JPS6123516A - Manufacture of complex material heat resistant, high strength, and high conductivity - Google Patents

Abstract

PURPOSE:To attain a high quality complex material heat resistance, high strength, and high electric conductivity by placing aluminum coated copper powder in a copper cylinder to form a billet for extrusion, thence after degressive processing by high temperature hydrostatic pressure extrusion, carrying out cold working. CONSTITUTION:Al coated copper powder 3 is filled in a thick walled copper cylinder 2 and a head 4 having oppening 5 communicating with the open end of the cylinder 2 is connected to said cylinder and a billet 1 for extrusion is obtd. After heating this billet 1 to high temperature, the head part 4 is inserted into a container 6 of a hydrostatic extruding machine so as the head directs to the die side 7 and high temp. hydrostatical extrusion is executed. By this degression process, the extruded material 9 having a dispersion strengthened type copper alloy having a core 11 enwrapped with an outer skin 10 is obtained. The necessary cold processing is performed to give the complex material and further electrode tips or the like are formed. By this method with simplified process, high quality heat resistant, high strength and high conductive complex material is suitably manufactured.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is directed to the production of a composite material in which a high-quality dispersion-strengthened copper alloy is arranged in the core, and the core is covered with a copper shell. Regarding the method.

<Prior art> Materials used for spot welding electrode tips and 200-300°C
Motor windings @ C @ diameter = 00 ° 5 ~ i LOsm ) used in high-temperature atmospheres, lead wires for electronic and electrical components (e.g. diodes, transistors, reed switches, etc.), shafts for power source wLs (shaft diameter: Da 6 (about 1W)
All wire rods used in such applications are required to have heat resistance, high strength, and high conductivity, but no material that fully combines these properties has yet been developed.

For example, Cu-C! r, On-Zr
Alloys are commonly used and commercially available because they have excellent electrical conductivity, thermal conductivity, and mechanical strength. The shape had to be corrected and the electrode tips had to be replaced frequently, resulting in a decrease in productivity.

Therefore, a composite electrode chip in which a dispersion-strengthened copper alloy having relatively good electrical conductivity and particularly excellent high-temperature strength is disposed in the chip core was disclosed in Japanese Patent Application No. 47-23426. A method for manufacturing the next electrode chip with improved quality was disclosed in Japanese Patent Application Laid-Open No. 14559/1983 (hereinafter referred to as "prior art"). In this method, a cylindrical case of precipitation hardening copper alloy is filled with strips of dispersion-strengthened copper alloy obtained by internal oxidation method and sealed to form a composite extruded billet, and the billet is heated. In this method, an electrode chip material is obtained by extrusion, and required mechanical processing is performed on this material.

On the other hand, composite wires made of steel wire coated with copper are used as wire materials that require high heat resistance and strength, but the conductivity is 40%.
~80 * Since the ImC8 is low, pure copper and copper alloys are used for wire materials that require high heat resistance and high strength and high conductivity of 9096ImC8 or higher, at the expense of all heat resistance and high strength. It's sudden.

For example, lead wire terminals for electronic and electrical components such as diodes and transistors are required to have high strength and high conductivity from the viewpoint of high sensitivity and weight reduction.
Although processes such as diffusion bonding that are exposed to high temperatures of 600 to 800°C require P1 heat resistance, there is currently no material that has both of these properties, so copper@ has no choice but to be used. This is an unprofitable situation.

<Problems to be Solved by the Invention> In the case of electrode tips, the lifespan of the electrode tips is improved compared to conventional Ou-Or gold alloys by the conventional method;
Based on the dispersion-strengthened copper alloy strips obtained by the internal oxidation method, dispersion-strengthened copper alloy is re-formed in the core of the outer periphery of the precipitation-hardened copper alloy. Since the defects do not remain in the dispersion-strengthened copper alloy of the t-core, they do not adversely affect the life of the electrode tip.

