to form an Sio2-Ae2o3 composite layer of 6 ~m in thickness.
Example 5 20 percent by weight of 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.% 2 gas at 600C. This conductor was further coated with the solution C, and heated in NH3 gas at 700C 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, had an overall thickness of about 10 ~m.
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.
The Comparative Example was prepared from an alumite wire, which was obtained by forming an Ae2O3 layer of 10 ~m in thickness around a conventional aluminum wire.
Table 1 Breakdown Voltage Flexibility Example 1 600 V S D
Example 2 500 V 8 D
Example 3 900 V 3 D
Example 4 700 V 5 D
Example 5 1200 V 4 D
Comparative Example 300 V 50 D
As clearly evident from Table 1, 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 the Comparative Example.
As hereinabove described, 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.
An insulating member such as an insulated wire is generally applied to equipment such as heating equipment or a fire alarm, which requires safety at high temperatures.
An insulated wire is also employed in an automobile under an 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 normally withstand a temperature of about 300C at the most. However, 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.
When an insulated wire is applied to usage requiring high heat resistance or employed under an environment requiring a high degree of vacuum, it is impossible to attain sufficient heat resistance or non-outgassing property with only an organic coating. In this case, therefore, an insulated wire comprising a conductor 20~8137 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 a stainless steel alloy, filled up with fine particles of a metal oxide such as magnesium oxide, or the like is generally employed.
On the other hand, 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.
Further, wires coated with organic materials have been studied, and there have been proposed an alumite-coated wire prepared by alumite-working the surface of an aluminum conductor for forming an Ae2O3 film on its surface, and a wire which is formed by electroanalysis.
However, 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.
In the case of the MI cable, on the other hand, 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.
In the glass braided tube insulated wire, further, fine glass powder is generated and the conductor is disadvantageously exposed due to mesh displacement.
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.
According to the present invention, the oxide layer of Ni or Ni alloy may be 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.
According to the present invention, the insulating inorganic compound layer can advantageously be formed on the oxide layer of Ni or Ni alloy by hydrolyzing and poly-condensing 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.
According to the present invention, 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 intended for high temperature operation, such as an insulated lead wire or the like. However, the present invention is not restricted to such usage.
Embodiments of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
Figure 1 is a sectional view of an inorganic insulating member;
Figure 2 is a sectional view of another embodiment of insulating member; and Figure 3 is a sectional view of a further embodiment of insulating member.
Referring now to the drawings, Figure 1 shows a sectional view showing a first embodiment of the present invention, in which 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.
Figure 2 is a sectional view showing a second embodiment of the present invention. Referring to Figure 2, 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.
Figure 3 is a sectional view showing a third embodiment of the present invention. Referring to Figure 3, 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.
According to the present invention, it is possible to employ a metal having a higher heat resistance than Ae, 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. Although the overall conductor may be made of Ni or Ni alloy, such a material has low conductivity. While Ae has a conductivity of 60% IACS, those of Ni and Ni alloy are 25% IACS and not more than 25%
IACS, respectively. In order to improve conductivity, therefore, the outer surface of a Cu conductor may be plated or clad with Ni. When such an Ni-plated or Ni-clad Cu conductor is used under high temperature for a long time, however, mutual diffusion takes place between Ni and Cu, to form an alloy layer and reduce the conductivity. In order to cope with this, a diffusion preventing layer of BN or the like may be provided in the interface between Ni and Cu, as shown in Figure 3.
-According to the present invention, as hereinabove described, 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.
Examples of such a metal oxide are sio2, Ae2O3, MgO, ZrO2 and composites thereof. Such metal oxides are extremely dense and have smooth surfaces, whereby the same have high insulability and small gas emission.
Further, a metal oxide such as sio2, a metal carbide such as SiC and metal nitrides such as Si3N4, AeN 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 only small affinity with the 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.
According to the present invention, 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 oxide, 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 800C for 30 minutes for oxidation of the surfaces, thereby forming oxide layers. The conductor (3) was subjected to plasma oxidation treatment in Ar - 10% Oz of 10 mTorr for 30 minutes, for forming an oxide layer.
The oxidation-treated conductors (1) to (3) were used to prepare the wires of Examples 1 to 5.
Example 1 Tetrabutyl orthosilicate was hydrolyzed and polycondensed in isopropyl alcohol as solvent, to prepare a coating solution A. The solution A was applied to the oxidation-treated conductor (3) and heated in the atmosphere at 500C, to form an insulating inorganic compound layer of .~.
sioz. This SiO2 insulating layer was about 5 ~m in thickness.
Example 2 Polysilazane was thermally decomposed and polycondensed in an autoclave at a temperature of 460C, 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 600C, to form an SiC
layer of 5 ~m in thickness.
Example 3 Methylchlorodisilane was reacted with hexa-methylene disilazane at 275C, to obtain polysilazane. A
coating solution C was prepared from this polysilazane, applied to the conductor (1) and heated in NH3 gas at 700C, to form an Si3N4 layer of 7 ~m in thickness.
