CN112331384A - High-performance power cable and preparation method and application thereof - Google Patents

High-performance power cable and preparation method and application thereof Download PDF

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CN112331384A
CN112331384A CN202011188896.2A CN202011188896A CN112331384A CN 112331384 A CN112331384 A CN 112331384A CN 202011188896 A CN202011188896 A CN 202011188896A CN 112331384 A CN112331384 A CN 112331384A
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layer
alloy
power cable
alloy wire
temperature
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巨佳
巴志新
胡亮
闫晨
于皓
刘欢
李旋
李华冠
强新发
姚涵宇
陶学伟
陈露瑶
陈诗怡
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Nanjing Institute of Technology
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/0009—Details relating to the conductive cores
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/02—Fibres or whiskers
    • C08K7/04—Fibres or whiskers inorganic
    • C08K7/08—Oxygen-containing compounds
    • 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
    • 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
    • C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
    • 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
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
    • C23C10/18—Solid state diffusion of only metal elements or silicon into metallic material surfaces using liquids, e.g. salt baths, liquid suspensions
    • C23C10/26—Solid state diffusion of only metal elements or silicon into metallic material surfaces using liquids, e.g. salt baths, liquid suspensions more than one element being diffused
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/1875—Multi-layer sheaths
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
    • H01B7/2813—Protection against damage caused by electrical, chemical or water tree deterioration
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/29—Protection against damage caused by extremes of temperature or by flame
    • H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables
    • H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
    • H01B9/023—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients composed of helicoidally wound tape-conductors
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/011—Nanostructured additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/02—Flame or fire retardant/resistant
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/20—Applications use in electrical or conductive gadgets
    • C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating

Abstract

The invention discloses a high-performance power cable which comprises a conductor material layer, an XLPE insulating layer, a metal shielding layer, a wrapping inner liner layer, a flame-retardant wrapping tape layer and a flame-retardant outer sheath layer which are sequentially arranged from inside to outside. The invention also discloses a manufacturing method and application of the high-performance power cable. The invention can effectively isolate the conductor material from the oxidation environment, so that the conductor material has strong oxidation resistance, and meanwhile, Nb and La are segregated in the grain boundary to form Cu13Nb7La5The metallic compound greatly reduces the temperature sensitivity of conductor materials, and the molecular structure change after modification enables the modified polytetrafluoroethylene to have strong wear resistance and high flame retardance by inclusion of nano magnesium carbonate whiskers in a tetrafluoropropene polymer chain, thereby obviously prolonging the service life and improving the safety performance of a power cable.

Description

High-performance power cable and preparation method and application thereof
Technical Field
The invention relates to a high-performance power cable and a preparation method and application thereof, and belongs to the technical field of power cables.
Background
Since the first use of power cables in the uk in 1890, power cables have been developed for centuries to date. During this period, the cable line has undergone important projects such as paper-insulated cable of Delford-London 10kV line in 1890 years, crosslinked polyethylene cable of AC 500kV which was first used in Japan and Japan pumped storage power stations and rural areas in 1988, polypropylene-wood fiber paper composite paper oil-filled cable which has the highest voltage and maximum transmission capacity in the world at present in Japan across the Islands in 2005, and the like.
The development of power cables in China is relatively late, but along with rapid development of social economy and continuous acceleration of urbanization process, power becomes an indispensable element in various industries in China, such as residential life power consumption, industrial production power consumption, medical industry power consumption and the like. Because of the national condition that energy resources and energy requirements are reversely distributed in China, the construction of large-capacity and long-distance high-voltage and ultrahigh-voltage power transmission lines is a necessary choice for the development of the power industry in China. In consideration of the requirements of urban clean construction on resource conservation and environmental friendliness, the power cable power transmission line system is generally used by virtue of the characteristics of small external influence, high power supply reliability, high land resource utilization rate, no influence on urban appearance environment and the like, and the demand of the power cable is increased rapidly along with the further expansion of the urban process. China is in a wide region, is close to the ocean, and is facing a high-speed railway and a submarine cable for long-distance power transmission, which becomes a new direction for power cable development. However, the temperature shock resistance and oxidation resistance of the power cable during long-distance power transmission seriously affect the power transmission effect of the power cable, and thus the development of a high-temperature stable and oxidation resistant power cable is required to meet the long-distance power transmission requirement in the fields of high-speed railways and submarine cables.
