CN114453418A - Short-process preparation method of high-strength high-conductivity Cu-Ni-Co-Si-Li alloy high-precision band - Google Patents

Short-process preparation method of high-strength high-conductivity Cu-Ni-Co-Si-Li alloy high-precision band Download PDF

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CN114453418A
CN114453418A CN202210006749.1A CN202210006749A CN114453418A CN 114453418 A CN114453418 A CN 114453418A CN 202210006749 A CN202210006749 A CN 202210006749A CN 114453418 A CN114453418 A CN 114453418A
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CN114453418B (en
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朱戴博
伍娜
韩坦
陈锋
刘洪涛
王富涛
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Kinkou Suzhou Copper Industry Co ltd
Guangdong Zhongfa Modan Technology Co ltd
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Kinkou Suzhou Copper Industry Co ltd
Guangdong Zhongfa Modan Technology Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C22C1/03—Making non-ferrous alloys by melting using master alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C9/00—Alloys based on copper
    • C22C9/06—Alloys based on copper with nickel or cobalt as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C9/00—Alloys based on copper
    • C22C9/10—Alloys based on copper with silicon as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B2003/005—Copper or its alloys

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Abstract

The application discloses a short-process preparation method of a high-strength high-conductivity Cu-Ni-Co-Si-Li alloy high-precision strip, which comprises the following steps: carrying out vacuum melting on the raw materials to obtain mixed molten liquid, carrying out wire billet casting on the mixed molten liquid to obtain a casting blank, wherein the casting blank comprises the following components: nickel 1.0-2.0 wt.%, cobalt 0.5-1.0 wt.%, silicon 1-2 wt.%, magnesium 0-0.1 wt.%, lithium 0.03-0.1 wt.%, light rare earth 0.05-0.2 wt.%, and copper in balance. And continuously extruding the casting blank to obtain the copper bar. And (5) rolling the copper bar to obtain the plate. And (5) performing finish rolling on the plate to obtain a strip. And carrying out solid solution treatment on the strip to obtain a solid solution treated strip, and carrying out aging treatment on the solid solution product to obtain an aging treated strip. And (5) trimming and rolling the aging-treated strip to obtain the high-precision strip. The method adopts a deformation method of 'continuous extrusion and high-precision rolling', greatly shortens the preparation process, and obtains the high-strength high-conductivity Cu-Ni-Co-Si-Li high-precision strip with uniform second phase distribution and fine crystal grains.

Description

Short-process preparation method of high-strength high-conductivity Cu-Ni-Co-Si-Li alloy high-precision strip
Technical Field
The application relates to the field of metal materials, in particular to a short-process preparation method of a high-strength high-conductivity Cu-Ni-Co-Si-Li alloy high-precision strip.
Background
The Cu-Ni-Co-Si alloy has high strength, high elasticity, good conductivity and good stress relaxation resistance, is widely applied to the industrial fields of electronics, electricity, machinery and the like, and can be used as an integrated circuit lead frame, a high-current connector, a transistor current carrier, a high-elasticity contact and the like. In recent years, with the development of miniaturization, light weight, multiple functions and intellectualization of electronic information products, the demand for a high-strength and high-conductivity Cu-Ni-Co-Si copper alloy narrow band is increased dramatically. The conventional narrow Cu-Ni-Co-Si alloy band is mostly prepared by trimming and slitting wide strips, while the wide Cu-Ni-Co-Si alloy band is mostly prepared by a multi-pass rolling method, and the narrow band preparation method has the following problems: (1) large equipment investment and high preparation cost. The traditional Cu-Ni-Co-Si copper alloy wide strip has high requirements on a rolling mill due to large ingot casting size and deformation resistance, and has more rolling passes, so that the yield is low, the processing flow is long, and the preparation cost is high; (2) because the content of the alloy elements is high, the number of the alloy elements is large, the preparation of the large-size Cu-Ni-Co-Si ingot is difficult, the dendrite segregation inside the ingot is serious and can not be completely eliminated, the difficulty is brought to the subsequent rolling processing, and the strip is very easy to crack in the processing and forming process.