As is well known, the internal oxidation method is a method in which the melted copper alloy material is made into a powder or strip shape by atomizing or cutting, and then the alloy components such as aluminum are oxidized inside. It is difficult to obtain high-quality dispersion-strengthened copper-gold produced by this method because of the difficulty in achieving stability and the difficulty in removing impurities from the melted base material.

In addition, in billet extrusion, in the direct extrusion method,
As disclosed in the conventional example, the outer diameter is 0.92 and the inner diameter (filling part diameter) is J! When extruding a billet of l' 34.5 tm, the outer diameter is 719 and the core diameter is 9fi.Although the filling rate of the dispersion-strengthened copper alloy in the core is improved, the area of the core is The percentage increased from 14.1% to 22.496,
It is not possible to obtain FC composite material with stable quality.

Furthermore, when a billet is made into a sealed structure, it is customary to degas the billet as disclosed in the conventional example, but the present inventors have learned from experience that this degassing and sealing means They have doubts about the reliability of brazing, welding, pressure welding, etc.
When heated to 0° C., the material bulges and deforms during heating, and we often experience the operational trouble of not being able to insert it into an extrusion container. In order to completely release the gas, it is necessary to degas the gas for a long time under high vacuum, but this method lacks industrial productivity.

Furthermore, the outer periphery surrounding the core, which is a dispersion-strengthened copper alloy, uses a precipitation-hardening copper alloy, so in order to give strength to the tip, heat treatment is applied as a precipitation process. This makes the manufacturing process complicated.

On the other hand, if a material such as O, which only satisfies high conductivity, is used for a wire that requires heat resistance, high strength, and high conductivity, the wire will not be able to withstand the strength, so deformations such as deflection and bending will occur during manufacturing. . In the example of the lead wire terminal on the slant, such deformation requires a lot of man-hours to correct, which poses a problem in terms of efficiency and cost. In view of the problem of the slant, the present invention has The purpose is to provide a simple and easy manufacturing method for a composite material that has both high strength and high conductivity, and is of high quality, and is suitable for use in electrode tip materials for spot welding, heat-resistant, high-strength, and high-conductivity wire materials, etc. shall be.

〈Ninth way to solve the problem〉 In order to achieve the purpose of diagonal improvement, the following measures will be taken.

That is, a coated copper powder with alumina attached to the surface of the copper powder is put into a thick copper cylinder and press-filled to create an extrusion billet, and after heating the billet, it is made into a dispersion-strengthened copper alloy. An extruded material integrally joined with the copper material of the outer skin is obtained, and the extruded material is subjected to cold working to obtain the desired heat-resistant, high-strength, highly conductive composite material.

<Function> Since the method of the present invention uses nine-coated copper powder by adhering alumina to the surface of copper powder, high-quality raw materials can be easily obtained, and the dispersion that forms the core of the desired composite material can be easily obtained. The quality of the reinforced copper alloy can be ensured from the raw material perspective, and since the coated copper powder is directly put into the cylinder and pressed with a press, etc., it is easy to control the filling rate of the coated copper powder and control pollution prevention. This makes it easy to manufacture high-quality composite materials from a work perspective.

In addition, since copper is used as the cylinder, it has excellent properties required as a raw material for the outer skin surrounding the core of the composite material, that is, both electrical conductivity and thermal conductivity, and is also excellent in economical efficiency. The copper cylinder is filled with coated copper powder to form an extruded billet, and the billet is heated to a high temperature without degassing and subjected to high-temperature isostatic extrusion.
No trap μ occurs during operation, and it is possible to extrude at a high extrusion ratio by keeping the area ratio between the coated copper powder filled part of the billet and the circumferential side of the cylinder at a constant ratio, economical efficiency, and quality. Extruded materials with excellent surface properties can be obtained. Next, the extruded material extruded by high-temperature isostatic extrusion is cold-worked to adjust its dimensions and shape, and is then work-hardened, making it possible to form the dimensions and shape and harden them in the same process. This makes it possible to omit the hardening heat treatment step that is essential when a precipitation hardening type copper alloy is used for the cylinder, which is very advantageous in terms of cost.

