JP2008293894A - Manufacturing method of complex conductor, strand conductor, and cable using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a complex conductor with nearly the same conductivity as pure copper and more excellent flexibility than pure copper, and a stranded conductor, as well as a cable using the same. <P>SOLUTION: At an outer periphery of a core material made of pure copper or a copper alloy, a coating layer made of Ag or an Ag alloy is formed to make up a coated core material 2, on which 2, a batch system treatment is applied on given conditions to turn the above coated layer into a dispersion system constituted of a continuous phase consisting of a Cu phase and a dispersion phase consisting of an Ag phase. After that, a drawing process is applied on the coated core material with the heat treatment given to form a fiber dispersion layer 3 with metal fiber dispersed in a host phase at an outer layer part of the above coated core material 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for producing a composite conductor, a stranded conductor, and a cable using the same.

  Conventionally, as a coaxial cable used for a robot cable, an extra fine cable used for a medical probe cable, etc., a conductor made by plating a Cu or Cu alloy wire as a core wire has been used.

  In recent years, there is an increasing need for multi-core, thin diameter, and high conductivity for these cables and probe cables. Coaxial cables used for these cables are also required to have a smaller diameter, higher conductivity, and sufficient strength. The conductor used for the coaxial cable needs to have both high conductivity and high bending characteristics (bending resistance).

However, although the above-described Cu or Cu alloy wire has high conductivity, it does not have high bending resistance.
Therefore, a conductor having high conductivity and high bending resistance is desired in place of the conventional conductor using Cu or Cu alloy wire.

  As such a conventional high-strength, high-conductivity conductor (material), a Cu-metal fiber conductor (in) in which metals such as Ag, Nb, Cr, and Fe are dispersed in a fiber form in the entire Cu matrix as a core material. called a site alloy conductor). In particular, it is known that a conductor using a Cu-Ag alloy can be compatible at a high level of conductivity and strength.

  Further, as a composite conductor having high strength and high flexibility with such a conductor as a core material, Cu and inevitable impurities are formed on the outer periphery of the core material made of a Cu-Nb alloy, a Cu-Fe alloy, and a Cu-Ag alloy. A metal layer coated (see Patent Document 1), or a corrosion resistant layer made of Au, Ag, Sn, Ni, solder or the like formed on the outer periphery of a core material made of a parent phase (Cu) -metal fiber conductor (Patent Document) 2).

Japanese Patent Laid-Open No. 6-290639 JP 2001-176332 A JP 2006-127786 A

  However, these Cu-metal fiber conductors and the composite conductors described in Patent Documents 1 and 2 all have high bending resistance, but it is difficult to obtain conductivity sufficient to replace pure copper.

On the other hand, a coating layer made of Ag or an Ag alloy is formed on the outer periphery of a core material made of pure copper and a copper alloy, heat treatment is applied to the coated core material, wire drawing is performed, and an outer layer portion of the coated core material is applied There is a method for producing a composite conductor characterized by forming a fiber dispersion layer in which metal fibers are dispersed (see Patent Document 3).

  This is intended to form a two-phase structure of Ag phase and Cu phase in the outer layer portion of the coated core material by mutual diffusion of Ag of the coated layer and Cu of the core material by heat treatment.

  However, in the composite conductor manufacturing method of Patent Document 3, in the traveling heat treatment at 600 ° C. for 60 seconds, the mutual diffusion of the coating layer Ag and the core material Cu is insufficient, and a two-phase structure is not formed. In the traveling heat treatment at 1500 ° C. for 60 seconds, there is a concern that the coating layer may be peeled off due to mutual diffusion of Ag of the coating layer and Cu of the core material.

  Accordingly, an object of the present invention is to solve the above-mentioned problems, a method of manufacturing a composite conductor having a conductivity substantially equal to that of pure copper and having a bending resistance superior to that of pure copper, a stranded wire conductor, and a cable using the same Is to provide.

  In order to achieve the above object, the present invention forms a coated core material by forming a coating layer made of Ag or an Ag alloy on the outer periphery of a core material made of pure copper or a copper alloy, and batch-types the coated core material under predetermined conditions. After the heat treatment is performed to make the coating layer into a dispersed structure composed of a continuous phase composed of a Cu phase and a dispersed phase composed of an Ag phase, the coated core material subjected to the heat treatment is subjected to wire drawing to form the coated core material. The present invention provides a method for producing a composite conductor, wherein a fiber dispersion layer in which metal fibers are dispersed in a matrix phase is formed in an outer layer portion.