In view of the above, there is a need for a high-temperature stable and oxidation-resistant power cable and a preparation method thereof, which are used for solving the problem of long-distance power transmission in the fields of high-speed railways and submarine cables.
Disclosure of Invention
The invention aims to solve the technical problem that the invention provides a high-performance power cable which has strong oxidation resistance, high temperature fluctuation stability, wear resistance, flame retardance and the like.
Meanwhile, the invention provides a manufacturing method of the high-performance power cable, the method can effectively isolate the conductor material from the oxidation environment, so that the conductor material has strong oxidation resistance, and the method can lead Nb and La to be segregated at the grain boundary to form Cu13Nb7La5The metallic compound greatly reduces the temperature sensitivity of the conductor material, and the method also mixes nano magnesium carbonate crystal whisker into the tetrafluoropropene polymer chain, and the molecular structure change after modification enables the modified polytetrafluoroethylene to have strong wear resistance and high flame resistance, thereby obviously prolonging the service life and improving the safety performance of the power cable.
Meanwhile, the invention provides an application of the high-performance power cable in a high-speed railway cable and/or a submarine cable.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the utility model provides a high performance power cable, includes the conductor material layer that sets gradually from inside to outside, XLPE insulating layer, metal shielding layer, winds the package inner liner, fire-retardant band layer and fire-retardant oversheath layer.
The conductor material layer is made of anti-oxidation high-stability multi-structure alloy wires through positive and negative twisting.
The wrapping inner liner layer and the flame-retardant outer sheath layer are both made of modified polytetrafluoroethylene.
Cu is formed on the surface of the antioxidant high-stability multi-structure alloy wire9Al4Ag3A compact alloy layer, wherein a large amount of Cu is distributed at the internal crystal boundary of the oxidation-resistant high-stability multi-structure alloy wire13Nb7La5A metal compound.
A method of manufacturing a high performance power cable comprising the steps of:
s1, adopting anti-oxidation high-stability multi-structure alloy wires to be twisted in the positive and negative directions to serve as a conductor material layer of a power cable;
s2, drawing out crosslinked polyethylene on the surface of the conductor material layer by using extrusion equipment to serve as an XLPE insulating layer;
s3, winding a copper flat belt outside the XLPE insulating layer to serve as a metal shielding layer;
s4, extruding a layer of modified polytetrafluoroethylene on the periphery of the metal shielding layer to serve as a wrapping inner liner layer;
s5, weaving a layer of glass fiber as a flame-retardant belting layer on the periphery of the lapping inner liner layer;
and S6, extruding a layer of modified polytetrafluoroethylene on the periphery of the flame-retardant wrapping tape layer to serve as a flame-retardant outer sheath layer, and forming a final product.