<Example> Next, an example of the present invention will be described in detail with reference to an example of manufacturing an electrode chip material, and the manufacturing conditions of a #thermal high-strength high-conductivity wire will also be mentioned.

FIG. 1 shows a manufacturing process diagram of an electrode chip when all of the present invention is applied. Based on the process diagram, Book 5j! Summary of the example I! Let me explain first.

First, an extruded billet is created in which a copper cylinder is filled with alumina-coated copper powder, but M? The Il-coated copper powder is obtained by subjecting high-purity electrolytic copper powder to a complex treatment and adhering alumina to its surface, and is prepared in advance. As shown in Figure 2, the coated copper powder is made of copper that is separately processed and cleaned from a steel material! ! ! ! ! It is filled into the cylinder (2), and then the head (4) having an opening (5) communicating with the open end of the vaginal cylinder (2) is fully joined to obtain an extruded billet [1].

After the billet (1) is heated to a high temperature, the head (1) is placed in a container (6) of an isostatic extruder, as shown in FIG.
4) 'f, inserted with the die (7) side facing, and subjected to surface reduction processing by high-temperature isostatic extrusion, as shown in Figure 4, an extruded material with a dispersion-strengthened copper alloy core α11 surrounded by an outer skin αq. (9
] is obtained. The extruded material (9) is subjected to the necessary cold working to form a composite material, and further subjected to peg forming to obtain the electrode tip a2 shown in FIG.

Each step will be explained in detail below.

In Fig. 2, the coated copper powder (3) filled in the filling part (2b) which is the internal space of the copper cylinder (2) is
It can be obtained by the complex treatment disclosed in Japanese Patent No.-56660. The copper powder used is preferably one of high purity and high electrical conductivity, and specifically, electrolytic steel powder can be mentioned.

The dispersion-strengthened copper alloy manufactured by such a coated copper powder has pure copper with high electrical conductivity as a matrix, and alumina is uniformly dispersed in the matrix as a dispersion-strengthening material. It is suitable as a core member of the intended composite material.

By the way, as methods for producing dispersion-strengthened copper alloys, there are the aforementioned internal oxidation method and powder mixing method, but it is difficult to obtain high quality products with either method.
It is not preferable to use dispersion-strengthened copper alloy powder obtained by such a method.

As for the characteristics of the coated copper powder used in the present invention, it is preferable that the coated copper powder is finely axial powder with 100% of 200 mesh or less, 98% or more of 350 mesh or less, and an alumina content of 0.6 to 1.2511i. If it is less than 0.6 tJ5, the strength (hardness) of the extruded material will decrease, and it will be difficult to maintain 90 Hv or more'f. On the other hand, if it exceeds L2m'ft,
Alumina aggregates, making it difficult to uniformly disperse 7 μm alumina in the extruded material, making it impossible to expect an improvement in hardness, and lowering electrical conductivity. This means that extruded materials with various alumina contents (extrusion temperature 800°C) are created, and the extruded materials have 509
This was discovered as a result of investigating the hardness and electrical conductivity of the test material obtained by subjecting it to the cold working described in No. 6. It has been found that the hardness (2) and the electrical conductivity satisfy the following relationship when the alumina content is in the range of 0.5 to 1.2%.

H (Hv) = 100 ・X +50/' (5I
lIAc! S ) = -22,7-X + 100 However, X is the alumina content member (goods). Note that when the alumina content is L2flf, A is 75% M C8.

The alumina content is specified to be 0.6 to 1.2% for reasons of slanting, but 0.7 to 1.1% is desirable as it is stable in quality and can be used industrially.

The cylindrical body (2) filled with the coated copper powder is concentric with the core portion, which is a dispersion-strengthened copper alloy, in the final product electrode chip U shown in FIG. It is the encapsulated outer skin.