Disclosure of Invention
The application provides a short-flow preparation method of a high-strength high-conductivity Cu-Ni-Co-Si-Li alloy high-precision strip, which can solve the problems of large equipment investment, low yield, long processing flow and high preparation cost caused by high requirements on a rolling mill and multiple rolling passes of the traditional Cu-Ni-Co-Si copper alloy wide strip due to large casting blank size and deformation resistance; and because the content of the alloy elements is high, the number of the alloy elements is large, the preparation of the large-specification Cu-Ni-Co-Si casting blank is difficult, the dendrite segregation in the casting blank is serious and can not be completely eliminated, the difficulty is brought to the subsequent rolling processing, and the strip is very easy to crack in the processing and forming process.
The following technical scheme is adopted in the application:
the application provides a short-process preparation method of a high-strength high-conductivity Cu-Ni-Co-Si-Li alloy high-precision strip, which comprises the following steps: carrying out vacuum melting on the raw materials to obtain mixed molten liquid, carrying out wire billet casting on the mixed molten liquid to obtain a casting blank, wherein the casting blank comprises the following components: nickel Ni 1.0-2.0 wt.%, cobalt Co 0.5-1.0 wt.%, silicon Si1-2 wt.%, magnesium Mg 0-0.1 wt.%, lithium Li 0.03-0.1 wt.%, light rare earth RE 0.05-0.2 wt.%, and the balance copper Cu. And continuously extruding the casting blank to obtain the copper bar. And (5) rolling the copper bar to obtain the plate. And (5) performing finish rolling on the plate to obtain a strip. And carrying out solid solution treatment on the strip to obtain a solid solution treated strip, and carrying out aging treatment on the solid solution product to obtain an aging treated strip. And (5) trimming and rolling the aging-treated strip to obtain the high-precision strip.
Further, in the vacuum smelting process, the raw materials are placed into a vacuum smelting furnace, the vacuum degree is-0.1 MPa, argon is continuously introduced into the vacuum smelting furnace, the temperature of the molten liquid is controlled at 1120-1200 ℃ during smelting, and mechanical stirring is carried out after heat preservation is carried out for 30-60 min.
Further, in the process of casting the wire blank, the casting temperature is controlled to be 800-950 ℃, the casting speed is controlled to be 70-100mm/min, and the cooling water flow is 40-60m3/min, so that the casting blank with phi of 25-40mm is obtained.
Further, in the continuous extrusion process, the casting blank is heated to 800 ℃ of 700-. Obtaining the copper bar with the thickness of 5-8mm and the width of 60-100 mm.
Further, in the rolling process, the copper bar is subjected to solution treatment to obtain a soft copper bar, and then the soft copper bar is rolled on a four-roller rolling mill to obtain a plate with the thickness of 0.8-1mm and the width of 120-180 mm.
Further, carrying out solution treatment on the copper bar, comprising the following steps: carrying out solution treatment on the copper bar at the temperature of 860-1020 ℃ for 2-3 h.
Further, in the finish rolling process, the plate is subjected to solid solution treatment to obtain an annealed copper alloy plate, and then the copper alloy plate is subjected to finish rolling on a twenty-high rolling mill to obtain a strip with the thickness of 0.4-0.8mm and the width of 140-200 mm.
Further, the plate is subjected to solution treatment, comprising: the plate is subjected to solution treatment at the temperature of 700 ℃ and 920 ℃ for 1-2 h.
Further, in the solution treatment process, the strip is subjected to solution heat treatment at the temperature of 850-.
Further, in the aging treatment process, the aging treatment is carried out on the solution treated strip at 400-500 ℃ for 18-24 h.
The application also provides a high-strength high-conductivity Cu-Ni-Co-Si-Li alloy, wherein the weight percentage of nickel is 1.0-2.0 wt.%, the weight percentage of cobalt is 0.5-1.0 wt.%, the weight percentage of silicon is 1-2 wt.%, the weight percentage of magnesium is 0-0.1 wt.%, the weight percentage of lithium is 0.03-0.1 wt.%, the weight percentage of light rare earth is 0.05-0.2 wt.%, and the balance is copper.
