CN113857482B - Oriented graphene composite aluminum conductor rod for overhead cable and preparation process thereof - Google Patents
Oriented graphene composite aluminum conductor rod for overhead cable and preparation process thereof Download PDFInfo
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- CN113857482B CN113857482B CN202111126032.2A CN202111126032A CN113857482B CN 113857482 B CN113857482 B CN 113857482B CN 202111126032 A CN202111126032 A CN 202111126032A CN 113857482 B CN113857482 B CN 113857482B
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- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
- B22F7/08—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools with one or more parts not made from powder
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/18—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by using pressure rollers
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
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Abstract
The invention discloses a directional graphene composite aluminum conductor rod material for an overhead cable and a preparation process thereof. According to the invention, by providing a new graphene composite conductor rod structure and new graphene composite aluminum conductor rod components, a preparation process of the directional graphene reinforced aluminum conductor rod for the overhead cable is developed, so that the aluminum conductor rod is light, the conductivity of the aluminum conductor rod is not obviously reduced, and meanwhile, the elastic modulus and tensile strength of the aluminum rod are obviously improved, and the durability and practicability of the conductor rod are greatly improved.
Description
Technical Field
The invention relates to the technical field of power transmission cable manufacturing, in particular to a graphene composite aluminum conductor rod material for an overhead cable and a preparation process thereof.
Background
Overhead power transmission cables play an extremely important role in electric power transmission lines as a main power transmission carrier. The metal aluminum is used as a light metal material, has good conductivity, and has a very wide application prospect in the field of cables. The conductivity and the strength of the aluminum alloy are a pair of contradictory properties, and the strength of the metal aluminum can be obviously improved in the alloying process, but the conductivity can be obviously reduced. In order to ensure the conductivity of the cable, the overhead cable conductor used in the market is generally made of industrial pure aluminum, but is limited by the strength of the pure aluminum, the cable adopted at the present stage generally takes a high-strength steel wire as a bearing core, and the weight of the bearing core exceeds the weight of the cable conductor.
No matter new line construction or old line transformation, a novel cable with light weight, high modulus and high strength is needed. Along with the high-speed development of social economy, the land resources are increasingly tense, and the approval and new establishment of a new channel of an overhead transmission line become the outstanding difficult problem of power grid construction. The improvement of the strength of the cable conductor body and the reduction of the proportion of the bearing core in the cable are one of the development routes of novel cables.
Graphene is the toughest, the best material for electrical and thermal conductivity found in laboratories to date, and has a tensile strength of up to 130GPa and a theoretical tensile modulus of up to 1000GPa. In addition, the graphene has a characteristic wrinkle unfolding and re-breaking process when stressed, so that the graphene has good toughness and plasticity. By benefiting from the advantages of the graphene, the graphene is added into the aluminum alloy, and the combination of good mechanical property and high conductivity of the aluminum alloy is expected to be obviously realized. However, the technology of applying graphene to the manufacture of cables in the prior art is not mature enough, so that the quality of the cables does not reach the ideal performance.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art, and provides an oriented graphene composite aluminum conductor rod material for an overhead cable, which can realize light aluminum conductor rod material, has no obvious reduction of conductivity, obviously improves the elastic modulus and tensile strength of the aluminum rod material, and greatly improves the durability and practicability of the conductor rod material, and a preparation process thereof.
In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides a compound aluminium conductor pole material of directional graphite alkene for overhead cable, including aluminum alloy shell and core, the cladding of aluminum alloy shell is at the outside shell core structure that forms of core, its characterized in that: the core material is made of an oriented graphene reinforced aluminum alloy composite material, the sectional area of the core material accounts for 10-70% of the total sectional area of the whole rod material, the graphene is a reinforcing phase and accounts for 0.1-3% of the weight of the core material, and the balance is aluminum alloy; the sheet layer of the graphene is parallel to the aluminum alloy shell to form concentric orientation, and is parallel to the length direction.
The composition of the aluminium alloy used to make the core is as follows: fe: less than or equal to 0.25%, si:0.02 to 0.20%, mn: less than or equal to 0.15 percent, cu: less than or equal to 0.04 percent, RE:0.001-0.006%, be:0.001-0.002%, zr:0.06-0.10%, sc:0.004-0.006%, zn: less than or equal to 0.04 percent, and the balance of aluminum, and of course, some inevitable impurities can be included.