In the case of electrode tips, the material of the outer cover has low electrical conductivity and thermal conductivity because there is little resistance heat generation due to the large current flowing through the electrode tip during spot welding, and it is necessary to promote heat removal from the surface of the welded material. Copper is preferably used as an economical material, and among these, high-purity materials with extremely good properties are preferred. Further, in order to improve heat conduction, it is preferable to increase the area ratio of the outer skin of the electrode tip (2), and the thickness of the circumferential side portion (2a) of the cylinder body is determined in consideration of this point.

Also in the case of a composite wire, the outer sheath is coated with a copper material (preferably highly conductive pure copper). The advantages of coating copper material 1 are:
The following points can be mentioned.

First, the conductivity and strength of the conductive wire can be easily adjusted. Dispersion-strengthened copper alloys can be mass-produced to reduce costs, but it is not preferable to produce them in small quantities. On the other hand, since the extruded billet O unit weight is about 100, when manufacturing the copper cylinder, the dimensions are changed in units of 100, and the area ratio of the outer skin of the composite wire is adjusted.
It is relatively easy to adjust the conductivity and strength of the wire.

Second, the manufacturing process can be completely shortened.

When molding coated copper powder, it is essential to have a case in which all of the coated copper powder is compacted. The case 7 is generally removed after molding, but if copper material is used as the case material for copper powder molding, the case itself can be made a part of the product, and the economical effect of shortening the process can be achieved. arise.

Thirdly, quality deterioration can be prevented during processes such as drawing, annealing, and pickling. Since the outer sheath of the composite wire rod is made of molten copper, these steps can be performed in the same process as handling copper materials, and quality deterioration such as falling off of alumina, local oxidation, or local corrosion can be prevented.

Incidentally, the inner diameter A of the cylindrical body (2) during billet production can be easily calculated using the Queen's formula.

Here, work A: billet outer diameter H = area ratio of core of extruded material β: filling rate of coated copper powder The above-mentioned cylinder [2] is filled with the coated copper powder described above, but the coated copper powder is Because it is fine and flaky, the apparent density is 1.0.
In order to obtain an extruded material with a stable area ratio in the cross section as low as ~1.7 y/ad, it is necessary to set the filling rate of the coated copper powder to a value that can be stably managed.

There are preforming methods such as rubber pressing to increase the filling rate of coated copper powder, but when incorporating the preformed material into billets, it is difficult to prevent dirt or foreign materials from getting mixed in, so it is difficult to control dimensions when assembling f6. It is also difficult to obtain high quality billets. In the present invention, since the coated copper powder is directly charged into the cylinder C2) and the filling rate is controlled by a press, it is easy to control contamination prevention and also control the composite ratio of the billet after filling. It becomes possible to easily manufacture high-quality extruded materials.

The filling rate of the coated copper powder is preferably 65 to 8,596.

If the amount exceeds 905 etf, it will be difficult to discharge the gas remaining in the filled coated copper powder, and the quality of the extruded material may not be guaranteed. On the other hand, with 6096 or less, the volumetric contraction of the filling part (gb) is large during extrusion, the deformation of the circumferential side part (2a) of the cylinder body is not uniform, and the area ratio of the extruded material is locally different. It becomes impossible to obtain high quality extruded material. In addition, if the filling rate is small, it is disadvantageous in terms of p-manufacturing because the billet has a small unit weight.

The simplest way to manage the filling rate is to manage the load. On the other hand, the method of controlling the weight of the coated copper powder to be introduced and the press stroke can improve the accuracy of the filling rate, but the work and equipment are complicated. FIG. 6 shows the relationship between press pressure (t, hd) and filling rate (■) in the case of load management. As shown in this figure, for example, to manage the preferred filling rate on the slope, 4.5 tea at a filling rate of 85% is required.
It can be seen that it is sufficient to manage 2-/- with lad, 65%.

Nine cylinders (2) are filled with coated copper powder (3) at a predetermined filling rate.
As shown in FIG. Open. mK! Close, 6 Close, etc.
[It is joined together to form an extruded billet (1).