Compared with the prior art, the method has the following beneficial effects:
(1) according to the method, the quality of the casting blank is further optimized and the performance of the casting blank is improved by adding the lithium Li element and the light rare earth RE element. The lithium Li is combined with oxygen and sulfur in the alloy to play a role in degassing and removing impurities, so that the conductivity of the alloy can be improved; secondly, the lithium Li is used as a lattice filling material, so that the overall density of the alloy can be improved, the plasticity of the alloy is improved, the high-temperature deformation resistance is reduced, and conventional continuous pressure processing can be carried out; in addition, the lithium Li also has the function of refining pure copper grains, so that the casting blank is nearly isotropic, and a tissue foundation is provided for subsequent large deformation. The light rare earth RE has the function of purifying a solution, so that the impurity content in a casting blank can be reduced, and the uniformity of the casting blank is improved; secondly, the addition of the light rare earth RE can refine precipitated phases in the alloy, and the strength and the conductivity of a final product are improved;
(2) according to the method, the traditional thought of preparing the high-precision strip by cutting the edge and dividing the strip of the wide strip is skipped, and the high-precision strip is directly prepared, so that the investment cost of equipment is reduced, the size of a casting blank can be effectively reduced, the heat treatment requirement of the casting blank is reduced, and the preparation cost is effectively reduced;
(3) in the application, under the combined action of alloying elements and a new preparation idea, a short-process large-deformation process of small-size Cu-Ni-Co-Si-Li casting with high deformation resistance becomes possible.
Drawings
FIG. 1 is a flow chart of the preparation of a Cu-Ni-Co-Si-Li alloy in the examples of the present application.
Detailed Description
The technical method in the embodiments of the present application will be clearly and completely described below. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The continuous extrusion is a processing method which has no extrusion residual, high material utilization rate, can realize the continuous production of products and extremely high production efficiency, and in order to prepare and obtain the short-flow Cu-Ni-Co-Si series copper alloy narrow band, referring to fig. 1, the embodiment of the application provides a short-flow preparation method of the high-strength high-conductivity Cu-Ni-Co-Si-Li alloy high-precision narrow band, which comprises the following steps:
step one, carrying out vacuum melting on raw materials to obtain mixed molten liquid, carrying out wire billet casting on the mixed molten liquid to obtain a casting blank, wherein the casting blank comprises the following components: nickel Ni 1.0-2.0 wt.%, cobalt Co 0.5-1.0 wt.%, silicon Si1-2 wt.%, magnesium Mg 0-0.1 wt.%, lithium Li 0.03-0.1 wt.%, light rare earth RE 0.05-0.2 wt.%, and copper Cu for the remainder.
In the steps, in the vacuum smelting process, the raw materials are placed into a vacuum smelting furnace, the vacuum degree is-0.1 MPa, argon is continuously introduced into the vacuum smelting furnace, the temperature of the molten liquid is controlled at 1120-1200 ℃ during smelting, and after heat preservation is carried out for 30-60min, mechanical stirring is carried out.
Wherein, the raw materials are put into a vacuum melting furnace, which can be: putting intermediate alloy of Cu-5Li, Cu-Ni and the like and high-purity copper into a vacuum smelting furnace according to a certain proportion.
The vacuum smelting furnace can be a vacuum intermediate frequency smelting furnace, and the argon can be high-purity argon.
In the process of casting the wire blank, the casting temperature is controlled to be 800-950 ℃, the casting speed is controlled to be 70-100mm/min, and the cooling water flow is 40-60m3/min, so that the casting blank with the diameter of phi 25-40mm is obtained.
The light rare earth RE may be a mixture of two or more light rare earth REs, or may be only one light rare earth RE.
And step two, continuously extruding the casting blank to obtain the copper bar.
In the above steps, in the continuous extrusion process, the casting blank is heated to 800 ℃ for 700-. Obtaining the copper bar with the thickness of 5-8mm and the width of 60-100 mm.
And thirdly, binding the copper bar to obtain the plate.
In the steps, the copper bar is subjected to solution treatment in the rolling process to obtain the soft copper bar, and then the soft copper bar is rolled on a four-roller rolling mill to obtain a plate with the thickness of 0.8-1mm and the width of 120-180 mm.