The graphene is produced in the same batch, the fluctuation of the thickness distribution and the fluctuation of the particle size distribution of the graphene are less than 5%, the graphene is single-layer graphene or multi-layer graphene, and the maximum thickness of the graphene is less than or equal to 10nm; the average number of the graphene sheets is 3-5, and the maximum thickness is less than or equal to 7nm.
The aluminum alloy shell is an aluminum alloy added with manganese and magnesium, wherein the content of magnesium is 4.0-5.4%, and the content of manganese is 0.5-1.0%; the outer diameter of the aluminum alloy shell is 3-15 mm, and the thickness is 0.3-5 mm.
A preparation process of a directional graphene composite aluminum conductor rod material for an overhead cable is based on the above, and is characterized in that: adopting a continuous production line with the linear speed of 0.1-5 m/s, and performing the following steps,
step S1: the composite material for manufacturing the core material is prepared by a powder metallurgy method, and is subjected to batching, mixing and vacuum drying treatment to obtain powder with uniformly mixed aluminum/graphene;
step S2: the method adopts a batch filling multi-pass rolling process, eliminates pores among mixed powder, and promotes the orientation of graphene sheets; feeding the aluminum/graphene mixed powder prepared in the step S1 to an aluminum alloy strip through a certain feeding port of a feeding system at a constant speed according to a set feeding speed, and cold-rolling by adopting a die with the width slightly smaller than that of the aluminum alloy strip to improve the density of the mixed powder, wherein the aluminum alloy strip synchronously deforms; continuously feeding the aluminum alloy strip into the next feeding port, and repeating the steps until the aluminum alloy strip is completely converted into a U-shaped open aluminum alloy pipe and the inside of the aluminum alloy pipe is filled with the aluminum/graphene mixed powder; after the rolling process is finished, the graphene sheet layers are concentrically distributed in the U-shaped open aluminum alloy pipe;
and step S3: preliminarily rolling the U-shaped opening aluminum alloy pipe filled with the aluminum/graphene mixed powder prepared in the step S2, and reducing the U-shaped opening to be completely closed after the preliminary rolling so as to enable the U-shaped opening aluminum alloy pipe to be a complete tubular aluminum alloy shell, such as an O-shaped shell;
and step S4: welding the gap of the aluminum alloy shell prepared in the step S3 to obtain an aluminum alloy conductor bar material which is completely closed but has not yet completely compact core material;
step S5: performing multi-pass cold rolling on the aluminum alloy conductor rod material prepared in the step S4, removing pores among powder and between the powder and the aluminum alloy shell, improving the density of the core material, and performing annealing treatment after each step of rolling is completed so as to adjust the internal stress of the aluminum alloy conductor rod material; monitoring internal stress residue through hardness detection, and enabling the hardness increase value to be not more than 70% compared with that before extrusion;
step S6: hot rolling the aluminum alloy conductor rod prepared in the step S5 to further improve the density of the aluminum alloy conductor rod and promote the powder to form stable and effective metallurgical connection with the powder and the aluminum alloy shell;
step S7: and (5) placing the aluminum alloy conductor rod material prepared in the step (S6) into a heat treatment furnace for treatment, heating to 270-350 ℃, and preserving heat for 2-3h to complete the final performance regulation and control of the conductor.
In the step S1, batching is carried out according to the required metered graphene slurry, aluminum alloy powder and organic solvent, wherein the content of graphene is 0.01-3%;
the mixing method comprises the following steps:
1) Adding aluminum alloy powder into the graphene slurry to obtain aluminum/graphene mixed slurry, and adding an organic solvent according to the viscosity of the mixed slurry to enable the viscosity of the mixed slurry to be proper, wherein the organic solvent is at least one of ethanol, dichloromethane and chloroform;
2) Fully grinding and mixing the mixed slurry to obtain an aluminum/graphene blank; grinding and mixing are carried out by adopting high-energy ball milling and mixing or high-speed dispersion to prepare uniform composite slurry;
the vacuum drying is to put the aluminum/graphene slurry into a vacuum drying oven for vacuum drying, remove the organic solvent in the aluminum/graphene slurry, and finally obtain aluminum/graphene mixed powder; the drying temperature is 50-80 ℃, the heat preservation time is more than or equal to 48 hours, and the vacuum degree is less than or equal to 0.03MPa.