  The present invention forms a coated core material by forming a coating layer made of Ag or an Ag alloy on the outer periphery of a core material made of pure copper or a copper alloy, and the coated core material has a temperature of 600 ° C. or more and less than 700 ° C. for 30 minutes to 5 hours. After performing batch-type heat treatment to make the coating layer a dispersed structure composed of a continuous phase composed of a Cu phase and a dispersed phase composed of an Ag phase, the coated core material subjected to the heat treatment is subjected to wire drawing, The present invention provides a method for producing a composite conductor, wherein a fiber dispersion layer in which metal fibers are dispersed in a matrix phase is formed on an outer layer portion of a coated core material.

  In the present invention, a coated layer made of Ag or an Ag alloy is formed on the outer periphery of a core made of pure copper or a copper alloy to form a coated core, and the coated core is formed at a temperature of 700 ° C. or higher and lower than 800 ° C. for 5 minutes to After applying a 1 hr batch-type heat treatment to make the coating layer into a dispersed structure composed of a continuous phase composed of a Cu phase and a dispersed phase composed of an Ag phase, the coated core material subjected to the heat treatment is subjected to wire drawing. The present invention also provides a method for producing a composite conductor, wherein a fiber dispersion layer in which metal fibers are dispersed in a matrix phase is formed on an outer layer portion of a coated core material.

  This invention provides the manufacturing method of the composite conductor in any one of Claim 1 to 3 whose said copper alloy contains a trace amount additive of 1.0 mass% or less, and the remainder is Cu.

  In the present invention, the copper alloy contains one or more selected from Ag, Sn, In, Nb, Cr, Fe, P or B as the trace additive, and has a total concentration of 1.0 mass% or less. The composite conductor manufacturing method according to claim 4, wherein the remaining is Cu.

  This invention provides the manufacturing method of the composite conductor in any one of Claim 1 to 5 which forms the coating layer which consists of said Ag or Ag alloy by plating.

  In the present invention, a plating layer made of Sn, Ag, or Ni is formed on the outer periphery of the composite conductor obtained by the manufacturing method according to any one of claims 1 to 6, and the plating layer is formed. The present invention provides a stranded wire conductor characterized in that a plurality of composite conductors are twisted together.

  The present invention provides a cable characterized in that the stranded wire conductor according to claim 7 is a core wire, an outer conductor is disposed around the core wire, and a jacket layer is provided to cover the outer conductor. is there.

  In the present invention, a resin layer is formed on the outer periphery of the composite conductor obtained by the manufacturing method according to any one of claims 1 to 6 to form a core wire, and an outer conductor is disposed around the core wire. The present invention provides a cable characterized in that a jacket layer covering the outer conductor is provided.

  According to the present invention, it is possible to produce an excellent effect that it is possible to produce a composite conductor having a conductivity substantially equal to that of pure copper and having bending resistance superior to that of pure copper.

  Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  The gist of the present invention is that, in a coated core material in which a coating layer made of Ag or an Ag alloy is formed on the outer periphery of a core material made of pure copper and a copper alloy, Ag of the coating layer and Cu of the core material are mutually diffused by batch-type heat treatment. And creating a two-phase structure that is the basis of the fiber dispersion layer.

  Here, the two-phase structure formed by interdiffusion by heat treatment includes a layered structure in which the Ag phase and the Cu phase shown in FIG. 4 are formed in layers, and the Ag phase and the Cu phase shown in FIG. There is a two-phase separated structure (two-phase dispersed structure) formed by fine separation.

  4 and 5 are SEM images (5000 magnifications) of the two-phase structure formed by batch heat treatment. The heat treatment conditions in FIG. 4 are 1 hour at a temperature of 500 ° C., and the heat treatment conditions in FIG. The temperature is 5 hr.

  The inventors of the present application have found that the two-phase structure that can be the basis of the fiber dispersion layer is the latter two-phase separated structure shown in FIG. 5, and in order to form the two-phase separated structure, It has been found that the core material needs to be subjected to batch heat treatment under predetermined conditions.

  The two-phase separated structure is not particularly limited to this. For example, the ratio of the Cu phase and the Ag phase in the two-phase separated structure is such that the volume ratio of the Cu phase is 73% to 77% and the volume ratio of Ag is 23% to 27%.

  The manufacturing method of the composite conductor of this embodiment is demonstrated.

  First, a wire made of pure copper (or a copper alloy) is formed as a core material.

  Here, as a copper alloy, what contains 1.0 mass% or less of trace additives and the remainder is Cu can be considered. Moreover, as a trace additive, 1 type, or 2 or more types selected from Ag, Sn, In, Nb, Cr, Fe, P, or B can be considered.

  Next, a coating layer made of Ag (or an Ag alloy) is formed on the outer periphery of the core material (wire material) with a thickness thicker than the fiber dispersion layer to be finally formed. Examples of the method for forming the coating layer include an electroplating method and a solution plating method.