Wherein, the copper bar is subjected to solution treatment, which comprises the following steps: carrying out solution treatment on the copper bar at the temperature of 860-1020 ℃ for 2-3 h.
And step four, performing finish rolling on the plate to obtain the strip.
In the step, in the finish rolling process, the plate is subjected to solid solution treatment to obtain an annealed copper alloy plate, and then the copper alloy plate is subjected to finish rolling on a twenty-high rolling mill to obtain a strip with the thickness of 0.4-0.8mm and the width of 140-200 mm.
Wherein, the plate is subjected to solution treatment, which comprises the following steps: the plate is subjected to solution treatment at the temperature of 700 ℃ and 920 ℃ for 1-2 h.
And step five, carrying out solid solution treatment on the strip to obtain a solid solution treated strip, and carrying out aging treatment on the solid solution product to obtain an aging treated strip.
In the step, in the process of solution treatment, the strip is subjected to solution treatment at the temperature of 850-.
In the aging treatment process, the aging treatment is carried out on the solution treatment strip for 18-24h at the temperature of 400-500 ℃.
And step six, trimming and rolling the time-effect processing strip to obtain the high-precision strip.
In the above steps, the high-precision narrow band is specifically a Cu-Ni-Co-Si-Li high-precision narrow band.
Embodiments of the present application also provide a high strength, high conductivity Cu-Ni-Co-Si-Li alloy, nickel 1.0-2.0 wt.%, cobalt 0.5-1.0 wt.%, silicon 1-2 wt.%, magnesium Mg 0-0.1 wt.%, lithium 0.03-0.1 wt.%, light rare earth 0.05-0.2 wt.%, and the balance copper. The Cu-Ni-Co-Si-Li alloy was prepared by the short-run preparation method of the above example.
The method adopts a method of continuous extrusion and high-precision rolling, effectively reduces the high-temperature deformation resistance of the material through reasonable alloy component design (adding lithium Li and light rare earth), and realizes conventional continuous extrusion, and has the following advantages:
(1) by adding lithium Li element and light rare earth RE element, the quality of the casting blank is further optimized, and the performance of the casting blank is improved. The lithium Li is combined with oxygen and sulfur in the alloy to play a role in degassing and removing impurities, so that the conductivity of the alloy can be improved; secondly, the lithium Li is used as a lattice filling material, so that the overall density of the alloy can be improved, the plasticity of the alloy is improved, the high-temperature deformation resistance is reduced, and conventional continuous pressure processing can be carried out; in addition, the lithium Li also has the function of refining pure copper grains, so that the casting blank is nearly isotropic, and a tissue foundation is provided for subsequent large deformation. The light rare earth RE has the function of purifying a solution, so that the impurity content in a casting blank can be reduced, and the uniformity of the casting blank is improved; and secondly, the addition of the light rare earth RE can refine precipitated phases in the alloy, and the strength and the conductivity of a final product are improved.
(2) The idea of preparing the high-precision strip by cutting the edge and dividing the strip of the traditional wide strip is skipped, and the high-precision strip is directly prepared, so that the investment cost of equipment is reduced, the size of the casting blank can be effectively reduced, the heat treatment requirement of the casting blank is reduced, and the preparation cost is effectively reduced.
(3) Under the combined action of alloying elements and a new preparation idea, a short-process large-deformation process of high-deformation-resistance small-size Cu-Ni-Co-Si-Li casting becomes possible.
The following is a detailed description with reference to specific examples:
example 1
(1) Vacuum melting, wire blank casting
Putting intermediate alloy such as Cu-5Li, Cu-Ni and the like and high-purity copper into a vacuum intermediate frequency smelting furnace according to a certain proportion, wherein the vacuum degree is-0.1 MPa, continuously introducing high-purity argon into the vacuum intermediate frequency smelting furnace, controlling the temperature of molten liquid at 1160 ℃ during smelting, preserving the temperature for 45min, and then mechanically stirring to obtain mixed molten liquid. Then carrying out wire blank casting on the mixed melt, controlling the casting temperature at 870 ℃, controlling the casting speed at 80mm/min, and controlling the cooling water flow at 50m3And min, obtaining a casting blank with the diameter of 35mm, wherein the casting blank comprises the following components: 1.5 wt.% nickel Ni; 0.8 wt.% cobalt Co; 1.5 wt.% silicon Si; 0.05 wt.% magnesium Mg; lithium Li 0.04 wt.%; 0.1 wt.% light rare earth RE; the balance being copper Cu.
(2) Continuous extrusion
Heating the copper alloy casting blank obtained in the step (1) to 720 ℃, preheating an extrusion die to 620 ℃ for continuous extrusion, wherein the extrusion ratio is 12, the rotating speed of an extrusion wheel is 10rpm, and the extrusion gap is 1.0 mm. Thus obtaining the copper bar with the thickness of 7mm and the width of 80 mm.
(3) Four-roll rolling
And (3) carrying out solution treatment on the copper bar obtained in the step (2) at the temperature of 940 ℃ for 2.5 hours to obtain the soft copper bar. And rolling the soft copper bar on a four-roller rolling mill to obtain a plate with the thickness of 0.9mm and the width of 150 mm.
(4) Twenty high finish rolling
And (4) carrying out solution treatment on the plate obtained in the step (3) at the temperature of 810 ℃ for 1.5 h. And obtaining the copper alloy plate in an annealed state. And then, carrying out finish rolling on the copper alloy plate on a twenty-high rolling mill to obtain a strip with the thickness of 0.6mm and the width of 160 mm.
(5) Solid solution and aging treatment
And (3) carrying out solution heat treatment on the strip obtained in the step (4) at the temperature of 920 ℃, and cooling by water to obtain the solution treated strip. The solution treated strip was then aged at 450 ℃ for 20h to obtain an aged strip.
(6) Trimming and rolling
And (5) cutting edges of the aging-treated strip obtained in the step (5), and rolling to obtain a Cu-Ni-Co-Si-Li system alloy product-Cu-Ni-Co-Si-Li alloy high-precision strip, wherein the performance indexes of the Cu-Ni-Co-Si-Li alloy high-precision strip are shown in table 1.
TABLE 1 EXAMPLE 1Cu-Ni-Co-Si-Li based alloy Properties
Tensile strength (MPa) 692
Yield strength (MPa) 637
Electrical conductivity (% IACS) 50.9
Example 2
(1) Vacuum melting, wire blank casting
Putting intermediate alloys such as Cu-5Li, Cu-Ni and the like and high-purity copper into a vacuum intermediate frequency smelting furnace according to a certain proportion, continuously introducing high-purity argon into the vacuum intermediate frequency smelting furnace at a vacuum degree of-0.1 MPa, controlling the temperature of molten liquid at 1160 ℃ during smelting, preserving the temperature for 45min, and then mechanically stirring to obtain mixed molten liquid. And then carrying out line billet casting on the mixed molten liquid, wherein the casting temperature is controlled to be 870 ℃, the casting speed is controlled to be 80mm/min, the cooling water flow is 50m3/min, and a casting blank with the diameter of 35mm is obtained, and the casting blank comprises the following components: 1.5 wt.% nickel Ni; 0.8 wt.% cobalt Co; 1.5 wt.% silicon Si; 0.05 wt.% magnesium Mg; 0.06 wt.% lithium Li; 0.1 wt.% light rare earth RE; the balance being copper Cu.
(2) Continuous extrusion
Heating the copper alloy casting blank obtained in the step (1) to 750 ℃, preheating an extrusion die to 650 ℃ for continuous extrusion, wherein the extrusion ratio is 15, the rotating speed of an extrusion wheel is 8rpm, and the extrusion gap is 1.0 mm. The copper bar with the thickness of 7mm and the width of 80mm is obtained.
(3) Four-roll rolling
And (3) carrying out solution treatment on the copper bar obtained in the step (2) at the temperature of 940 ℃ for 2.5 hours to obtain the soft copper bar. And rolling the soft copper bar on a four-roller rolling mill to obtain a plate with the thickness of 0.9mm and the width of 150 mm.