In the step S2, the aluminum alloy strip is rolled and welded to form an aluminum alloy shell, the width of the aluminum alloy shell is the same as the circumference of a circle with the outer diameter of 5-20mm, the thickness of the aluminum alloy shell is 1-5mm, and the width of a U-shaped opening formed by filling aluminum/graphene powder for rolling is 1-18mm;
the feeding system comprises a plurality of feeding ports which are linearly distributed, the feeding speed of any one feeding port can be independently adjusted, the feeding system is kept static, and the aluminum alloy strip passes through the feeding system at a constant speed; the feeding speed and the moving speed of the aluminum alloy strip can be adjusted according to the width dimension d and the opening dimension of the aluminum alloy strip so as to ensure that the aluminum/graphene powder is completely paved on the aluminum alloy strip;
the batch filling process is to complete the filling of the required mixed powder from a single feeding port or fill the mixed powder from a plurality of feeding ports in batches according to the size of the aluminum alloy strip; the multi-pass rolling process is to perform cold rolling after any feeding port is filled, and the cold rolling times are consistent with the filling times of the mixed powder;
any feeding port is filled with mixed powder, the thickness of the rolled mixed powder is less than or equal to 1.5mm, the density is more than or equal to 60 percent, and the deformation of the aluminum alloy strip is less than or equal to 6 percent; more preferably, the thickness of the material is 0.3-1mm, and the density is more than or equal to 70 percent;
the preferred orientation of the graphene sheet layer is that the graphene sheet layer and the aluminum alloy shell form a concentric structure after being subjected to multi-pass cold rolling under the driving of rolling force.
In step S4, a pressure welding or fusion welding process is applied to the gap of the aluminum alloy case.
In step S5, the single-pass cold rolling deformation rate is less than or equal to 9 percent, and the total deformation is more than 50 percent; the rolling speed range is 130-170mm/s; the density of the core material of the cold-rolled aluminum alloy conductor rod is more than or equal to 75 percent, and more preferably more than or equal to 85 percent;
in the cold rolling process, due to the combined action of rolling force and powder flow, the concentric graphene sheet layers are subjected to secondary directional distribution along the length direction parallel to the aluminum alloy conductor rod material, and the included angle between the graphene sheet layers and the aluminum alloy conductor rod material in the length direction is less than or equal to 5 degrees.
In step S6, the temperature in the hot rolling process is 300-570 ℃, the rolling pressure is 70-300MPa, and the density of the core part of the aluminum alloy conductor rod material is more than or equal to 99%.
According to the invention, the aluminum alloy conductor rod material is reinforced by adopting the oriented graphene, so that the tensile strength of the conductor rod material is improved by more than 90% compared with that of pure aluminum, the elastic modulus is improved by more than 10%, and the performances of the aluminum alloy conductor rod material in the circumferential direction are consistent on the premise of not remarkably reducing the conductivity of the aluminum alloy conductor;
secondly, preparing the aluminum alloy conductor rod material by adopting processes such as cold rolling and the like, refining crystal grains in the production process, promoting secondary orientation of graphene sheet layers and further improving the strength of the aluminum conductor rod material;
thirdly, by controlling the process conditions of the preparation process of the aluminum alloy conductor bar material, the harmful phase Al is effectively inhibited 4 C 3 And (4) generating. This is because of Al 4 C 3 Under the condition of high temperature (not less than 500 ℃) or in the molten aluminum (melting point 670 ℃), the aluminum and the carbon material react rapidly to generate the aluminum-containing material. The invention adopts a hot rolling process, can promote the aluminum material and the carbon material to form metallurgical connection, reduce the temperature of the aluminum material and the carbon material when the aluminum material and the carbon material are contacted, and shorten the contact time of the aluminum material and the carbon materialContribute to the suppression of Al 4 C 3 Generating;
fourthly, a shell-core structure is adopted, and a layer of corrosion-resistant aluminum alloy shell is coated on the outer layer of the graphene-aluminum alloy composite material, so that the conductive capacity of the aluminum conductor rod material can be increased, and the corrosion resistance of the aluminum conductor rod material can be improved.
Drawings
FIGS. 1 to 6 are schematic cross-sectional views of typical shapes of the aluminum alloy conductor bar according to the present invention;
FIG. 7 is a flow chart of the manufacturing process of the present invention.
Detailed Description
The invention is further described with reference to the following drawings and specific embodiments. In the present embodiment, all the parts and percentages are by weight unless otherwise specified. All the raw materials can be purchased from the market or belong to raw materials commonly used in the industry.
In the embodiment, the cross section is circular, and the equivalent cross section area is 50mm 2 The aluminum alloy conductor bar of (1) will be described as an example. The content of the graphene is 1%, and the aluminum alloy shell comprises the following components: 4.5 to 5.0 percent of Mg4, 0.6 to 1.0 percent of Mn0, less than 0.1 percent of impurity elements and the balance of aluminum, and the thickness is 1mm. The specific manufacturing process comprises the following steps:
s1: preparing raw materials according to the content of the graphene of 1%. Weighing 1.98kg of aluminum alloy powder with the nominal particle size of 20 mu m; taking 0.5kg of absolute ethyl alcohol graphene slurry with the concentration of 4% and the thickness of a nominal graphene sheet layer of 5 nm; adding a proper amount of absolute ethyl alcohol to adjust the viscosity of the mixture; mixing the mixture at a mixing speed of 150rpm for 90min to obtain mixed slurry; putting the mixed slurry into a vacuum oven, wherein the drying temperature is 68 ℃, the heat preservation time is 60 hours, and the vacuum degree is 0.03MPa, so as to obtain mixed powder;
s2: selecting an aluminum alloy strip, wherein the content of Mg element is 4.5%, the content of Mn element is 0.8%, the width of the aluminum alloy strip is 37.5mm, and the thickness of the aluminum alloy strip is 1.5mm. According to the size of the aluminum alloy strip, a filling mode is selected to fill with a plurality of feeding openings, and multiple times of rolling compaction are needed. The density of the aluminum/graphene mixed powder is 25%, the aluminum alloy strip is close to the feeding system at 100mm/s, and the mixed powder is respectively fed to the aluminum alloy strip from 6 feeding ports at constant speed of 339 ml/min; a convex roller with the width of 35mm is adopted behind each feeding port, and the powder is subjected to cold rolling to improve the density; the aluminum alloy powder layer put in the single feeding port is rolled and then converted into a mixed material strip with the thickness of 1mm and the density of 75%, and the mixed material strip and the aluminum alloy coating layer are in a concentric circle structure; meanwhile, the aluminum alloy strip is deformed synchronously under the action of rolling force, and the deformation amount is about 7%; after all the feeding openings are filled and rolled to deform, the aluminum alloy strip is converted into a U-shaped aluminum alloy semi-open pipe, and a primarily compact concentric circle graphene sheet layer and an aluminum powder mixture are arranged inside the U-shaped aluminum alloy semi-open pipe;
s3: in the step S2, the aluminum alloy tube fully filled with the mixture powder is subjected to cold rolling closing, and the rolled U-shaped aluminum alloy semi-open tube is converted into an O-shaped aluminum alloy tube with the outer diameter of about 12mm;
s4: then, fusion welding-cold metal transition welding is adopted to ensure that the welding seam has no defects of undercut, incomplete fusion and the like, the protective gas is high-purity argon with the purity of more than 99.999 percent, and the gas flow is 25L/min;
s5: after welding, heating the cable to 320 ℃, keeping the temperature for 10min, performing stress relief annealing, cooling to room temperature, starting cold rolling, wherein the single-pass deformation is 8%, the rolling passes are 4 times, and after the final cold rolling is finished, the diameter of the aluminum alloy conductor rod is about 8.6mm;
s6: after cold rolling is finished, replacing an arc-shaped hot rolling die, preheating the die to 480 ℃ after the replacement is finished, and then putting the cold-rolled aluminum alloy conductor rod into the die for hot rolling until the oriented graphene composite aluminum conductor rod with the circular cross section and the equivalent diameter of 8mm is obtained;
step S7: the graphene composite aluminum conductor rod material prepared in the step S6 is coiled and placed in a heat treatment furnace, the temperature is raised to 320 ℃, the temperature is kept for 2 hours, the stress relief annealing of the aluminum alloy conductor rod material is completed, and the strength of the aluminum alloy conductor rod material is improved;
the results of the performance test are shown in Table 1. As can be seen from table 1, the aluminum alloy conductor rod material reinforced by adding graphene in the invention has higher mechanical strength and tensile modulus than a pure aluminum conductor rod material, but the electrical conductivity is slightly reduced. The tensile property and the tensile modulus are respectively improved by 111.2 percent and 14.1 percent compared with pure aluminum.