  Next, the coated core material (hereinafter referred to as the coated core material) is subjected to heat treatment. Examples of the heat treatment include batch-type heat treatment for 30 min to 5 hr at a temperature of 600 ° C. to less than 700 ° C., and batch-type heat treatment for 5 min to 1 hr at a temperature of 700 ° C. to less than 800 ° C.

  Here, the processing conditions of the batch type heat treatment were set to 30 min to 5 hr at a temperature of 600 ° C. or more and less than 700 ° C. or 5 min to 1 hr at a temperature of 700 ° C. or more to less than 800 ° C. This is because even if the diffusion is insufficient and mutual diffusion becomes insufficient, or even if mutual diffusion occurs, a layered structure in which the Ag phase and the Cu phase shown in FIG. 4 are formed in layers is formed.

  By this heat treatment, the coating layer Ag and the core material Cu diffuse to each other. In the vicinity of the boundary surface between the coating layer and the core material, the number of Cu atoms is overwhelmingly larger than that of Ag atoms, so that Ag atoms diffuse into the Cu phase. Thereafter, an Ag phase is precipitated from the Cu phase that has become a supersaturated solid solution. On the other hand, since there are more Ag atoms near the surface than Cu atoms, Cu atoms diffuse into the Ag phase, and the Cu phase is precipitated from the Ag phase that has become a supersaturated solid solution. As described above, a two-phase structure in which the Ag phase and the Cu phase that are the basis of the fiber dispersion layer are finely separated is formed in the outer layer portion of the coated core material.

  Next, the coated core material after the heat treatment is drawn. By this wire drawing, Ag precipitated in the Cu phase is stretched in the form of fibers in the longitudinal direction of the coated core material and dispersed as metal fibers (reinforcing material) in the Cu matrix (matrix).

  By the above, the composite conductor by which the fiber dispersion layer in which Ag fiber was disperse | distributed in Cu mother phase was formed in the outer layer part of a covering core material can be obtained.

  Next, the composite conductor obtained by the manufacturing method of this embodiment will be described based on FIG.

  FIG. 1 shows a cross-sectional view of the composite conductor of this embodiment.

  As shown in FIG. 1, the composite conductor 1 obtained by the manufacturing method of the present invention forms a fiber dispersion layer 3 in which metal fibers are dispersed in the matrix phase on the outer periphery of a core material 2 made of pure copper (or copper alloy). It is a thing.

  The preferable wire diameter of the composite conductor 1 obtained by the manufacturing method of the present invention is 0.2 mm or less. The layer thickness of the fiber dispersion layer 3 of the composite conductor 1 obtained by the production method of the present invention is 0.3% or more of the diameter of the composite conductor, preferably 0.5% to 8%, more preferably 1% to It has a layer thickness of 5%.

  Moreover, the preferable wire diameter of a covering core material is 3.0 mm or less. The layer thickness of the covering layer is 0.3% or more of the diameter of the covering core material, preferably 0.5% to 8%, more preferably 1% to 5%.

  The effect | action of the composite conductor 1 of this embodiment is demonstrated.

  When the composite conductor 1 is bent, the distortion caused by the bending is larger toward the outer side in the radial direction, and a larger load is applied to the outer layer portion of the composite conductor 1 as compared to the center portion. In this embodiment, the large load is applied to the fiber dispersion layer 3 having a high bending property but poor conductivity, and the core material 2 having a high conductivity but poor bending property is hardly loaded.

  Further, the fiber dispersion layer 3 is thin, and the ratio of the fiber dispersion layer 3 in the cross-sectional area of the composite conductor 1 is very small compared to the core material 2. Therefore, there is almost no decrease in the conductivity of the composite conductor 1 due to the fiber dispersion layer 3.

  Thus, the composite conductor 1 obtained by the present invention can obtain high flexibility and high electrical conductivity by forming the fiber dispersion layer 3 in the outer layer portion of the core material 2.

  In other words, the composite conductor 1 obtained by the present invention has a structure in which the strength of the outer layer portion is increased by the fiber dispersion layer 3 so that the conductor is composed of pure copper (core material) while maintaining substantially the same conductivity as that of pure copper. Compared to this, it is possible to achieve a significantly higher bending resistance.

  Next, a cable in which the outer conductor is arranged around the core wire and the core wire is composed of the composite conductor of the present embodiment will be described with reference to FIG.

  As shown in FIG. 2, the cable 21 includes a core wire formed by the composite conductor 1 shown in FIG. 1 (hereinafter denoted by reference numeral 1 in FIG. 2) and an outer conductor disposed around the core wire 1. 23. Further, the cable 21 includes a resin layer 24 formed on the outer periphery of the core wire 1 and a jacket layer 25 formed on the outer periphery of the external conductor 23.

  The outer conductor 23 is composed of a plurality of (15 in FIG. 2) wire rods 23a that are joined together with the core wire 1 as the center. Examples of the constituent material of the wire 23a include a Cu alloy (for example, Cu-0.15 mass% Sn alloy), and the use of the composite conductor 1 shown in FIG.

  Since the cable 21 of the present embodiment is formed by the composite conductor 1 shown in FIG. 1, the cable 21 can have high conductivity and high bending resistance even though it has a small diameter. Even when the present invention is applied to the outer conductor, the same effect as described above can be obtained.

  Next, a stranded wire conductor using the composite conductor of the present embodiment and a cable using the stranded wire conductor will be described with reference to FIG.

  The cable of FIG. 3 is different from the cable 21 of FIG. 2 in the configuration of the core wire, and the other is substantially the same. Therefore, the same elements as those of the cable 21 in FIG. 2 are designated by the same reference numerals in the drawing, and detailed description thereof is omitted.

  In FIG. 2 described above, an example using a single core wire has been described. However, as shown in FIG. 3, from the viewpoint of improving the bending resistance of the cable 31, the core wire 32 includes the composite conductor 1. A stranded wire structure (stranded wire conductor) in which a plating layer 36 made of any of Sn, Ag, and Ni is formed on the outer periphery, and a plurality of (for example, seven) composite conductors 1 formed with the plating layer 36 are twisted together. It is also possible to adopt it (FIG. 3B).

  As shown in FIG. 3A, the cable 31 is formed by using a stranded conductor as a core wire 32 and arranging an external conductor 23 around the core wire 32.

  According to the cable 31 of FIG. 3, high conductivity can be obtained similarly to the cable 21 of FIG. 2, and furthermore, higher bending resistance can be obtained than the cable 21 of FIG.

  As described above, the composite conductor 1 of the present invention is a conductor such as a signal transmission / reception line in a signal transmission / reception system in a transmission field such as an internal wiring for a personal computer, an internal wiring for a mobile phone, a medical signal line, or mobile communication. Can be applied as

  Further, the cables 21 and 31 using the composite conductor 1 of the present invention can be applied to a multi-core cable or the like for obtaining a high-precision image such as an ultrasonic diagnostic probe cable.

  In addition, this invention is not limited to the above-mentioned embodiment, Various modifications and application examples can be considered.

  In order to obtain the above-mentioned composite conductor, necessary heat treatment conditions were investigated using Examples, Comparative Examples, and Conventional Examples as follows.

