EP1120797B1 - Procédé de fabrication d'un fil conducteur réalisé dans un matériau composite à matrice en cuivre et fil conducteur obtenu par ledit procédé - Google Patents
Procédé de fabrication d'un fil conducteur réalisé dans un matériau composite à matrice en cuivre et fil conducteur obtenu par ledit procédé Download PDFInfo
- Publication number
- EP1120797B1 EP1120797B1 EP01400151A EP01400151A EP1120797B1 EP 1120797 B1 EP1120797 B1 EP 1120797B1 EP 01400151 A EP01400151 A EP 01400151A EP 01400151 A EP01400151 A EP 01400151A EP 1120797 B1 EP1120797 B1 EP 1120797B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wire
- fact
- cable
- silver
- composite material
- 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
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- 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
Definitions
- the invention relates to a method for manufacturing a conductive wire made of a copper matrix composite material in which are scattered metal or ceramic particles, the wire conductor obtained from this method, and a shielding braid.
- Copper is a widely used material, because of its high electrical conductivity, as the material constituting the conducting wire in electrical and electronic cables.
- copper has mechanical characteristics mediocre often insufficient to make it the material of the thread cable conductor having to have a high mechanical strength, especially in flexion and torsion.
- a copper alloy which, by different hardening mechanisms, has a mechanical strength superior to copper, while exhibiting electrical conductivity at less than 85% of the electrical conductivity of copper.
- these alloys include Cu-Cd, Cu-Zr, Cu-Fe and Cu-Cd-Cr.
- the present invention aims to provide a method of making it possible to obtain a conductive wire having a better electrical conductivity than the alloys of the prior art, at the same time more mechanical resistance, especially in torsion and in bending, as well as good high temperature stability of these properties mechanical.
- said ductile material belongs to the group including silver, gold, platinum, palladium and their alloys.
- said particles comprise aluminum oxide, preferably from 0.2 to 0.4% by weight composite material.
- said coating step of the base wire includes the electrolytic deposition of a layer silver having a thickness of between 1 and 10 ⁇ m, preferably between 3 and 6 ⁇ m.
- a favorable solution for the manufacturing technique provides that the drawing includes several passes in a machine of multi-cold wire drawing and allows to obtain a final diameter for the wire secondary at least five times smaller than the nominal diameter of the wire primary, preferably substantially ten times smaller.
- the present invention also relates to a thread as a result of the aforementioned manufacturing method, this thread being made of a copper matrix composite material in which are dispersed metal or ceramic particles, this wire being characterized by it further comprises a coating of ductile material and in that it has an electrical conductivity of not less than 92% of the Electrical conductivity of copper (International Annealed Copper Standard).
- the wire according to the present invention is characterized in that when a braid shielding electromagnetic cable is made with said conductive wire, when said cable is subjected to one million (1,000,000) cycles of flexion and torsion combined, each cycle of flexion and torsion corresponding to the passage of a cable section relative to an initial position, on the one hand relative to a main direction of the cable from a 0 ° position, to a position at + 140 °, a position at -140 ° and the return at the 0 ° position (torsion), and secondly with respect to a direction orthogonal to said main direction of the cable from a 0 ° position, to a position at + 140 °, to a position at -140 ° and the return to the 0 ° position (bending), said Braid has a maximum electrical resistance variation of 7%.
- the conducting wire has a value of tensile breaking load greater than or equal to 300 MPa.
- said ductile material belongs to the group including silver, gold, platinum, palladium and their alloys.
- the ductile material is a layer electrolytically obtained silver and said particles comprise aluminum oxide, preferably from 0.2 to 0.4% by weight of the material composite.
- the method of manufacturing the lead wire uses a basic wire made of a copper matrix composite material in which are dispersed metal or ceramic particles.
- the composite material used is therefore developed by powder metallurgy by dispersing homogeneous way of metallic or ceramic fine particles (eg examples of oxides, carbides, nitrides or silicides) in a copper matrix.
- the effect of these scattered particles on the microstructure copper metallurgy makes it possible, on the one hand, to increase the resistances mechanical properties of the material and, on the other hand, to maintain this mechanical strength up to high temperatures, without much altering the electrical conductivity of the copper matrix.
- the manufacturing method according to the present invention allows obtaining a conductive wire having, surprisingly, very high mechanical performance, electrical conductivity and holding high temperature mechanics.
- the manufacturing method according to the present invention comprises essentially three basic wire processing steps performed in the said composite material, namely successively silvering, wire drawing and annealing heat treatment.
- GLIDCOP registered trademark sold by SCM Metal Products Inc.
- This composite material contains 0.25 to 0.35% by weight of aluminum oxide particles dispersed in the copper matrix and has a maximum electrical conductivity equal to 92% of that of copper. The size of these particles is between 3 and 12 nanometers.
- a 0.8 mm diameter base wire made of this material was used as a starting point to develop a common thread according to the present invention.
- the next stage of the manufacturing process consists, in particular to avoid breakage of the basic wire during the subsequent passage through the cold wire drawing machine for continuous reduction of the section of the base wire, to deposit a silver coating on the base wire, this coating being preferentially carried out electrolytically and having a thickness of 3 to 6 ⁇ m.
- this step of coating the base wire silver comprises the following steps: alkaline degreasing of the wire of base, baseline water rinse, acid stripping of base wire, rinsing base wire water, electrolytic deposition of silver underlayment on the base wire, electrolytic deposit of a layer of silver on the underlayer to form a primary wire, and rinsing with water of the primary wire.
- This primary wire (silver wire) is then, in a second step, drawn continuously using a multipass cold drawing machine, the last channels used to lead to a secondary line having a final diameter of 0.106 mm, or 0.100 mm or 0.079 mm.
- the silver coating remains continuous and homogeneous and results in a layer of thickness about 1 micron.
- the last stage of the manufacturing process consists of a heat treatment.
- This heat treatment is intended to restore the ductility of the composite material by attenuating the internal stresses of the material created by the drawing step.
- this treatment thermal will consist of an annealing during which the secondary wire has been brought to a temperature between 450 and 520 ° C for a time between 150 and 210 min.
- the Cu-Cd alloy conductor wire has a loss of 20% of its load at break in tension while the wire conductor according to the present invention has only a loss in load at break of 5%.
- the result is that the common thread from manufacturing method according to the present invention presents a better thermal resistance with respect to a conductor wire Cu-Cd alloy.
- This cable 10 includes one hundred and forty two coaxial conductors distributed in eight groups (reference 12) of sixteen coaxial cables and seven pairs (reference 14) of coaxial cables.
- the set of cables coaxial cable is twisted around a central anti-wrenching fiber 16, the whole being wrapped in a ribbon 18 surrounded by the armor braid 20, itself protected by an outer sheath 22 made of plastic.
- the flexion aspect includes rotational movements with respect to a horizontal axis (X, X '), these movements being constituted by the passage of the sample 24 since a initial position 0 at position + 140 °, then its transition from position + 140 ° at the -140 ° position and finally its passage from the -140 ° position to the position initial 0.
- the sample 24 orthogonally crosses a horizontal beam 26 driven in rotation (non drive mechanism represented) and which imposes the movement previously described back and forth in rotation (arrow A in FIG. 2) around the horizontal axis (X, X ') which is parallel to the longitudinal direction of the beam 26.
- the twist aspect includes rotational movements with respect to an axis (Y, Y ') orthogonal to the axis horizontal (X, X '), these movements being constituted by the passage sample 24 from an initial position 0 to the position + 140 °, and then its passage from position + 140 ° to position -140 ° and finally its passage from the position -140 ° at the initial position 0.
- a torsion module 28 passes through the beam 26 according to the axis (Y, Y ') forming a pivot connection, a section of the sample 24 being housed integrally inside the torsion module 28 according to the axis (Y, Y ').
- a first end 24a of sample section protrudes from a first sleeve 28a surrounded by a stirrup 28a ', these two elements forming a first part of the module 28, and a second end 24b of the section of the sample exceeds a second sleeve 28b forming a second part of the module 28.
- the sample 24 is entirely subject to the movements of module 28, including the previously described movement of back and forth in rotation (arrows B in FIG. 2) about the axis (Y, Y ') (mechanism driving in rotation around (Y, Y ') not shown).
- the sample 24 of the cable is completely free of movement, so subject only to the gravity. This test makes it possible to reconstitute the requests to which a cable connected to a portable medical electrical appliance is subjected such as a probe.
- the thread resulting from the manufacturing process according to the The present invention thus appears to have a greater mechanical resistance, combined with better thermal resistance, while having a higher electrical conductivity than the conductor wires of the prior art.
- the present invention also relates to a braiding shield electromagnetic device for an electric cable, comprising at least one wire driver as defined above.
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Conductive Materials (AREA)
Description
- on fournit un fil de base réalisé dans ledit matériau composite,
- on réalise un revêtement du fil de base avec un matériau ductile afin d'obtenir un fil primaire présentant un diamètre nominal,
- on réalise le tréfilage dudit fil primaire pour aboutir à un fil secondaire présentant un diamètre final, et
- on réalise un traitement de recuit dudit fil secondaire afin de relâcher les contraintes induites par le tréfilage.
- dégraissage alcalin du fil de base,
- rinçage à l'eau du fil de base,
- décapage acide du fil de base,
- rinçage à l'eau du fil de base.
- dépôt par voie électrolytique d'une sous-couche d'argent sur le fil de base,
- dépôt par voie électrolytique d'une couche d'argent sur ladite sous-couche afin de former le fil primaire, et
- rinçage à l'eau du fil primaire.
- la figure 1 est une section transversale d'un câble utilisé pour effectuer des tests de résistance mécanique du fil conducteur objet de la présente invention,
- la figure 2 est une représentation schématique du test de tenue à la flexion et à la torsion mis en oeuvre, et
- la figure 3 est une courbe comparative de la tenue en flexion et en torsion du câble de la figure 1 selon qu'il utilise ou non le fil conducteur selon la présente invention.
- point de départ :position à 0° correspondant à une position verticale du câble, l'étrier 28a' étant en bas,
- flexion :280°/cycle,
- torsion : 280°/cycle,
- fréquence de cycle : 9 cycles/min,
- nombre de cycles : 1 000 000 au moins sans rupture de fil conducteur dans la tresse.
Claims (14)
- Procédé de fabrication d'un fil conducteur réalisé dans un matériau composite à matrice en cuivre dans laquelle sont dispersées des particules métalliques ou céramiques, caractérisé en ce qu'il comporte les étapes suivantes :on fournit un fil de base réalisé dans ledit matériau composite,on réalise un revêtement du fil de base avec un matériau ductile afin d'obtenir un fil primaire présentant un diamètre nominal,on réalise le tréfilage dudit fil primaire pour aboutir à un fil secondaire présentant un diamètre final, eton réalise un traitement de recuit dudit fil secondaire afin de relâcher les contraintes induites par le tréfilage.
- Procédé selon la revendication 1, caractérisé en ce que ledit matériau ductile appartient au groupe comprenant l'argent, l'or, le platine, le palladium et leurs alliages.
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que lesdites particules comportent de l'oxyde d'aluminium, de préférence de 0.2 à 0.4 % en poids du matériau composite.
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite étape de revêtement du fil de base comprend le dépôt par voie électrolytique d'une couche d'argent présentant une épaisseur comprise entre 1 et 10 µm, de préférence entre 3 et 6 µm.
- Procédé selon la revendication 4, caractérisé en ce que ladite étape de revêtement du fil de base comprend les étapes suivantes :dégraissage alcalin du fil de base,rinçage à l'eau du fil de base,décapage acide du fil de base,rinçage à l'eau du fil de base,dépôt par voie électrolytique d'une sous-couche d'argent sur le fil de base,dépôt par voie électrolytique d'une couche d'argent sur ladite sous-couche afin de former le fil primaire, etrinçage à l'eau du fil primaire.
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le tréfilage comprend plusieurs passages dans une machine de tréfilage multipasse à froid et permet l'obtention d'un diamètre final pour le fil secondaire au moins cinq fois plus petit que le diamètre nominal du fil primaire, de préférence sensiblement dix fois plus petit.
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que ledit traitement de recuit comporte le chauffage dudit fil secondaire entre 450 et 520°C pendant 150 à 210 minutes.