TABLE 1% graphene/aluminum alloy Performance test results
While the invention has been described in detail in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (10)
1. The utility model provides a compound aluminium conductor pole material of directional graphite alkene for overhead cable, including aluminum alloy shell and core, the cladding of aluminum alloy shell is at the outside shell core structure that forms of core, its characterized in that: the core material is made of an oriented graphene reinforced aluminum alloy composite material, the sectional area of the core material accounts for 10-70% of the total sectional area of the whole rod material, the graphene is a reinforcing phase and accounts for 0.1-3% of the weight of the core material, and the balance is aluminum alloy; the sheet layer of the graphene is parallel to the aluminum alloy shell to form concentric orientation, and is parallel to the length direction.
2. The oriented graphene composite aluminum conductor bar for overhead cables according to claim 1, wherein: the composition of the aluminium alloy used to make the core is as follows: fe: less than or equal to 0.25 percent, si:0.02-0.20%, mn: less than or equal to 0.15 percent, cu: less than or equal to 0.04%, RE:0.001-0.006%, be:0.001-0.002%, zr:0.06-0.10%, sc:0.004-0.006%, zn: less than or equal to 0.04 percent, and the balance of aluminum.
3. The oriented graphene composite aluminum conductor bar material for overhead cables according to claim 1, wherein: the graphene is produced in the same batch, the fluctuation of the thickness distribution and the fluctuation of the particle size distribution of the graphene are less than 5%, the graphene is multilayer graphene, and the maximum thickness of the graphene is less than or equal to 10nm; the average number of sheets of graphene is 3-5.
4. The oriented graphene composite aluminum conductor bar for overhead cables according to claim 1, wherein: the aluminum alloy shell is an aluminum alloy added with manganese and magnesium, wherein the content of the magnesium is 4.0-5.4%, and the content of the manganese is 0.5-1.0%; the outer diameter of the aluminum alloy shell is 3-15mm, and the thickness of the aluminum alloy shell is 0.3-5mm.
5. The preparation process of the oriented graphene composite aluminum conductor rod material for the overhead cable based on the claim 1 is characterized by comprising the following steps of: adopting a continuous production line, wherein the linear speed is 0.1 to 5m/s, and the method comprises the following steps of,
step S1: the composite material for manufacturing the core material is prepared by a powder metallurgy method, and is subjected to batching, mixing and vacuum drying treatment to obtain powder with uniformly mixed aluminum/graphene;
step S2: the method adopts a batch filling multi-pass rolling process, eliminates pores among mixed powder, and promotes the orientation of graphene sheets; feeding the aluminum/graphene mixed powder prepared in the step S1 to an aluminum alloy strip through a certain feeding port of a feeding system at a constant speed according to a set feeding speed, and cold-rolling by adopting a die with the width slightly smaller than that of the aluminum alloy strip to improve the density of the mixed powder, wherein the aluminum alloy strip synchronously deforms; continuously feeding the aluminum alloy strip at the next feeding port, and repeating the steps until the aluminum alloy strip is completely converted into an aluminum alloy pipe with a U-shaped opening, and the interior of the aluminum alloy pipe is filled with aluminum/graphene mixed powder; after the rolling process is finished, the graphene sheet layers are concentrically distributed in the U-shaped open aluminum alloy pipe;
and step S3: preliminarily rolling the U-shaped opening aluminum alloy pipe filled with the aluminum/graphene mixed powder prepared in the step S2, and reducing the U-shaped opening to be completely closed after the preliminary rolling so as to enable the U-shaped opening aluminum alloy pipe to be a complete tubular aluminum alloy shell;
and step S4: welding the gap of the aluminum alloy shell prepared in the step S3 to obtain an aluminum alloy conductor bar material which is completely closed but not completely compact in core material;
step S5: performing multi-pass cold rolling on the aluminum alloy conductor rod material prepared in the step S4, removing pores among powder and between the powder and the aluminum alloy shell, improving the density of the core material, and performing annealing treatment after each step of rolling is completed so as to adjust the internal stress of the aluminum alloy conductor rod material; monitoring internal stress residue through hardness detection, and enabling the hardness increase value to be not more than 70% compared with that before extrusion;
step S6: hot rolling the aluminum alloy conductor rod prepared in the step S5 to further improve the density of the aluminum alloy conductor rod and promote the powder to form stable and effective metallurgical connection with the powder and the aluminum alloy shell;
step S7: and (4) placing the aluminum alloy conductor rod prepared in the step (S6) into a heat treatment furnace for treatment, heating to 270-350 ℃, and preserving heat for 2-3 hours to finish the final performance regulation and control of the conductor.
6. The production process according to claim 5, characterized in that: in the step S1, batching is carried out according to the required metered graphene slurry, aluminum alloy powder and organic solvent, wherein the content of graphene is 0.01-3%;
the mixing method comprises the following steps:
1) Adding aluminum alloy powder into the graphene slurry to obtain aluminum/graphene mixed slurry, and adding an organic solvent according to the viscosity of the mixed slurry to enable the viscosity of the mixed slurry to be proper, wherein the organic solvent is at least one of ethanol, dichloromethane and chloroform;
2) Fully grinding and mixing the mixed slurry to obtain an aluminum/graphene blank; grinding and mixing are carried out by adopting high-energy ball milling and mixing or high-speed dispersion to prepare uniform composite slurry;
the vacuum drying is to put the aluminum/graphene slurry into a vacuum drying oven for vacuum drying, remove the organic solvent in the aluminum/graphene slurry, and finally obtain aluminum/graphene mixed powder; the drying temperature is 50-80 ℃, the heat preservation time is more than or equal to 48 hours, and the vacuum degree is less than or equal to 0.03MPa.
7. The production process according to claim 5, characterized in that: in the step S2, the aluminum alloy strip is rolled and welded to form an aluminum alloy shell, the width of the aluminum alloy shell is the same as the circumference of a circle with the outer diameter of 5-20mm, the thickness of the aluminum alloy shell is 1-5mm, and the width of a U-shaped opening formed by filling aluminum/graphene powder for rolling is 1-18mm;
the feeding system comprises a plurality of feeding ports which are linearly distributed, the feeding speed of any one feeding port can be independently adjusted, the feeding system is kept static, and the aluminum alloy strip passes through the feeding system at a constant speed; the feeding speed and the moving speed of the aluminum alloy strip can be adjusted according to the width dimension d and the opening dimension of the aluminum alloy strip so as to ensure that the aluminum/graphene powder is completely paved on the aluminum alloy strip;
the batch filling process is to complete the filling of the required mixed powder from a single feeding port or fill the mixed powder from a plurality of feeding ports in batches according to the size of the aluminum alloy strip; the multi-pass rolling process is that cold rolling is carried out after any feeding port is filled with filler, and the cold rolling frequency is consistent with the filling frequency of the mixed powder;
any feeding port is filled with mixed powder, the thickness of the rolled mixed powder is less than or equal to 1.5mm, the density is more than or equal to 60 percent, and the deformation of the aluminum alloy strip is less than or equal to 6 percent;
the preferred orientation of the graphene sheet layer is that the graphene sheet layer and the aluminum alloy shell form a concentric structure after being subjected to multi-pass cold rolling under the driving of rolling force.
8. The production process according to claim 5, characterized in that: in step S4, a pressure welding or fusion welding process is applied to the gap of the aluminum alloy case.
9. The production process according to claim 5, characterized in that: in step S5, the single-pass cold rolling deformation rate is less than or equal to 9 percent, and the total deformation is more than 50 percent; the rolling speed range is 130-170mm/s; the density of the core mixed material of the cold-rolled aluminum alloy conductor rod is more than or equal to 75 percent;
in the cold rolling process, due to the combined action of rolling force and powder flow, the concentric graphene sheet layers are subjected to secondary directional distribution along the length direction parallel to the aluminum alloy conductor rod material, and the included angle between the graphene sheet layers and the aluminum alloy conductor rod material in the length direction is less than or equal to 5 degrees.
10. The process according to claim 5, characterized in that: in step S6, the temperature in the hot rolling process is 300-570 ℃, the rolling pressure is 70-300MPa, and the density of the core part of the aluminum alloy conductor rod material is more than or equal to 99%.
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