The heat treatment of the conventional example was a traveling heat treatment, and the heat treatment of the present invention and the comparative example was a batch heat treatment. Moreover, the heat processing of an Example and a comparative example was implemented on the conditions of the temperature range of 5 min-24 hr in the temperature range of 500 to 800 degreeC.
Example 1
Electric Ag plating was applied to the outer periphery of a φ2.6 mm wire made of OFC (oxygen-free copper) as a core material, and an Ag coating layer (plating layer) was formed to a thickness of 13 μm on the outer periphery of the core material. This coated core material was subjected to batch heat treatment at 600 ° C. for 30 minutes, and then cold drawn to produce a φ0.1 mm composite conductor having a fiber dispersion layer with a layer thickness of 0.5 μm on the outer periphery.
(Example 2)
Electric Ag plating was applied to the outer periphery of a φ2.6 mm wire made of OFC as a core material, and an Ag coating layer (plating layer) was formed to a thickness of 13 μm on the outer periphery of the core material. The coated core material was subjected to batch heat treatment at 600 ° C. for 1 hour, and then cold-drawn to produce a φ0.1 mm composite conductor having a fiber dispersion layer with a layer thickness of 0.5 μm on the outer periphery.
(Example 3)
Electric Ag plating was applied to the outer periphery of a φ2.6 mm wire made of OFC as a core material, and an Ag coating layer (plating layer) was formed to a thickness of 13 μm on the outer periphery of the core material. This coated core was subjected to batch heat treatment at 600 ° C. for 2 hours, and then cold drawn to produce a φ0.1 mm composite conductor having a fiber dispersion layer with a layer thickness of 0.5 μm on the outer periphery.
Example 4
Electric Ag plating was applied to the outer periphery of a φ2.6 mm wire made of OFC as a core material, and an Ag coating layer (plating layer) was formed to a thickness of 13 μm on the outer periphery of the core material. This coated core was subjected to batch-type heat treatment at 600 ° C. for 5 hours, and then cold-drawn to produce a φ0.1 mm composite conductor having a fiber dispersion layer with a layer thickness of 0.5 μm on the outer periphery.
(Example 5)
Electric Ag plating was applied to the outer periphery of a φ2.6 mm wire made of OFC as a core material, and an Ag coating layer (plating layer) was formed to a thickness of 13 μm on the outer periphery of the core material. The coated core material was subjected to batch heat treatment at 650 ° C. for 15 min, and then cold drawn to produce a φ0.1 mm composite conductor having a fiber dispersion layer with a layer thickness of 0.5 μm on the outer periphery.
(Example 6)
Electric Ag plating was applied to the outer periphery of a φ2.6 mm wire made of OFC as a core material, and an Ag coating layer (plating layer) was formed to a thickness of 13 μm on the outer periphery of the core material. This coated core was subjected to batch-type heat treatment at 650 ° C. for 45 min and then cold drawn to produce a φ0.1 mm composite conductor having a fiber dispersion layer with a layer thickness of 0.5 μm on the outer periphery.
(Example 7)
Electric Ag plating was applied to the outer periphery of a φ2.6 mm wire made of OFC as a core material, and an Ag coating layer (plating layer) was formed to a thickness of 13 μm on the outer periphery of the core material. The coated core material was subjected to batch heat treatment at 650 ° C. for 90 minutes, and then cold-drawn to produce a φ0.1 mm composite conductor having a fiber dispersion layer with a layer thickness of 0.5 μm on the outer periphery.
(Example 8)
Electric Ag plating was applied to the outer periphery of a φ2.6 mm wire made of OFC as a core material, and an Ag coating layer (plating layer) was formed to a thickness of 13 μm on the outer periphery of the core material. This coated core was subjected to batch heat treatment at 650 ° C. for 3 hours, and then cold drawn to produce a φ0.1 mm composite conductor having a fiber dispersion layer with a layer thickness of 0.5 μm on the outer periphery.
Example 9
Electric Ag plating was applied to the outer periphery of a φ2.6 mm wire made of OFC as a core material, and an Ag coating layer (plating layer) was formed to a thickness of 13 μm on the outer periphery of the core material. This coated core was subjected to batch-type heat treatment at 700 ° C. for 10 minutes, and then cold-drawn to produce a φ0.1 mm composite conductor having a fiber dispersion layer with a layer thickness of 0.5 μm on the outer periphery.
(Example 10)
Electric Ag plating was applied to the outer periphery of a φ2.6 mm wire made of OFC as a core material, and an Ag coating layer (plating layer) was formed to a thickness of 13 μm on the outer periphery of the core material. The coated core material was subjected to batch heat treatment at 700 ° C. for 30 min, and then cold drawn to produce a φ0.1 mm composite conductor having a fiber dispersion layer with a layer thickness of 0.5 μm on the outer periphery.
(Example 11)
Electric Ag plating was applied to the outer periphery of a φ2.6 mm wire made of OFC as a core material, and an Ag coating layer (plating layer) was formed to a thickness of 13 μm on the outer periphery of the core material. This coated core material was subjected to batch heat treatment at 700 ° C. for 1 hr, and then cold drawn to produce a φ0.1 mm composite conductor having a fiber dispersion layer with a layer thickness of 0.5 μm on the outer periphery.
(Example 12)
Electric Ag plating was applied to the outer periphery of a φ2.6 mm wire made of OFC as a core material, and an Ag coating layer (plating layer) was formed to a thickness of 13 μm on the outer periphery of the core material. This coated core was subjected to batch-type heat treatment at 750 ° C. for 5 minutes, and then cold-drawn to produce a φ0.1 mm composite conductor having a fiber dispersion layer with a layer thickness of 0.5 μm on the outer periphery.
(Example 13)
Electric Ag plating was applied to the outer periphery of a φ2.6 mm wire made of OFC as a core material, and an Ag coating layer (plating layer) was formed to a thickness of 13 μm on the outer periphery of the core material. This coated core material was subjected to batch heat treatment at 750 ° C. for 15 min, and then cold-drawn to produce a φ0.1 mm composite conductor having a fiber dispersion layer with a layer thickness of 0.5 μm on the outer periphery.
(Example 14)
Electric Ag plating was applied to the outer periphery of a φ2.6 mm wire made of OFC as a core material, and an Ag coating layer (plating layer) was formed to a thickness of 13 μm on the outer periphery of the core material. This coated core was subjected to batch-type heat treatment at 750 ° C. for 45 min and then cold drawn to produce a φ0.1 mm composite conductor having a fiber dispersion layer with a layer thickness of 0.5 μm on the outer periphery.
(Comparative Example 1)
Electric Ag plating was applied to the outer periphery of a φ2.6 mm wire made of OFC as a core material, and an Ag coating layer (plating layer) was formed to a thickness of 13 μm on the outer periphery of the core material. The coated core material was subjected to batch heat treatment at 500 ° C. for 10 minutes, and then cold-drawn to produce a φ0.1 mm composite conductor having an outer layer with a layer thickness of 0.5 μm on the outer periphery.
(Comparative Example 2)
Electric Ag plating was applied to the outer periphery of a φ2.6 mm wire made of OFC as a core material, and an Ag coating layer (plating layer) was formed to a thickness of 13 μm on the outer periphery of the core material. This coated core material was subjected to batch heat treatment at 500 ° C. for 30 min, and then cold drawn to produce a φ0.1 mm composite conductor having an outer layer with a layer thickness of 0.5 μm on the outer periphery.
(Comparative Example 3)
Electric Ag plating was applied to the outer periphery of a φ2.6 mm wire made of OFC as a core material, and an Ag coating layer (plating layer) was formed to a thickness of 13 μm on the outer periphery of the core material. This coated core was subjected to batch heat treatment at 500 ° C. for 1 hr, and then cold drawn to produce a φ0.1 mm composite conductor having an outer layer with a layer thickness of 0.5 μm on the outer periphery.
(Comparative Example 4)
Electric Ag plating was applied to the outer periphery of a φ2.6 mm wire made of OFC as a core material, and an Ag coating layer (plating layer) was formed to a thickness of 13 μm on the outer periphery of the core material. The coated core material was subjected to batch heat treatment at 500 ° C. for 2 hours, and then cold-drawn to produce a φ0.1 mm composite conductor having an outer layer with a layer thickness of 0.5 μm on the outer periphery.
(Comparative Example 5)
Electric Ag plating was applied to the outer periphery of a φ2.6 mm wire made of OFC as a core material, and an Ag coating layer (plating layer) was formed to a thickness of 13 μm on the outer periphery of the core material. The coated core material was subjected to batch heat treatment at 500 ° C. for 5 hours, and then cold drawn to produce a φ0.1 mm composite conductor having a fiber dispersion layer with a layer thickness of 0.5 μm on the outer periphery.
(Comparative Example 6)
Electric Ag plating was applied to the outer periphery of a φ2.6 mm wire made of OFC as a core material, and an Ag coating layer (plating layer) was formed to a thickness of 13 μm on the outer periphery of the core material. This coated core was subjected to batch-type heat treatment at 500 ° C. for 10 hours and then cold drawn to produce a φ0.1 mm composite conductor having an outer layer with a layer thickness of 0.5 μm on the outer periphery.
(Comparative Example 7)
Electric Ag plating was applied to the outer periphery of a φ2.6 mm wire made of OFC as a core material, and an Ag coating layer (plating layer) was formed to a thickness of 13 μm on the outer periphery of the core material. This coated core was subjected to batch heat treatment at 500 ° C. for 24 hours, and then cold drawn to produce a φ0.1 mm composite conductor having an outer layer with a layer thickness of 0.5 μm on the outer periphery.
(Comparative Example 8)
Electric Ag plating was applied to the outer periphery of a φ2.6 mm wire made of OFC as a core material, and an Ag coating layer (plating layer) was formed to a thickness of 13 μm on the outer periphery of the core material. The coated core material was subjected to batch heat treatment at 600 ° C. for 10 minutes, and then cold-drawn to produce a φ0.1 mm composite conductor having an outer layer with a layer thickness of 0.5 μm on the outer periphery.
(Comparative Example 9)
Electric Ag plating was applied to the outer periphery of a φ2.6 mm wire made of OFC as a core material, and an Ag coating layer (plating layer) was formed to a thickness of 13 μm on the outer periphery of the core material. This coated core was subjected to batch heat treatment at 600 ° C. for 10 hours, and then cold-drawn to produce a φ0.1 mm composite conductor having an outer layer with a layer thickness of 0.5 μm on the outer periphery.
(Comparative Example 10)
Electric Ag plating was applied to the outer periphery of a φ2.6 mm wire made of OFC as a core material, and an Ag coating layer (plating layer) was formed to a thickness of 13 μm on the outer periphery of the core material. This coated core was subjected to batch heat treatment at 600 ° C. for 24 hours, and then cold drawn to produce a φ0.1 mm composite conductor having an outer layer with a layer thickness of 0.5 μm on the outer periphery.
(Comparative Example 11)
Electric Ag plating was applied to the outer periphery of a φ2.6 mm wire made of OFC as a core material, and an Ag coating layer (plating layer) was formed to a thickness of 13 μm on the outer periphery of the core material. This coated core was subjected to batch heat treatment at 700 ° C. for 2 hours.
(Comparative Example 12)
Electric Ag plating was applied to the outer periphery of a φ2.6 mm wire made of OFC as a core material, and an Ag coating layer (plating layer) was formed to a thickness of 13 μm on the outer periphery of the core material. This coated core was subjected to batch heat treatment at 700 ° C. for 5 hours.
(Comparative Example 13)
Electric Ag plating was applied to the outer periphery of a φ2.6 mm wire made of OFC as a core material, and an Ag coating layer (plating layer) was formed to a thickness of 13 μm on the outer periphery of the core material. This coated core was subjected to batch heat treatment at 700 ° C. for 10 hours.
(Comparative Example 14)
Electric Ag plating was applied to the outer periphery of a φ2.6 mm wire made of OFC as a core material, and an Ag coating layer (plating layer) was formed to a thickness of 13 μm on the outer periphery of the core material. This coated core was subjected to batch heat treatment at 700 ° C. for 24 hours.
(Comparative Example 15)
Electric Ag plating was applied to the outer periphery of a φ2.6 mm wire made of OFC as a core material, and an Ag coating layer (plating layer) was formed to a thickness of 13 μm on the outer periphery of the core material. This coated core was subjected to batch heat treatment at 800 ° C. for 10 minutes.
(Conventional example 1)
Electric Ag plating was applied to the outer periphery of a φ2.6 mm wire made of OFC as a core material, and an Ag coating layer (plating layer) was formed to a thickness of 13 μm on the outer periphery of the core material. The coated core material was subjected to traveling heat treatment at 600 ° C. for 60 seconds.
(Conventional example 2)
Electric Ag plating was applied to the outer periphery of a φ2.6 mm wire made of OFC as a core material, and an Ag coating layer (plating layer) was formed to a thickness of 13 μm on the outer periphery of the core material. The coated core material was subjected to traveling heat treatment at 1500 ° C. for 60 seconds.

  In Table 1, the heat treatment temperature and heat treatment time of Examples 1 to 14, Comparative Examples 1 to 15, and Conventional Examples 1 and 2, the presence or absence of mutual diffusion, the formed two-phase structure, the presence or absence of peeling of the coating layer, And overall evaluation.

  Regarding the two-phase structure shown in Table 1, the one in which a two-phase separated structure (dispersed structure) in which the Ag phase and the Cu phase as the basis of the fiber dispersion layer were finely separated was formed, and the others were evaluated as x. Comprehensive evaluation is that the above two-phase separated structure is formed. ◎ Although the two-phase separated structure is formed, a minute gap (at the interface) due to the interdiffusion occurring between the coating layer Ag and the core material Cu. The case where a void was generated was marked with ◯, and the others were marked with x.

  As shown in Table 1, in the heat treatment conditions of Examples 1 to 14, mutual diffusion occurs between the coating layer Ag and the core material Cu, and the Ag phase and the Cu phase that are the basis of the fiber dispersion layer after the wire drawing process are A finely separated two-phase separated structure was formed in the outer layer portion of the coated core material. However, under the heat treatment conditions of Examples 3, 4, 7, 8, 11, and 14, minute gaps (voids) were generated at the interface due to interdiffusion that occurred between the coating material Ag and the core material Cu.

  On the other hand, in the heat treatment conditions of Comparative Examples 1, 2, 8 and Conventional Example 1, mutual diffusion occurred between the coating layer Ag and the core material Cu, but the diffusion of the coating layer Ag and the core material Cu was insufficient. In addition, a two-phase separated structure of Ag phase and Cu phase is not formed in the outer layer portion of the coated core material, and it is difficult to form a fiber dispersion layer on the outer periphery even when wire drawing is performed. Moreover, in the prior art example 1, the coating layer Ag and the core material Cu were peeled off.

  In the heat treatment conditions of Comparative Examples 3 to 7, interdiffusion occurred between the coating layer Ag and the core material Cu. However, since a layered structure in which the Ag phase and the Cu phase were formed in layers was formed, the wire drawing was performed. However, a fiber dispersion layer cannot be obtained on the outer periphery.

  Under the heat treatment conditions of Comparative Examples 9 and 10, interdiffusion occurred between the coating layer Ag and the core material Cu. However, under this heat treatment condition, the diffusion of Cu progressed to the outer layer portion, and the wire drawing was performed. However, a fiber dispersion layer cannot be obtained on the outer periphery.

  In the heat treatment conditions of Comparative Examples 11 to 15 and Conventional Example 2, interdiffusion occurred between the coating layer Ag and the core material Cu, but the coating layer Ag and the core material Cu were peeled off.

  Next, Table 2 shows the conductivity (% IACS), flex life (times), and overall evaluation for Example 1 and Comparative Example 5.