Example 4 Ae(NO3)3 in an amount of 8% was added to the coating solution A, which in turn was applied onto the conductor (1) and heated at 500C, to form an Sio2-Ae2o3 composite layer of 6 ~m in thickness.
Example 5 20 percent by weight of 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.% 2 gas at 600C. This conductor was further coated with the solution C, and heated in NH3 gas at 700C 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, had an overall thickness of about 10 ~m.
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.
The Comparative Example was prepared from an alumite wire, which was obtained by forming an Ae2O3 layer of 10 ~m in thickness around a conventional aluminum wire.
Table 1 Breakdown Voltage Flexibility Example 1 600 V S D
Example 2 500 V 8 D
Example 3 900 V 3 D
Example 4 700 V 5 D
Example 5 1200 V 4 D
Comparative Example 300 V 50 D
As clearly evident from Table 1, 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 the Comparative Example.
As hereinabove described, 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.
Claims (6)
1. An inorganic insulating member comprising:
a conductor containing Ni or Ni alloy at least in its outer surface;
an oxide layer of Ni or Ni alloy being formed through oxidation treatment of said outer surface of said conductor; and an insulating inorganic compound layer being formed on said oxide layer of Ni or Ni alloy.
a conductor containing Ni or Ni alloy at least in its outer surface;
an oxide layer of Ni or Ni alloy being formed through oxidation treatment of said outer surface of said conductor; and an insulating inorganic compound layer being formed on said oxide layer of Ni or Ni alloy.
2. An inorganic insulating member in accordance with claim 1, wherein said oxide layer of Ni or Ni alloy is formed by oxidizing said outer surface of said conductor in a vapor phase containing oxygen.
3. An inorganic insulating member in accordance with claim 1 or 2, wherein said insulating inorganic compound layer is made of a metal oxide which is obtained by hydrolyzing and polycondensing metal alkoxide or metal carboxylic ester.
4. An inorganic insulating member in accordance with claim 1 or 2, wherein said insulating inorganic compound layer is made of a metal oxide, a metal carbide or a metal nitride which is obtained by thermally decomposing an organic metal polymer, or a composite thereof.
5. An inorganic insulating member in accordance with claim 1 or 2, wherein said insulating inorganic compound layer contains fine ceramic particles.
6. An inorganic insulating member in accordance with claim 1 or 2, applied to a wire for high temperature use or an insulated lead wire.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3001645A JPH04242011A (en) | 1991-01-10 | 1991-01-10 | Inorganic insulative member |
| JP3-1645 | 1991-01-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2058137A1 CA2058137A1 (en) | 1992-07-11 |
| CA2058137C true CA2058137C (en) | 1996-09-24 |
Family
ID=11507258
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2058137 Expired - Fee Related CA2058137C (en) | 1991-01-10 | 1991-12-19 | Inorganic insulating member |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0494424B1 (en) |
| JP (1) | JPH04242011A (en) |
| CA (1) | CA2058137C (en) |
| DE (1) | DE69131710T2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE69502270T2 (en) * | 1995-02-24 | 1999-01-07 | Sumitomo Electric Industries | Electrical conductor element such as a wire with an inorganic insulating coating |
| DE102009022714B4 (en) * | 2008-05-27 | 2014-01-02 | Alstom Technology Ltd. | Method for oxidizing a thermocouple protective tube |
| DE102008039326A1 (en) | 2008-08-22 | 2010-02-25 | IWT Stiftung Institut für Werkstofftechnik | Preparing electrically insulated electric sheet, to prepare laminated magnetic core, comprises coating one side of sheet using liquid mixture comprising hydrolyzed and condensed metal organic monomer, and heat treating coated sheet |
| US8802230B2 (en) | 2009-12-18 | 2014-08-12 | GM Global Technology Operations LLC | Electrically-insulative coating, coating system and method |
Family Cites Families (5)
| 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 |
| JPS63281313A (en) * | 1987-05-12 | 1988-11-17 | Sumitomo Electric Ind Ltd | Heat-resistant electric wire |
| US4990491A (en) * | 1988-06-29 | 1991-02-05 | Westinghouse Electric Corp. | Insulation for superconductors |
| JPH02301909A (en) * | 1989-05-16 | 1990-12-14 | Sumitomo Electric Ind Ltd | Inorganic insulated cable and its manufacture |
-
1991
- 1991-01-10 JP JP3001645A patent/JPH04242011A/en active Pending
- 1991-12-19 EP EP91121858A patent/EP0494424B1/en not_active Expired - Lifetime
- 1991-12-19 CA CA 2058137 patent/CA2058137C/en not_active Expired - Fee Related
- 1991-12-19 DE DE1991631710 patent/DE69131710T2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04242011A (en) | 1992-08-28 |
| EP0494424A1 (en) | 1992-07-15 |
| CA2058137A1 (en) | 1992-07-11 |
| DE69131710D1 (en) | 1999-11-18 |
| EP0494424B1 (en) | 1999-10-13 |
| DE69131710T2 (en) | 2000-06-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |