CN110144489B - A kind of high strength, high electrical conductivity and high thermal conductivity copper-silver alloy wire and preparation method thereof - Google Patents

Abstract

The invention relates to a copper-silver alloy wire with high strength, high electrical conductivity and high thermal conductivity and a preparation method thereof, belonging to the technical field of metal material preparation. The method for preparing a copper-silver alloy wire with high strength, high electrical conductivity and high thermal conductivity of the present invention comprises the following steps: (1) batching and smelting; (2) hot-type horizontal continuous casting: the melt adopts hot-type horizontal continuous casting to obtain billet; the mold of the hot mold horizontal continuous casting is a hot mold mold, and the temperature of the melt in the hot mold mold is kept above the melting point of the copper-silver alloy wire; the cooling method of the hot mold horizontal continuous casting is: Twice cooling and water cooling; (3) Combined deformation heat treatment: the billet is sequentially subjected to solution treatment, drawing plastic deformation treatment and aging heat treatment, that is, it is obtained. The method is beneficial to the improvement of the as-cast microstructure, improves the electrical conductivity, thermal conductivity and tensile strength of the copper-silver alloy, and can realize continuous production.

Description

A kind of high strength, high electrical conductivity and high thermal conductivity copper-silver alloy wire and preparation method thereof

technical field

The invention belongs to the technical field of metal material preparation, and particularly relates to a high-strength, high-conductivity and high-thermal-conductivity copper-silver alloy wire and a preparation method thereof.

Background technique

Copper-silver alloys are often used as key materials for signal transmission in electronic communication equipment. With the development of copper alloy profiles in the direction of high transmission rate, high fidelity, and high definition and uniformity, etc. put forward higher requirements. The traditional copper-silver alloy bar preparation methods are: smelting, semi-continuous casting, extrusion or forging, multi-pass drawing, heat treatment, etc. It has the following limitations: due to the traditional copper-silver alloy bar preparation process, it is necessary to first smelt and cast the ingot, then perform machining on the ingot, such as peeling and removing the riser, and then perform secondary thermoplastic deformation. The microstructure and properties of the bar are improved by drawing and heat treatment in one pass. The whole preparation process has many processes and long cycle, and it is difficult to realize the continuous production of long bars; at the same time, the smelting and casting process is prone to defects such as shrinkage holes, central voids, and inclusions, and the performance cannot meet the requirements for use.

Continuous casting technology is a continuous production technology in which molten metal is introduced into a mold called a mold, and the molten metal is solidified in the mold and pulled out from the other end. In theory, as long as the molten metal is continuously replenished, it can be cast. Profiles of any length. At present, from the opposite direction of the mold and the smelting furnace, the main process is upward continuous casting; at the same time, the cooling and solidification of the melt is mainly achieved by passing cooling water around the mold. The preparation method involved in the Chinese invention patent applications with application publication numbers CN105414238A and CN106205870A adopts a cold mold, which is easy to be involved in inclusions during the casting process, and the metal melt is nucleated on the inner wall of the casting mold, and is perpendicular to the inner wall. Center growth. Although this method can eliminate the transverse grain boundary perpendicular to the stress axis, the temperature gradient is not high enough, and the heat dissipation direction is difficult to be unified in one-dimensional direction. Therefore, the crystal has sufficient time to grow up, and it is easy to form relatively large dendrites, and equiaxed crystals will also be formed at the end of solidification. This results in coarse grains, dendrite segregation, and relatively regular columnar crystals or single crystals cannot be obtained.

The current industrialized preparation technologies, such as smelting, semi-continuous casting, extrusion or forging, multi-pass drawing, heat treatment, etc., have many processes and long cycles, making it difficult to achieve continuous production of longer bars; at the same time, the smelting and casting process is prone to Defects such as shrinkage holes, central voids, inclusions, etc., can not meet the performance requirements.