The billet (1) is heated without degassing and sealing the openings (5). In this way, if the billet (1) is heated completely open to the outside air, the billet will not bulge and deform, which would occur due to unreliable degassing when heated in a closed state, so it will not be possible to insert the billet into the extruder container. tiger 1
/I/l- can be completely eliminated. Furthermore, even if a billet that is not degassed and sealed is used, there will be no quality problems in the extruded material. The reason for this is that the gas remaining inside the billet expands to high pressure (by heating the billet to 600 to 1000°C), flows out through the hole (5) formed in the billet head, and further, This is because the pressure becomes high due to compressive deformation of the circumferential side portion ('2B) of the cylinder at the initial stage of extrusion pressurization, and is discharged to the outside through the opening (5).

The billet heating temperature is an important requirement for billet manufacturing conditions, since it affects the electrical conductivity of the extruded material and the hardness after annealing. Table 1 shows the results of investigating the relationship between billet heating temperature, room temperature hardness (Hv), and room temperature electrical conductivity (%IAO8) after annealing the extruded material at each temperature. however,
The measurement site was the core of the extruded material (dispersion-strengthened copper alloy). Note that the billet heating temperature can be determined by considering this annealing temperature as the refining temperature or the temperature during use.

Table 1 From Table 1, when the billet wetness is 500°C or less and the annealing temperature is 800°C or more, the hardness decreases significantly. On the other hand, at 600 to 1000°C, there is no significant decrease in hardness or electrical conductivity even if the annealing temperature is increased to 800°C.

Therefore, the billet heating temperature is selected in the range of 600 to 1000° C. depending on the application and usage conditions of the chip.

Dispersion-strengthened copper alloys are expensive as they are different materials, so they must be manufactured by reducing the number of extrusion steps from a billet with a large unit weight, that is, extruded at a high extrusion ratio. Heating it to a high temperature is necessary as a prerequisite.

The heated billet (1) as shown in FIG.
It is inserted sideways into the container (6) of the hydrostatic extruder, and as shown in FIG. 4, the area is reduced by high temperature isostatic extrusion.

One of the reasons why the billet head (4) is placed on the Radyne (7) side is that the peripheral side (2a) of the cylinder is deformed during pressurization at the initial stage of extrusion, and the copper powder in the filling and coating of the cylinder (2) is The residual gas is compressed, but this is to ensure an escape route for the high-pressure gas and to prevent the pressure medium (8) from hydrostatic extrusion from entering.

In addition, applying high-temperature isostatic extrusion to the area reduction process is to maintain a constant area ratio between the filling part (2b) filled with the coated copper powder (3) and the cylinder circumferential side part (2a) in the cross section of the billet. This is because deer can also be extruded at a high extrusion ratio while preserving the ratio. This has important implications in terms of reducing manufacturing costs and improving the quality of extruded materials.

In high-temperature isostatic extrusion, the extrusion ratio is preferably 20 or more. The extrusion ratio affects the manufacturing cost and the quality of the extruded material, but if the extrusion ratio is less than 20, it will be disadvantageous in terms of texture, and no improvement in quality can be expected even if the cold working described later is repeated.

In addition, when extruded material is used as a raw material for composite wire, the drawing area reduction rate after that is very large, so the extrusion ratio is generally set as high as 80 to 100, although it depends on the wire diameter. .

By the way, in JP-A-52-65115, an extruded material obtained by isostatically extruding a billet in which a dispersion-strengthened copper alloy is arranged in a silk copper case with a billet outer diameter of 50 and a wall thickness of 1 is described. It has been disclosed that there is no breakage, and it has been suggested that the isostatic extrusion method is suitable for extruding composite materials.
3000b/ff1f fi K v っ) fi 7
It was determined that extrusion was carried out without Jl*', and the stability of the area ratio between the core of the extruded material and the outer skin of the extruded material was not disclosed.

The extruded material obtained by isostatic extrusion is further subjected to cold working to produce the desired composite material.One of the purposes of cold working is to make the hot isostatically extruded material with low hardness. One is to work harden the material, and the other is to adjust the size and shape.

The hardness of the dispersion-strengthened copper alloy of the core part (■) of the extruded material (9) obtained by hot isostatic extrusion K is not more than 100 Hy, and when an area reduction rate of 10% or more is added by Dyne drawing, the hardness becomes 115-150H1'. Then, the area reduction rate is 8
Even when applied up to 0%, there is no significant change in quality characteristics.

However, if it exceeds 85%, the hardness after high temperature heating decreases as shown in FIG. Therefore, when it is desired to prevent a decrease in hardness even after high-temperature heating, the cold working rate is preferably 10 to 80% in terms of die drawing area reduction rate.

When the composite material is used as a material for an electrode chip, cold working may include press molding or drawing. In press forming, the extruded material is cut into single lengths, then molded and work hardened by plastic processing, and refined to obtain the electrode tip a force.On the other hand, in drawing forming, the extruded material is This is a method in which the electrode tip is formed into the outer diameter of the Dainu drawing electrode tip (2), work-hardened, then cut into single lengths, and then subjected to cutting or press molding and refinement. On the other hand, when using composite materials as composite wires,
In many cases, there are no requirements for hardness, which is different from the use of electrode tips (,
It is drawn by adding cold working of 8096 or more.

In addition, in the case of the method for manufacturing a composite wire, the area ratio of the core (dispersion-strengthened copper alloy) in the composite wire is preferably 60 to 95%. If it exceeds 95%, the thickness of the copper on the outer skin is 1 of the outer diameter.
．． 596, and if this corresponds to a billet with an outer diameter of 143 mm, the wall thickness of the cylinder (2) will be less than 1□5 mm, which poses a problem for industrial handling. In addition, if the alumina content of the dispersion strengthened copper alloy is high, the conductivity will be poor, and to improve this, the outer skin must be made thicker, but the maximum value of the alumina content is L2511i, and in this case, the dispersion The electrical conductivity of the reinforced copper alloy is approximately 73% M C8 (hardness 1
50ay, which is good), so in order to ensure a conductivity of t"901J5 or more, the area ratio of pure copper in the outer skin needs to be 40% or more.

By the way, when a precipitation-strengthened copper alloy is used for the outer skin of an electrode chip, heat treatment as a precipitation process is essential.
In this case, the process of adjusting the dimensions and the heat treatment process must be separate processes, but in the case of the present invention, the molding of the dimensions and shape and the curing process can be performed in the same process, simplifying the manufacturing process. It is advantageous in terms of cost.

Next, more specific examples will be described.

1. Electrode chip manufacturing example (1) Manufacturing method ■ A pure copper cylinder with an outer diameter of 146fi and an inner diameter of 85.7si is filled with alumina-coated copper powder (average particle size of 5 μm, alumina content of 0.79%). Filled at a rate of 75%, as shown in Figure 2.
An extruded billet was created.

■ Heat the billet to 800°C and extrude it at an extrusion ratio of 50 as shown in Figure 4 to obtain an outer diameter of 2ON and a core diameter of 11.5tx.
An extruded material was obtained. It was confirmed that the area ratio between the core and the outer skin of the extruded material was stable in the extrusion direction.

■ After drawing the extruded material with a die to tt16ym (cold area reduction rate 3695), cutting it into the electrode tip shown in Fig. 5 (DT=*15, DM=Da9, nN=05, L
=23m)e obtained.

(21 Life Comparison■ The electrode tip of the present invention (example) described above and the same-shaped O
Electrode tip made of u-Or material (Comparative Example 1) and Ou-AI obtained by internal oxidation method! , 0. A full lifespan comparison was made with a t-pole tip (Comparative Example 2) using dispersion-strengthened copper alloy powder.

■ Test method Galvanized steel plate (8EO00, 8t, zinc-coated fi
40/40 f/lr/), a 7-pot welding test was conducted under the following conditions, and the life was defined as the time when the 5-core nugget limit current (t: welded plate thickness) reached 12.5 KA.

Recording current 12600 A
'Electrification time 12 cycles Pressure force 200 Kg Dot speed 1 time/sec ■Results Figure 8 shows the test results, 5F nugget limit current (
11) and the relationship between the number of consecutive RBIs. In the figure, ◯ indicates an example of the present invention, △ indicates Comparative Example 1, and . indicates Comparative Example 2.

The number of dots (lifetime) of each electrode tip at the time when the sJ nugget limit current value=12.5KA in FIG. 8 is as shown in the table below.

Examples 5,000 times Comparative Example I H2O times Comparative Example 2 2,800 times (3) Some considerations regarding the core diameter Initial tip diameter of the electrode tip The tip diameter when the life is reached after continuous dotting with Sero cod is It 9 tm, the core diameter DM is preferably y4 to X 9 m+. Even if the diameter is larger than y9, there is no increase in the life of the dot, which is economically disadvantageous. On the other hand, in the case of [Y4 work] small diameter, the strength of the copper material on the outer periphery is low, so it cannot bear the surface pressure caused by the subsequent pressurizing force generated at the tip of the electrode tip, and excessive load acts on the dispersion-strengthened alloy in the core. However, the deformation of the tip will significantly shorten the life.

2. Manufacturing Example of Composite Wire Rod (1) Manufacturing Method■ Alumina-coated copper powder (alumina content, Example: 0.79 F, Example B: 0.87%) at a filling rate of 75% (common to Examples M and B) to prepare an extruded billet.

■ The corresponding bit Vtsu)? Heated to 800℃, extrusion ratio 91
An extruded material having an outer diameter of 15 mm was obtained.

(2) The extruded material was subjected to die drawing to reduce the area to 0.77 tm. In this case, the area ratio of the codispersion strengthened copper alloys of Examples A and B was 75.0%.

(ffi) Performance test■ Relationship between electrical conductivity and tensile strength and temperature Dispersion-strengthened copper alloys are p-work hardened by cold working and softened by annealing at an arbitrary temperature. The electrical conductivity has a constant value depending on the annealing temperature. FIGS. 9 and 10 are diagrams showing the relationship between the annealing temperature (annealing time: 30 minutes) and the tensile strength and conductivity at room temperature of the composite wire according to the wood-based example. Exemplary embodiment B of the present invention was annealed at 800° C. and had very good tensile strength of 30 cm or more and electrical conductivity of 95% or more. This has an important meaning in ensuring the subsequent performance of the lead wire, since when the composite wire is used as a lead wire for an electronic component such as a diode, there is a diffusion bonding process at about 700°C. It can also be seen that the desired properties can be imparted to the composite material by adjusting the annealing temperature (see Figure 9.10).

FIG. 11 is a diagram showing the relationship between tensile strength and electrical conductivity at room temperature based on FIGS. 9 and 10. In the same figure, for comparison, Cu (oxygen-free copper), C! u-Ag alloy (mug
: 0.027%), (3u-Zn alloy (Zn:
0.1~0.296), Cu-Cd alloy (Cd
: 0.7 to 1.2) data are also shown.

Although mxtt, Ou-Zr and Ou-Cd have good strength, they have low electrical conductivity. Although Cu and Ou-~ have higher strength and electrical conductivity than this rush example, from the relationship between annealing temperature and hardness shown in Fig. 12, highly conductive Cu, Cu
It can be seen that -Ag has a low softening temperature, and rapid strength deterioration occurs at 200°C for Cu and 350°C for Ou. The special embodiments of the present invention have good strength and conductivity, and as already mentioned, they also have good high-temperature properties.

■ Bending test at 700°C Example B of the present invention and Cu of the same wire diameter (Tough pitch C!
u) The @ material and the gold were fixed in a cantilevered manner, a 15F 11L was attached to the tip, and the material was held at 700°C for 30 minutes. The results are shown in Fig. 13. The middle part of the figure shows the length from the fixed end to the tip before attaching the Ii plate.