  The bending test is the same as in Example 1, with the wire rod of Example 1 and Comparative Example 5 repeated bending at 90 ° to the left and right at a bending r = 5 mm (bending strain 1%), and the number of bendings until breakage is defined as the bending life. In Table 2, ◯ is indicated as “good” when 3 times or more of the bending life of the soft TPC wire composed of the wire diameter is passed and 3 times or less is rejected. In the comprehensive evaluation, “Excellent” was evaluated as “Good”, and “No” was evaluated as “Poor”.

  As shown in Table 2, the wire of Example 1 has a low electrical conductivity of 98% IACS because the concentration of the additive contained in the core material is low, and the fiber dispersion layer is provided. The lifetime was acceptable and good. From the above, the overall evaluation was excellent. That is, it had substantially the same conductivity as pure copper and a sufficient bending life.

  On the other hand, although the electrical conductivity of the wire of Comparative Example 5 was as good as 98% IACS, the flex life did not reach the acceptable level because the fiber dispersion layer was not provided. As a result, overall evaluation is not good.

FIG. 1 is a cross-sectional view of a composite conductor manufactured by the manufacturing method according to the present invention. FIG. 2 is a cross-sectional view of a cable using the composite conductor of the present embodiment. FIG. 3A is a cross-sectional view of a cable using a stranded wire conductor made of the composite conductor of the present embodiment, and FIG. 3B is a cross-sectional view of a stranded wire conductor using the composite conductor of the present embodiment. FIG. FIG. 4 is an SEM image of a two-phase structure, showing a layered structure. FIG. 5 is an SEM image of a two-phase structure, showing a dispersed structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Composite conductor 2 Core material 3 Fiber dispersion layer 21, 32 Cable 23 Outer conductor 24 Resin layer 25 Jacket layer 32 Core wire

Claims (9)

  A coating layer made of Ag or an Ag alloy is formed on the outer periphery of a core material made of pure copper or a copper alloy to form a coating core material, and the coating core material is subjected to batch-type heat treatment under predetermined conditions, and the coating layer is made from a Cu phase. After forming a dispersed structure composed of a continuous phase and a dispersed phase composed of an Ag phase, the coated core material subjected to the heat treatment is subjected to wire drawing to disperse the metal fibers in the matrix phase in the outer layer portion of the coated core material. A method for producing a composite conductor, comprising forming a dispersed fiber layer.   A coating layer made of Ag or an Ag alloy is formed on the outer periphery of a core material made of pure copper or a copper alloy to form a coating core material, and the coated core material is subjected to batch-type heat treatment at a temperature of 600 ° C. or more and less than 700 ° C. for 30 minutes to 5 hours. The coating layer is made into a dispersed structure composed of a continuous phase composed of a Cu phase and a dispersed phase composed of an Ag phase, and then the coated core material subjected to the heat treatment is subjected to wire drawing to form an outer layer of the coated core material. Forming a fiber dispersion layer in which metal fibers are dispersed in a matrix in a part.   A coating layer made of Ag or an Ag alloy is formed on the outer periphery of a core material made of pure copper or a copper alloy to form a coating core material, and the coated core material is subjected to batch type heat treatment at a temperature of 700 ° C. or more and less than 800 ° C. for 5 minutes to 1 hour. After the coating layer is made into a dispersed structure composed of a continuous phase composed of a Cu phase and a dispersed phase composed of an Ag phase, the coated core material subjected to the heat treatment is subjected to wire drawing, and the outer layer portion of the coated core material And forming a fiber dispersion layer in which metal fibers are dispersed in the matrix.   The method for producing a composite conductor according to any one of claims 1 to 3, wherein the copper alloy contains a trace additive of 1.0 mass% or less, and the remainder is Cu.   The copper alloy contains, as the trace additive, one or more selected from Ag, Sn, In, Nb, Cr, Fe, P or B at a total concentration of 1.0 mass% or less, The method for producing a composite conductor according to claim 4, wherein the remainder is Cu.   The method for producing a composite conductor according to claim 1, wherein the coating layer made of Ag or an Ag alloy is formed by plating.   A plating layer made of Sn, Ag, or Ni is formed on the outer periphery of the composite conductor obtained by the manufacturing method according to any one of claims 1 to 6, and the composite conductor on which the plating layer is formed is formed. A stranded conductor characterized by a plurality of twisted wires.   A cable comprising a stranded conductor according to claim 7 as a core, an outer conductor disposed around the core, and a jacket layer covering the outer conductor.   A resin layer is formed on the outer periphery of the composite conductor obtained by the manufacturing method according to any one of claims 1 to 6 to form a core wire, an outer conductor is disposed around the core wire, and the outer conductor is A cable characterized by providing a covering jacket layer.

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