The manufacturing method of the high-performance power cable comprises the following raw materials in percentage by mass:
Figure BDA0002752156350000021
Figure BDA0002752156350000031
the preparation method of the antioxidant high-stability multi-structure alloy wire comprises the following steps:
s1, alloy smelting: the preparation method comprises the following steps of proportioning the raw materials according to the proportion, heating the intermediate alloy of Cu, CuV, CuNi and CuCr to 1500-1580 ℃ for smelting, and after the intermediate alloy is fully molten, mixing the raw materials according to the mass ratio of (3-5): 1, adding a CuLa and CuNb intermediate alloy, heating to 1640-1740 ℃, and fully smelting until the intermediate alloy is completely molten to obtain a molten alloy liquid;
s2, continuous casting and rolling: controlling the casting temperature to be 1610-1710 ℃, and the drawing speed to be 3.6-4.1 m/min, and casting the molten alloy liquid of S1 into an alloy rod; then, continuously rolling, namely performing rough rolling and rolling by a finishing mill set, arranging a water-through cooling device in the process, controlling the initial rolling temperature to be 1105-1120 ℃, controlling the finish rolling temperature to be 950-980 ℃, and simultaneously ensuring that the total reduction rate of finish rolling is more than or equal to 50% to obtain an alloy wire;
s3, surface treatment: and (2) drawing the alloy wire obtained in the step (S2) into a surface treatment furnace for surface pre-infiltration Al-Ag treatment, wherein the Al-Ag is an alloy liquid formed by mixing Al liquid and Ag liquid in a mass ratio of 1:1, and the treatment temperature is as follows: and (3) treating at the temperature of 750-850 ℃ for: 25-35 min;
s4, pressure processing: drawing the alloy wire subjected to surface treatment in the step S3 into a wire drawing die, and drawing the alloy wire to obtain the alloy wire, wherein the wire drawing deformation rate is 65-85%, and the wire drawing temperature is 340-420 ℃;
s5, performance heat treatment: drawing the alloy wire processed under the pressure of S4 into a performance heat treatment combination furnace, and then, feeding the alloy wire into an induction heat treatment tunnel furnace for 30-40 min at 680-750 ℃; and then the alloy wire enters a quenching tank to be rapidly cooled to obtain the antioxidant high-stability multi-structure alloy wire.
Cu is formed on the surface of the antioxidant high-stability multi-structure alloy wire9Al4Ag3A compact alloy layer, wherein a large amount of Cu is distributed at the internal crystal boundary of the oxidation-resistant high-stability multi-structure alloy wire13Nb7La5A metal compound.
The preparation method of the modified polytetrafluoroethylene comprises the following steps:
s1, preparing a tetrafluoroethylene monomer and a hexafluoropropylene monomer in a volume ratio of 4.5: introducing the mixed gas phase of 1.2 into a polymerization kettle, continuously adding a tetrafluoroethylene monomer and a hexafluoropropylene monomer, wherein the adding flow rate of the tetrafluoroethylene monomer is 180-220 mL/min, the adding time is 12-18 min, adjusting the temperature in the polymerization kettle to 33-38 ℃, then adding 8-10 g/L sodium metabisulfite, and starting to carry out polymerization reaction;
s2, continuously and continuously replenishing a gas-phase tetrafluoroethylene monomer, a gas-phase hexafluoropropylene monomer and a solid-phase magnesium carbonate whisker in the polymerization reaction process, wherein the flow rate of the replenished tetrafluoroethylene monomer is 60-70 mL/min; the flow rate of the supplemented hexafluoropropylene monomer is 100-108 mL/min; the supplemented solid-phase magnesium carbonate crystal whisker is 1.2-1.8 mg/min, and the length of the crystal whisker is 10-30 nm; keeping the pressure of the polymerization reaction at 0.77-0.82 MPa, keeping the time of the polymerization reaction at 90-100 min, diluting the obtained dispersion after polymerization with water to the concentration of 440-460 g/L, adjusting the temperature to 25-35 ℃, mechanically stirring for coagulation, washing with water, and drying to obtain the modified polytetrafluoroethylene.
Use of a high performance power cable in a high speed railway cable and/or a submarine cable.
The invention has the following beneficial effects:
1. strong oxidation resistance: the conductor material of the power cable is subjected to surface pre-infiltration Al-Ag treatment in the preparation process, so that the surface of the conductor alloy wire has an alloy diffusion layer with a certain thickness and rich in Al and Ag. Under the strong pressure and medium temperature conditions of subsequent press working, Ag and Al dissolved in the conductor material are precipitated and react with Cu to form Cu9Al4Ag3The alloy layer has the characteristics of low chemical activity, high compactness and strong plasticity, and can effectively isolate the conductor material from an oxidation environment, so that the conductor material has strong oxidation resistance.