The Chinese invention patent application with the application publication number CN104818443A discloses a short-flow and high-efficiency production method of copper-silver alloy wire. For copper-silver alloy wire billets with a diameter of 1-30 mm, the drawing speed of warm mold continuous casting is 1-600 mm/min; for copper-silver alloy wire billets with a diameter of 15-30 mm, the recrystallization temperature is 20-50 mm at room temperature or lower than the wire billet recrystallization temperature. Rolling is carried out at a temperature of ℃, and the rolling passes are 1 to 12 to obtain copper-silver alloy wires with a diameter of 8 to 15 mm. Wire rods with a diameter of 10 to 50 μm are drawn; for wire blanks with a diameter of 1 to 15 mm, the drawing method is directly used, after 7 to 12 passes of rough drawing at room temperature, and then finely drawn to a wire rod with a diameter of 10 to 50 μm .

The Chinese invention patent with the authorization announcement number CN106591753B discloses a short-process preparation and processing technology for a copper-chromium-zirconium alloy high-speed iron contact wire. Technical preparation of a copper-chromium-zirconium alloy with a diameter of 20-100mm and a strong axially oriented columnar crystal structure; (2) continuous solution treatment: the copper-chromium-zirconium alloy billet prepared in step (1) is subjected to online induction heating and continuous solidification. Solution quenching treatment, the solution temperature is 850-1100°C, the solution time is 2-60min, and the circulating cooling water is used for spray quenching; (3) room temperature rolling/drawing deformation: for the prepared in step (2) The copper-chromium-zirconium alloy wire is subjected to room temperature rolling/drawing deformation, the total area shrinkage is 20-90%, and the pass area shrinkage is 5-40%; (4) Continuous aging treatment: cold deformation in step (3) The copper-chromium-zirconium alloy wire is subjected to continuous aging treatment by on-line induction heating, and the aging temperature is 400-550 ° C, and the aging time is 5-120 minutes; (5) drawing deformation: the copper-chromium-zirconium alloy wire prepared in step (4) is processed. Carry out drawing deformation, the total area reduction rate is 5-50%, and the pass area reduction rate is 5-20%; (6) continuous aging treatment: the copper-chromium-zirconium alloy wire prepared in step (5) is subjected to a second The continuous aging treatment is performed by on-line induction heating. The temperature of the aging treatment is 300-500 °C, and the aging treatment time is 5-60 minutes.

The copper-silver series alloys in the prior art adopt warm mold continuous casting, cold mold continuous casting, and hot-cold combined continuous casting, and no copper-silver series alloys are prepared by hot mold continuous casting. Different from other copper-based materials, silver itself has excellent electrical conductivity, and the conductivity decreases less after adding copper. At the same time, copper-based materials can also be added with other microalloying elements such as Cr, Zr, Nb, etc., due to high temperature and room temperature. Under these conditions, the solid solubility of microalloying elements in copper is quite different, which can play a significant effect of aging precipitation strengthening. In the process of casting and hot-cold combined continuous casting, it is difficult for the front of the liquid-solid interface to form a stable and almost parallel crystalline solidification trend along the horizontal continuous casting direction, so that it is impossible to achieve a directional solidification structure with few grain boundaries, even a single crystal structure. Microstructure plays an important role in improving the electrical and thermal conductivity of alloys. In addition, the copper-silver series alloys are continuously casted by a combination of hot and cold, followed by solution treatment, drawing treatment and aging treatment. The front of the liquid-solid interface is prone to form a V-shaped interface due to the existence of excessive undercooling, and the solidification structure cannot be achieved. Oriented growth leads to subsequent use of solid solution, drawing, and aging treatment, but the final performance will be due to the uneven structure and properties and disordered grain orientation caused by the inheritance of the congenital as-cast structure. The copper-silver alloys in the prior art do not perform the steps of solution treatment, drawing treatment and aging treatment in sequence after hot mold continuous casting.

SUMMARY OF THE INVENTION

The invention provides a method for preparing a copper-silver alloy wire with high strength, high electrical conductivity and high thermal conductivity.