- Fil conducteur résultant du procédé de fabrication selon l'une quelconque des revendications 1 à 7, ce fil conducteur étant réalisé dans un matériau composite à matrice en cuivre dans laquelle sont dispersées des particules métalliques ou céramiques ce fil se caractérisant en ce qu'il comporte en outre un revêtement en matériau ductile et en ce qu'il présente une conductivité électrique au moins égale à 92% de la conductivité électrique du cuivre dénommée International Annealed Copper Standard correspondant à 1,7241 micro.ohm.cm à 20 °C.
- Procédé de fabrication d'une tresse de blindage électromagnétique (20) de câble (10) avec ledit fil conducteur, selon la revendication 8, caractérisé en ce que lorsque ledit câble (10) est soumis à un million (1.000.000) de cycles de flexion et de torsion combinées, chaque cycle correspondant, au passage d'un tronçon de câble par rapport à une position initiale, d'une part, pour la torsion (B), par rapport à une direction principale (Y, Y') du câble depuis une position 0°, vers une position à +140°, vers une position à -140° et le retour à la position 0°, et d'autre part, pour la flexion (A), par rapport à une direction (X, X') orthogonale à ladite direction principale du câble (Y, Y') depuis une position 0°, vers une position à +140°, vers une position à -140° et le retour à la position 0°, ladite tresse (20) présente une variation de résistance électrique maximale de 7%.
- Fil conducteur selon la revendication 8 caractérisé en ce qu'il présente une valeur de charge à la rupture en traction supérieure ou égale à 300 MPa.
- Fil conducteur selon la revendication 8, caractérisé en ce que ledit matériau ductile appartient au groupe comprenant l'argent, l'or, le platine, le palladium et leurs alliages.
- Fil conducteur selon la revendication 11, caractérisé en ce que ledit matériau ductile est une couche d'argent obtenue par voie électrolytique.
- Fil conducteur selon l'une quelconque des revendications 8 et 10 à 12, caractérisé en ce que lesdites particules comportent de l'oxyde d'aluminium, de préférence de 0.2 à 0.4 % en poids du matériau composite.
- Tresse de blindage électromagnétique (20) de câble électrique, comprenant au moins un fil conducteur selon l'une des revendications 8 et 10 à 13.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0001039 | 2000-01-27 | ||
FR0001039A FR2804539B1 (fr) | 2000-01-27 | 2000-01-27 | Procede de fabrication d'un fil conducteur realise dans un materiau composite a matrice en cuivre et fil conducteur obtenu par ledit procede |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1120797A1 EP1120797A1 (fr) | 2001-08-01 |
EP1120797B1 true EP1120797B1 (fr) | 2005-07-27 |
Family
ID=8846368
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01400151A Expired - Lifetime EP1120797B1 (fr) | 2000-01-27 | 2001-01-19 | Procédé de fabrication d'un fil conducteur réalisé dans un matériau composite à matrice en cuivre et fil conducteur obtenu par ledit procédé |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1120797B1 (fr) |
DE (1) | DE60112138T2 (fr) |
FR (1) | FR2804539B1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7789882B2 (en) | 2006-05-09 | 2010-09-07 | Kirwan Surgical Products, Inc. | Electrosurgical forceps with composite material tips |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3640779A (en) * | 1969-09-30 | 1972-02-08 | Olin Corp | High-conductivity copper alloys |
US4427469A (en) * | 1981-02-23 | 1984-01-24 | Western Electric Co., Inc. | Methods of and apparatus for controlling plastic-to-conductor adhesion of plastic-insulated, tinned conductors |
-
2000
- 2000-01-27 FR FR0001039A patent/FR2804539B1/fr not_active Expired - Fee Related
-
2001
- 2001-01-19 EP EP01400151A patent/EP1120797B1/fr not_active Expired - Lifetime
- 2001-01-19 DE DE2001612138 patent/DE60112138T2/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE60112138T2 (de) | 2006-04-13 |
DE60112138D1 (de) | 2005-09-01 |
EP1120797A1 (fr) | 2001-08-01 |
FR2804539A1 (fr) | 2001-08-03 |
FR2804539B1 (fr) | 2002-05-10 |
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