(4) Twenty high finish rolling
And (4) carrying out solution treatment on the plate obtained in the step (3) at the temperature of 810 ℃ for 1.5 h. And obtaining the copper alloy plate in an annealed state. And then, carrying out finish rolling on the copper alloy plate on a twenty-high rolling mill to obtain a strip with the thickness of 0.6mm and the width of 160 mm.
(5) Solid solution and aging treatment
And (3) carrying out solution heat treatment on the strip obtained in the step (4) at the temperature of 920 ℃, and cooling by water to obtain the solution treated strip. The solution treated strip was then aged at 450 ℃ for 20h to obtain an aged strip.
(6) Trimming and rolling
And (5) cutting edges of the aging-treated strip obtained in the step (5), and rolling to obtain a Cu-Ni-Co-Si-Li system alloy product-Cu-Ni-Co-Si-Li alloy high-precision strip, wherein the performance indexes of the Cu-Ni-Co-Si-Li alloy high-precision strip are shown in a table 2.
TABLE 2 EXAMPLE 2Cu-Ni-Co-Si-Li based alloy Properties
Tensile strength (MPa) 701
Yield strength (MPa) 642
Electrical conductivity (% IACS) 51.2
Example 3
(1) Vacuum melting, wire blank casting
Putting intermediate alloy such as Cu-5Li, Cu-Ni and the like and high-purity copper into a vacuum intermediate frequency smelting furnace according to a certain proportion, wherein the vacuum degree is-0.1 MPa, continuously introducing high-purity argon into the vacuum intermediate frequency smelting furnace, controlling the temperature of molten liquid at 1160 ℃ during smelting, preserving the temperature for 45min, and then mechanically stirring to obtain mixed molten liquid. And then carrying out line billet casting on the mixed molten liquid, wherein the casting temperature is controlled to be 870 ℃, the casting speed is controlled to be 80mm/min, the cooling water flow is 50m3/min, and a casting blank with the diameter of 35mm is obtained, and the casting blank comprises the following components: 1.5 wt.% nickel Ni; 0.8 wt.% cobalt Co; 1.5 wt.% silicon Si; 0.05 wt.% magnesium Mg; lithium Li:0.08 wt.%; 0.1 wt.% light rare earth RE; the balance being copper Cu.
(2) Continuous extrusion
And (2) heating the copper alloy casting blank obtained in the step (1) to 780 ℃, preheating an extrusion die to 680 ℃ for continuous extrusion, wherein the extrusion ratio is 18, the rotating speed of an extrusion wheel is 6rpm, and the extrusion gap is 1.0 mm. The copper bar with the thickness of 7mm and the width of 80mm is obtained.
(3) Four-roll rolling
And (3) carrying out solution treatment on the copper bar obtained in the step (2) at the temperature of 940 ℃ for 2.5 hours to obtain the soft copper bar. And rolling the soft copper bar on a four-roller rolling mill to obtain a plate with the thickness of 0.9mm and the width of 150 mm.
(4) Twenty high finish rolling
And (4) carrying out solution treatment on the plate obtained in the step (3) at the temperature of 810 ℃ for 1.5 h. And obtaining the copper alloy plate in an annealed state. And then, carrying out finish rolling on the copper alloy plate on a twenty-high rolling mill to obtain a strip with the thickness of 0.6mm and the width of 160 mm.
(5) Solid solution and aging treatment
And (3) carrying out solution heat treatment on the strip obtained in the step (4) at the temperature of 920 ℃, and cooling by water to obtain the solution treated strip. And then carrying out aging treatment on the strip subjected to the solution heat treatment at 450 ℃ for 20h to obtain an aging treated strip.
(6) Trimming and rolling
And (5) cutting edges of the aging-treated strip obtained in the step (5), and rolling to obtain a Cu-Ni-Co-Si-Li system alloy product-Cu-Ni-Co-Si-Li alloy high-precision strip, wherein the performance indexes of the Cu-Ni-Co-Si-Li alloy high-precision strip are shown in a table 3.