The present invention also provides the high-strength, high-conductivity and high-thermal-conductivity copper-silver alloy wire prepared by the above preparation method. .

For achieving the above object, the technical scheme of the present invention is:

A preparation method of high strength, high electrical conductivity and high thermal conductivity copper-silver alloy wire, comprising the following steps:

(1) Batching and smelting: select raw materials according to the composition of copper-silver series alloy wires, heat and smelt the raw materials to obtain a melt, and the smelting temperature is 1100 ℃ ~ 1300 ℃;

(2) Hot-type horizontal continuous casting: the melt adopts hot-type horizontal continuous casting to obtain a billet; the mold of the hot-type horizontal continuous casting is a hot-type mold, and the temperature of the melt in the hot-type mold is maintained at the copper-silver Above the melting point of the alloy wire; the cooling method of the hot-type horizontal continuous casting is two cooling and water cooling;

(3) Combined deformation heat treatment: The billet is sequentially subjected to solution treatment, drawing plastic deformation treatment and aging heat treatment to obtain copper-silver alloy wires with high strength, high electrical conductivity and high thermal conductivity; the solution treatment is at 890-980 ℃ for 0.5-2.0h, and then water-cooled; the drawing plastic deformation treatment is 5-10 passes of cold drawing plastic deformation treatment, the deformation amount of a single pass is greater than 30%, and the total deformation amount is greater than 80%; The aging treatment is maintained at 400 to 600° C. for 0.5 to 12 hours, and then cooled. The cooling method is any one of furnace cooling, air cooling or air cooling.

First of all, the preparation method uses a thermal mold for heating and crystallization. The temperature of the melt in the thermal mold is kept above the melting point of the copper-silver alloy wire, so that the front of the liquid-solid interface forms a stable and consistent surface along the horizontal continuous casting direction. The tendency of crystallization and solidification avoids nucleation on the inner wall of the mold and forms one-way heat dissipation; the formed front of the stable liquid-solid interface is conducive to the preferential growth in the direction of directional solidification after nucleation, reducing grain boundary defects, and is conducive to the as-cast state along the horizontal continuous casting. Organizational improvement.

Secondly, through two water cooling processes, the cooling effect is further strengthened and the internal structure of the copper-silver alloy wire is stabilized.

Finally, add 5 to 10 passes of drawing cold deformation treatment with a large deformation amount between the solid solution and aging of the billet after horizontal continuous casting, so as to provide precipitation energy reserve for the subsequent aging heat treatment, improve the precipitation rate of the strengthening phase and The precipitation rate can produce various strengthening effects of aging precipitation strengthening, deformation strengthening, and fine grain strengthening, and improve the comprehensive properties of copper-silver alloys such as strength, electrical conductivity, thermal conductivity, etc., and can realize continuous production.

In order to improve the performance of the copper-silver alloy wire, preferably, the composition of the copper-silver alloy wire in step (1) is copper, silver, chromium, zirconium and niobium, and the quality of copper, silver, chromium, zirconium and niobium The ratio was (92.3-99.9):(0.1-4.0):(0-1.5):(0-1.2):(0-1.0).

In order to further improve the electrical conductivity and thermal conductivity of the copper-silver alloy wire, preferably, the composition of the copper-silver alloy wire in step (1) is copper and silver, and the mass ratio of copper and silver is (96.0～99.9) : (0.1 to 4.0).

In order to further improve the mechanical properties of the copper-silver series alloy wire under the premise of maintaining high electrical conductivity and thermal conductivity, preferably, the copper-silver series alloy wire in step (1) is composed of copper, silver and chromium, and copper. , the mass ratio of silver and chromium is (94.5-99.88): (0.1-4.0): (0.02-1.5).