In Example B, when subjected to temperature lining at 700°C, the conductivity was very good at about 96% IAO8, and the 13th
From the figure, it can be seen that the bending strength is greatly improved compared to Ou.

<Effects of the Invention> As described above, according to the method of the present invention, the dispersion-strengthened copper alloy material forming the core of the composite material can be made of high quality,
Furthermore, the manufacturing process of the composite material can be simplified without degrading quality. As described above, the method of the present invention is extremely excellent as a high-quality, simple, and easy manufacturing method for composite materials that are suitably used for spot welding electrode tips, heat-resistant, high-strength, and high-conductivity wires, and the like.

[Brief explanation of the drawing]

Fig. 1 is a process diagram showing an outline of the manufacturing process of an electrode chip according to the present invention, Fig. 2 is a sectional view showing an example of an extruded billet used in the present invention, and Fig. 5 is a process diagram showing an example of an extruded billet used in the present invention. Figure 4 is a sectional view showing the state inserted into the machine container.
Figure 5 is a cross-sectional view showing an example of the electrode chip, and Figure 6 is the relationship between press pressure and filling rate. FIG. 7 is a diagram showing the relationship between the drawing area reduction rate and hardness, FIG. 8 is a diagram showing a lifespan comparison between the electrode tip according to the present invention and an electrode tip made by another method, and FIG. 10 is a diagram showing the relationship between the annealing temperature and the tensile strength at room temperature of the composite wire according to the present invention, FIG. 10 is a diagram showing the relationship between the annealing temperature of the composite wire and the electrical conductivity at room temperature, and FIG. FIG. 12 is a diagram showing the relationship between electrical conductivity and tensile strength, FIG. 12 is a diagram showing the relationship between annealing temperature and hardness, and FIG. 15 is a diagram showing the results of a high-temperature bending test of wire rods. (1)...Billet, C2)...Cylinder, (3)...
・Coated copper powder, (4)...Head, (5)...Open hole, (
7)...Dice, (9)...Extruded material, σQ...
Outer skin, ■... core, ■... electrode tip. Shi97 70th self figure 77 conductivity J4 (zIAc phantom figure 72 o 2υ 1m tep , /w 1
m 7 m λ 4 H Shiba t) Fig. 13

Claims (1)

[Claims] 1. Coated copper powder with alumina adhered to the surface of the copper powder is introduced into a thick copper cylinder and press-filled to create an extrusion billet, and after heating the billet, The area is reduced by high-temperature isostatic extrusion to obtain an extruded material in which the core dispersion-strengthened copper alloy and the outer copper material are integrally joined, and the extruded material is cold-worked to create a composite material. A method for producing a heat-resistant, high-strength, highly conductive composite material, characterized in that it is made into a material. 2. The alumina content of the coated copper powder is 0.6 to 1% by weight.
2%, the filling rate of the coated copper powder is 65 to 85%, the heating temperature of the extrusion billet is 600 to 1000°C, and the extrusion ratio is 20 or more. A method for manufacturing a heat-resistant, high-strength, highly conductive composite material. 3. The method for producing a heat-resistant, high-strength, highly conductive composite material according to claim 1, which comprises performing cold working with a drawing area reduction rate of 10 to 80%. 4. After putting the coated copper powder into a thick-walled copper cylindrical body and press-filling it, the billet head, which has an opening communicating with the opening of the cylindrical body, is joined to the open end of the cylindrical body and extruded into a billet. 2. The method for producing a heat-resistant, high-strength, highly conductive composite material according to claim 1, wherein the extruded billet is subjected to high-temperature isostatic extrusion with the open end of the billet facing the die side. 5. The method for producing a heat-resistant, high-strength, highly conductive composite material according to claim 1, wherein the composite material is a material for spot welding electrode tips. 6. The method for producing a heat-resistant, high-strength, highly conductive composite material according to claim 1, wherein the composite material is a heat-resistant, high-strength, and highly conductive wire material.