TABLE 3 EXAMPLE 3Cu-Ni-Co-Si-Li based alloy Properties
Tensile strength (MPa) 724
Yield strength (MPa) 648
Electrical conductivity (% IACS) 51.9
The foregoing shows and describes the general principles, essential features, and advantages of the application. It will be understood by those skilled in the art that the present application is not limited to the embodiments described above, which are presented solely for purposes of illustrating the principles of the application, and that various changes and modifications may be made without departing from the spirit and scope of the application, which is defined by the appended claims, the specification, and equivalents thereof.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application and not for limiting the protection scope of the present application, and although the present application is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application.

Claims (10)

1. A short-process preparation method of a high-strength high-conductivity Cu-Ni-Co-Si-Li alloy high-precision strip is characterized by comprising the following steps:
the method comprises the following steps of carrying out vacuum melting on raw materials to obtain mixed molten liquid, and carrying out wire blank casting on the mixed molten liquid to obtain a casting blank, wherein the casting blank comprises the following components: 1.0-2.0 wt.% nickel, 0.5-1.0 wt.% cobalt, 1-2 wt.% silicon, 0-0.1 wt.% magnesium, 0.03-0.1 wt.% lithium, 0.05-0.2 wt.% light rare earth, and the balance copper;
continuously extruding the casting blank to obtain a copper bar;
binding the copper bar to obtain a plate;
performing finish rolling on the plate to obtain a strip;
carrying out solid solution treatment on the strip to obtain a solid solution treated strip, and carrying out aging treatment on the solid solution product to obtain an aging treated strip;
and trimming and rolling the aging-treated strip to obtain the high-precision strip.
2. The short-run preparation process according to claim 1, wherein,
in the vacuum smelting process, the raw materials are placed into a vacuum smelting furnace, the vacuum degree is-0.1 MPa, argon is continuously introduced into the vacuum smelting furnace, the temperature of the molten liquid is controlled to be 1120-fold-sand 1200 ℃ during smelting, and mechanical stirring is carried out after heat preservation is carried out for 30-60 min.
3. The short-run preparation process according to claim 1, wherein,
in the line blank casting process, the casting temperature is controlled at 800-950 ℃, the casting speed is controlled at 70-100mm/min, and the cooling water flow is 40-60m3/min, so as to obtain a casting blank with phi of 25-40 mm.
4. The short-run preparation process according to claim 1, wherein,
in the continuous extrusion process, the casting blank is heated to 800 ℃ for 700-. Obtaining the copper bar with the thickness of 5-8mm and the width of 60-100 mm.
5. The short-run preparation process according to claim 1, wherein,
and in the rolling process, carrying out solution treatment on the copper bar to obtain a soft copper bar, and then rolling the soft copper bar on a four-roller rolling mill to obtain a plate with the thickness of 0.8-1mm and the width of 120-180 mm.
6. The short-run preparation process according to claim 5, wherein,
carrying out solution treatment on the copper bar, comprising the following steps:
and carrying out solution treatment on the copper bar at the temperature of 860-1020 ℃ for 2-3 h.
7. The short-run preparation process according to claim 1, wherein,
in the finish rolling process, carrying out solid solution treatment on the plate to obtain an annealed copper alloy plate, and then carrying out finish rolling on the copper alloy plate on a twenty-high rolling mill to obtain a strip with the thickness of 0.4-0.8mm and the width of 140-200 mm;
preferably, the sheet material is solution treated, comprising:
the plate is subjected to solution treatment at the temperature of 700 ℃ and 920 ℃ for 1-2 h.
8. The short-run preparation process according to claim 1, wherein,
in the solution treatment process, the strip is subjected to solution heat treatment at the temperature of 850-1000 ℃, and the cooling mode is water cooling.
9. The short-run preparation process according to claim 1, wherein,
in the aging treatment process, the aging treatment is carried out on the solution treatment strip at the temperature of 400-500 ℃ for 18-24 h.
10. A high-strength high-conductivity Cu-Ni-Co-Si-Li alloy is characterized in that 1.0-2.0 wt.% of nickel, 0.5-1.0 wt.% of cobalt, 1-2 wt.% of silicon, 0-0.1 wt.% of magnesium Mg, 0.03-0.1 wt.% of lithium, 0.05-0.2 wt.% of light rare earth and the balance of copper.
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