In order to further improve the mechanical properties, stress relaxation resistance, and high temperature softening resistance of copper-silver alloy wires on the premise of maintaining high electrical conductivity and thermal conductivity, preferably, the copper-silver alloy wire described in step (1) is The composition of the silver-based alloy wire rod is copper, silver, chromium, zirconium and niobium, and the mass ratio of copper, silver, chromium, zirconium and niobium is (92.3-99.86): (0.1-4.0): (0.02-1.5): ( 0.01 to 1.2): (0.01 to 1.0).

In order to further improve the purity of the melt in the smelting process, reduce the content of impurity elements, and then provide a guarantee of composition and structure for the subsequent improvement of electrical and thermal conductivity and mechanical properties, improve the conductivity and mechanical properties of the material, and improve the microstructure of the material, preferably The raw material is metal element or alloy.

In order to further ensure that the front of a good liquid-solid interface achieves directional solidification and obtains good surface quality, and at the same time improves the continuous production efficiency, preferably, the water pressure of the water cooling in step (2) is 50-150KPa, and the level of heat type in step (2) is The pull-out speed of continuous casting is 10 to 100 mm/min.

It provides the original diameter guarantee for the cold deformation drawing with multiple passes and large deformation in the subsequent combined deformation heat treatment process, and at the same time, it will not cause the breaking phenomenon in the continuous casting process due to the too small diameter. Preferably, the diameter of the billet in step (2) 5 to 25mm.

In order to give full play to the comprehensive synergistic strengthening effect of aging precipitation strengthening and deformation strengthening, preferably, the solution treatment in step (3) is maintained at 900-960 ° C for 0.5-1.5h, and then water-cooled; The drawing plastic deformation treatment is 5 to 10 passes of cold drawing plastic deformation treatment, the single pass deformation is greater than 30%, and the total deformation is greater than 85%; the aging treatment in step (3) is 400～ Keep at 600℃ for 0.5-8h, and then cool down. The cooling method is any one of furnace cooling, air cooling or air cooling.

A copper-silver alloy wire with high strength, high electrical conductivity and high thermal conductivity obtained by the above preparation method.

The high-strength and high-conductivity copper-silver alloy wire is prepared by using the above-mentioned preparation method for the high-strength and high-conductivity copper-silver alloy wire. The high-strength and high-conductivity copper-silver alloy wire has better electrical conductivity, higher strength, regular crystal shape, and excellent comprehensive performance. ~37.9%.

Description of drawings

Fig. 1 is the schematic diagram of the horizontal continuous solidification device of the middle heat type crystallizer in Examples 1-3;

In Figure 1, 1-furnace body, 2-spacer, 3-melt, 4-graphite crucible, 5-press rod, 6-first thermocouple, 7-guide tube, 8-second thermocouple, 9 - Primary cooling device, 10- Traction device, 11- Rod blank, 12- Secondary cooling device, 13- Hot type crystallizer, 14- Heating rod.

Detailed ways

The present invention will be further described below in conjunction with specific embodiments.

The copper in the following examples is preferably electrolytic copper, more preferably No. 1 electrolytic copper, and the purity of No. 1 electrolytic copper is greater than or equal to 99.95%. The copper in the ingredients of the present invention can be other forms of copper, and is not limited to Electrolytic copper; the silver in the following examples is preferably high-purity silver particles, and the purity of the high-purity silver particles is ≥99.99%. The silver in the ingredients of the present invention can be other forms of silver, not limited to the high-purity silver particles in the specific embodiments; in the following examples The chromium is preferably high-purity chromium particles, and the purity of the high-purity chromium particles is greater than or equal to 99.95%. The chromium in the ingredients of the present invention can be other forms of chromium, not limited to the high-purity chromium particles in the specific embodiments; The zirconium is preferably zirconium particles, and the purity of the zirconium particles is ≥99.5%. The zirconium in the ingredients of the present invention can be other forms of zirconium, and is not limited to the zirconium particles in the specific embodiments; The purity of the particles is greater than or equal to 99.95%, and the niobium in the formulation of the present invention can be other forms of niobium, and is not limited to the niobium particles in the specific embodiment. Copper-silver alloy wires refer to alloy wires that are all copper-silver, or alloy wires that are copper-silver and other microalloying elements. The hot mold continuous casting in which the pulling method is horizontal pull out is the hot mold horizontal continuous casting. A hot mold is a mold containing heating rods or a casting mold containing heating rods.

The thermal crystallizer horizontal continuous solidification device used in the preparation of high-strength, high-conductivity, and high-thermal-conductivity copper-silver alloy wires in the following examples includes a smelting device and a solidification and crystallization device connected to the smelting device. The smelting device includes a smelting furnace. The smelting furnace includes a furnace body 1, a spacer block 2 is arranged at the bottom of the inner cavity of the furnace body 1, a graphite crucible 4 is arranged on the spacer block 2, and a graphite crucible 4 is arranged in the inner cavity for extruding the melt 3 to flow to the crystallization device. the pressure rod 5. The upper end of the crucible wall of the graphite crucible 4 is provided with a first melt outlet, and the upper end of the furnace wall of the furnace body is provided with a second melt outlet at a position corresponding to the first melt outlet. The smelting device further includes a guide tube 7, one end of the guide tube 7 passes through the first melt outlet and extends into the graphite crucible 4, and the other end passes through the second melt outlet and extends out of the furnace. The end face of the upper end of the furnace wall of the graphite crucible 4 is provided with a measuring hole extending in the furnace wall along the vertical direction, and a first thermocouple 6 is inserted in the measuring hole. The lower end of the first thermocouple 6 protrudes into the guide tube 7 through the measuring hole.

A solidification and crystallization device is connected to one end of the guide tube 7 extending out of the furnace body. The core of the solidification and crystallization device is the thermal crystallizer 13 . The thermal crystallizer 13 includes a crystallizer wall, and the crystallizer wall encloses a crystallizing channel for the melt to pass through. The melt passes through channels of different diameters, and finally solidifies a rod blank 11 with a corresponding diameter. A heating rod 14 is embedded in the wall 13 of the thermal mold. The heating rod 14 is a silicon carbide rod. The thermal crystallizer 13 also includes a second thermocouple 8 arranged at the outlet of the thermal crystallizer 13. The second thermocouple 8 is used to measure the temperature of the thermal crystallizer, and the measurement section of the second thermocouple 8 penetrates deep into the thermal crystallizer. The inside of the vessel 13 is close to the outlet, but does not protrude into the melt.

The melt in the graphite crucible enters into the hot mold 13 through the guide tube, and at the outlet of the hot mold 13, the melt condenses, and a solid rod blank 11 is gradually formed. A primary cooling device 9 is provided outside the outlet of the hot mold 13 in the circumferential direction of the rod blank 11 to spray water to cool the rod blank 11 . Downstream of the running direction of the rod blank 11 , secondary cooling devices 12 are further provided on the upper and lower sides of the rod blank 11 to perform secondary water spray cooling for the rod blank 11 . Downstream of the running direction of the rod blank 11 , a pulling device 10 is also provided to pull the rod blank 11 . The traction device 10 is a traction machine.

Embodiment 1 of the preparation method of high strength, high electrical conductivity and high thermal conductivity copper-silver alloy wire

The preparation method of the high-strength, high-conductivity and high-thermal-conductivity copper-silver alloy wire of the present embodiment includes the following steps:

(1) Batching and smelting: Select No. 1 electrolytic copper and high-purity silver particles as raw materials, and carry out batching according to the mass ratio of copper to silver in the copper-silver alloy wire rod as 96:4; the purity of No. 1 electrolytic copper is 99.95%, and the high-purity silver The purity of the particles is 99.99%; the prepared raw materials are put into a high-purity graphite crucible for heating and smelting, and the smelting temperature is controlled at 1100 ° C; the smelting process is carried out in a thermal mold horizontal continuous solidification device;

(2) Hot-type horizontal continuous casting: The hot-type horizontal continuous casting is carried out in the hot-type mold horizontal continuous solidification device, and the melt is heated and crystallized by the hot-type mold, and the temperature of the melt in the hot-type mold is kept at the copper-silver temperature. The melting point of the alloy wire is above 1084.5°C, then water-cooled with a water pressure of 150KPa, pulled out at a speed of 100mm/min, and cooled for a second time to obtain a copper-silver alloy continuous casting billet with a diameter of 5mm;

(3) Combined deformation heat treatment: The copper-silver series alloy continuous casting billet with a diameter of 5mm is sequentially subjected to solution treatment, drawing plastic deformation treatment and aging heat treatment to obtain high-strength, high electrical conductivity and high thermal conductivity copper-silver series alloy wire; The solution treatment was kept at 890°C for 2.0h, and then water-cooled; the drawing plastic deformation treatment was 5 passes of cold drawing plastic deformation treatment, the single pass deformation was 40%, and the total deformation was 99.84%; aging The treatment was kept at 400°C for 0.5h and then cooled with the furnace.

Embodiment 2 of the preparation method of high strength, high electrical conductivity and high thermal conductivity copper-silver alloy wire

The preparation method of the high-strength, high-conductivity and high-thermal-conductivity copper-silver alloy wire of the present embodiment includes the following steps:

(1) Batching and smelting: Select No. 1 electrolytic copper, high-purity silver particles and high-purity chromium particles as raw materials, and carry out batching according to the mass ratio of copper, silver and chromium in copper-silver alloy wires of 96.5:2.0:1.5; of which No. 1 The purity of electrolytic copper is 99.95%, the purity of high-purity silver particles is 99.99%, and the purity of high-purity chromium particles is 99.95%; the prepared raw materials are put into a high-purity graphite crucible for heating and melting, and the melting temperature is controlled at 1200 ° C; melting The process is carried out in a horizontal continuous solidification device of a thermal mold;

(2) Hot-type horizontal continuous casting: The hot-type horizontal continuous casting is carried out in the hot-type mold horizontal continuous solidification device, and the melt is heated and crystallized by the hot-type mold, and the temperature of the melt in the hot-type mold is kept at the copper-silver temperature. The melting point of the alloy wire is above 1084.5°C, and then water-cooled, the water pressure of the water-cooling is 100KPa, pulled out at a speed of 50mm/min, and cooled twice to obtain a copper-silver alloy continuous casting billet with a diameter of 12mm;

(3) Combined deformation heat treatment: The copper-silver series alloy continuous casting billet with a diameter of 12mm is sequentially subjected to solution treatment, drawing plastic deformation treatment and aging heat treatment to obtain high-strength, high electrical conductivity and high thermal conductivity copper-silver series alloy wire; The solution treatment is kept at 980 ° C for 0.5h, and then water-cooled; the drawing plastic deformation treatment is 7 passes of cold drawing plastic deformation treatment, the single pass deformation is 37%, and the total deformation is 97.14%; aging; The treatment was kept at 500°C for 2h and then cooled with the furnace.

Embodiment 3 of the preparation method of high strength, high electrical conductivity and high thermal conductivity copper-silver alloy wire

The preparation method of the high-strength, high-conductivity and high-thermal-conductivity copper-silver alloy wire of the present embodiment includes the following steps:

(1) Batching and smelting: No. 1 electrolytic copper, high-purity silver particles, high-purity chromium particles, zirconium particles and niobium particles are selected as raw materials, and the mass ratio of copper to silver in copper-silver alloy wire rod is 99.86:0.1:0.02:0.01 : 0.01 for batching; the purity of No. 1 electrolytic copper is 99.95%, the purity of high-purity silver particles is 99.99%, the purity of high-purity chromium particles is 99.95%, the purity of zirconium particles is 99.5%, and the purity of niobium particles is 99.95%; Put the prepared raw materials into a high-purity graphite crucible for heating and smelting, and the smelting temperature is controlled at 1300 ° C; the smelting process is carried out in a horizontal continuous solidification device of a thermal mold;

(2) Hot-type horizontal continuous casting: The hot-type horizontal continuous casting is carried out in the hot-type mold horizontal continuous solidification device, and the melt is heated and crystallized by the hot-type mold, and the temperature of the melt in the hot-type mold is kept at the copper-silver temperature. The melting point of the alloy wire is above 1084.5°C, then water-cooled with a water pressure of 50KPa, pulled out at a speed of 10mm/min, and cooled twice to obtain a copper-silver alloy continuous casting billet with a diameter of 25mm;

(3) Combined deformation heat treatment: The copper-silver series alloy continuous casting billet with a diameter of 25mm is successively subjected to solution treatment, drawing plastic deformation treatment and aging heat treatment to obtain high-strength, high electrical conductivity and high thermal conductivity copper-silver series alloy wire; The solution treatment is kept at 900℃ for 1.0h, and then water-cooled; the drawing plastic deformation treatment is 10 passes of cold drawing plastic deformation treatment, the single pass deformation is 30%, and the total deformation is 85%; aging The treatment was kept at 600°C for 0.5h and then cooled with the furnace.

Example 1 of high strength, high electrical conductivity and high thermal conductivity copper-silver alloy wire

The high-strength, high-conductivity, and high-thermal-conductivity copper-silver alloy wire of this embodiment is prepared by the preparation method in Example 1 of the preparation method for the high-strength, high-conductivity, and high-thermal-conductivity copper-silver alloy wire.

Example 2 of high strength, high electrical conductivity and high thermal conductivity copper-silver alloy wire

The high-strength, high-conductivity, and high-thermal-conductivity copper-silver alloy wire of this embodiment is prepared by the preparation method in Example 2 of the preparation method for the high-strength, high-conductivity, and high-thermal-conductivity copper-silver alloy wire.

Example 3 of high strength, high electrical conductivity and high thermal conductivity copper-silver alloy wire

The high-strength, high-conductivity, and high-thermal-conductivity copper-silver alloy wire of this embodiment is prepared by the preparation method in Example 3 of the preparation method for the high-strength, high-conductivity, and high-thermal-conductivity copper-silver alloy wire.

Test example

The diameter, electrical conductivity, thermal conductivity, Testing of tensile strength and elongation. Diameter, electrical conductivity, thermal conductivity, tensile strength and elongation are all tested by common test methods in the field.

the result shows:

The high-strength, high-conductivity and high-thermal-conductivity copper-silver alloy wire prepared in Example 1 of the preparation method for the high-strength, high-conductivity, and high-thermal-conductivity copper-silver alloy wire of the present invention has a diameter of 0.01 mm and a conductivity of 97.9%. IACS, the thermal conductivity is 312.6W·(m·K) ^-1 , the tensile strength is 456MPa, and the elongation is 37.9%.

The high-strength, high-conductivity and high-thermal-conductivity copper-silver alloy wire prepared in Example 2 of the preparation method for the high-strength, high-conductivity, and high-thermal-conductivity copper-silver alloy wire of the present invention has a diameter of 0.5 mm and a conductivity of 92.1% IACS, the thermal conductivity is 289.2W·(m·K) ^-1 , the tensile strength is 503MPa, and the elongation is 24.5%.

The high-strength, high-conductivity and high-thermal-conductivity copper-silver alloy wire prepared in Example 3 of the high-strength, high-conductivity and high-thermal-conductivity copper-silver alloy wire of the present invention has a diameter of 1.5 mm and a conductivity of 96.7% IACS, the thermal conductivity is 305.7 W·(m·K) ^-1 , the tensile strength is 538 MPa, and the elongation is 28.5%.

Claims (9)

1. a preparation method of high strength, high electrical conductivity and high thermal conductivity copper-silver alloy wire, is characterized in that: comprise the following steps: (1) Batching and smelting: select raw materials according to the composition of copper-silver alloy wires, heat and smelt the raw materials to obtain a melt, and the melting temperature is 1100 ℃ ~ 1300 ℃; the composition of copper-silver alloy wires is copper, silver , chromium, zirconium and niobium, and the mass ratio of copper, silver, chromium, zirconium and niobium is (92.3~99.9): (0.1~4.0): (0~1.5): (0~1.2): (0~1.0) ; (2) Hot-type horizontal continuous casting: the melt adopts hot-type horizontal continuous casting to obtain billets; the mold of the hot-type horizontal continuous casting is a hot-type mold, and the temperature of the melt in the hot-type mold is kept at the copper-silver temperature. Above the melting point of the alloy wire; the cooling method of the hot-type horizontal continuous casting is two cooling and water cooling; (3) Combined deformation heat treatment: The billet is sequentially subjected to solution treatment, drawing plastic deformation treatment and aging treatment to obtain copper-silver alloy wires with high strength, high electrical conductivity and high thermal conductivity; the solution treatment is at 890~980 ℃ Keep at ℃ for 0.5~2.0h, and then water-cooled; the drawing plastic deformation treatment is 5~10 passes of cold drawing plastic deformation treatment, the deformation amount of a single pass is greater than 30%, and the total deformation amount is greater than 80%; The aging treatment is kept at 400~600℃ for 0.5~12h, and then cooled. The cooling method is any one of furnace cooling, air cooling or air cooling. 2 . The method for preparing a copper-silver alloy wire with high strength, high electrical conductivity and high thermal conductivity according to claim 1 , wherein the copper-silver alloy wire in step (1) is composed of copper and silver, and The mass ratio of copper and silver is (96.0~99.9):(0.1~4.0). 3. The preparation method of high strength, high electrical conductivity and high thermal conductivity copper-silver alloy wire according to claim 1, characterized in that: in step (1), the composition of the copper-silver alloy wire is copper, silver and chromium , and the mass ratio of copper, silver and chromium is (94.5~99.88):(0.1~4.0):(0.02~1.5). 4. The preparation method of high strength, high electrical conductivity and high thermal conductivity copper-silver alloy wire according to claim 1, characterized in that: the composition of the copper-silver alloy wire in step (1) is copper, silver, chromium , zirconium and niobium, and the mass ratio of copper, silver, chromium, zirconium and niobium is (92.3~99.86):(0.1~4.0):(0.02~1.5):(0.01~1.2):(0.01~1.0). 5. The method for preparing a copper-silver alloy wire with high strength, high electrical conductivity and high thermal conductivity according to any one of claims 1 to 4, wherein the raw material is a metal element or an alloy. 6. The preparation method of high strength, high electrical conductivity and high thermal conductivity copper-silver alloy wire according to any one of claims 1 to 4, characterized in that: the water pressure of water cooling in step (2) is 50-150kPa, The pull-out speed of the medium-heat horizontal continuous casting in step (2) is 10-100 mm/min. 7 . The method for preparing a copper-silver alloy wire with high strength, high electrical conductivity and high thermal conductivity according to claim 1 , wherein the diameter of the blank in step (2) is 5 to 25 mm. 8 . 8. The preparation method of high-strength, high-conductivity and high-thermal-conductivity copper-silver alloy wire according to any one of claims 1 to 4, wherein the solution treatment in step (3) is performed at 900 to 900 Keep at 960°C for 0.5~1.5h, and then water-cooled; the plastic deformation treatment of drawing in step (3) is 5~10 passes of cold drawing plastic deformation treatment, the deformation amount of a single pass is more than 30%, and the total deformation The amount is greater than 85%; the aging treatment described in step (3) is to maintain at 400-600 ° C for 0.5-8 hours, and then cool, and the cooling method is any one of furnace cooling, air cooling or air cooling. 9. A high-strength, high-conductivity and high-thermal-conductivity copper-silver alloy wire prepared by the method for preparing a high-strength, high-conductivity and high-thermal-conductivity copper-silver alloy wire according to any one of claims 1 to 8.

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