2. High stability of temperature fluctuation: the conductor material of the power cable is rich in Nb and La elements, Nb and La are segregated at the grain boundary under specific high pressure and temperature in the pressure processing process, and form Cu with Cu in the subsequent performance heat treatment process13Nb7La5The metal compound is distributed at the grain boundary of the matrix. Cu13Nb7La5The metal compound has very low temperature sensitivity, and the temperature sensitivity of the conductor material can be greatly reduced by the metal compound distributed at the crystal boundary, so that the fluctuation range of the conductivity along with the temperature change of the conductor material is reduced in a large temperature span range, and the temperature fluctuation stability of the conductor material is improved.
3. Excellent wear-resistant flame retardant properties: the wrapping inner liner layer and the flame-retardant outer sheath layer of the power cable are made of modified polytetrafluoroethylene. In the modification process of the polytetrafluoroethylene, nano magnesium carbonate whiskers are included in a tetrafluoropropene polymer chain under specific pressure and temperature. The molecular structure change after modification enables the modified polytetrafluoroethylene to have strong wear resistance and high flame retardance, and the service life and the safety performance of the power cable are obviously prolonged.
Drawings
FIG. 1 is a schematic view of a power cable according to the present invention;
FIG. 2 is a microstructure diagram of the oxidation-resistant highly stable multi-structural alloy wire of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. The specific embodiments described herein are merely illustrative of the invention and are not intended to be limiting.
Example 1:
as shown in fig. 1, a high performance power cable comprises a conductor material layer 1, an XLPE insulating layer 2, a metal shielding layer 3, a wrapping inner liner layer 4, a flame-retardant wrapping tape layer 5 and a flame-retardant outer sheath layer 6 which are arranged from inside to outside in sequence.
The conductor material layer 1 is made of anti-oxidation high-stability multi-structure alloy wires through positive and negative twisting.
The wrapping inner liner layer 4 and the flame-retardant outer sheath layer 6 are both made of modified polytetrafluoroethylene.
The XLPE insulating layer 2 is made of cross-linked polyethylene.
The metal shielding layer 3 is made of a copper flat belt.
The flame-retardant belting layer 5 is made of glass fiber.
Cu is formed on the surface of the antioxidant high-stability multi-structure alloy wire9Al4Ag3A compact alloy layer, wherein a large amount of Cu is distributed at the internal crystal boundary of the oxidation-resistant high-stability multi-structure alloy wire13Nb7La5A metal compound.
A method of manufacturing a high performance power cable comprising the steps of:
s1, adopting anti-oxidation high-stability multi-structure alloy wires to be twisted in the positive and negative directions to serve as a conductor material layer 1 of the power cable;
s2, drawing out crosslinked polyethylene on the surface of the conductor material layer 1 by using extrusion equipment to serve as an XLPE insulating layer 2;
s3, winding a copper flat belt outside the XLPE insulating layer 2 to serve as a metal shielding layer 3;
s4, extruding a layer of modified polytetrafluoroethylene on the periphery of the metal shielding layer 3 to serve as a wrapping lining layer 4;
s5, weaving a layer of glass fiber as a flame-retardant belting layer 5 on the periphery of the lapping inner liner layer 4;
s6, extruding a layer of modified polytetrafluoroethylene on the periphery of the flame-retardant belting layer 5 to serve as a flame-retardant outer sheath layer 6, and forming a final product.
The manufacturing method of the high-performance power cable comprises the following raw materials in percentage by mass: CuNi: 0.10 percent; and (3) CuV: 0.21 percent; and (3) CuNb: 0.67 percent; CuCr: 0.05 percent; CuLa: 2.00 percent; al: 0.04 percent; ag: 0.04 percent; cu: and (4) the balance.
The preparation method of the antioxidant high-stability multi-structure alloy wire comprises the following steps:
s1, alloy smelting: proportioning the raw materials according to the proportion, mixing the Cu, CuV, CuNi and CuCr intermediate alloy, heating to 1500 ℃ for smelting, and after the raw materials are fully molten, mixing the raw materials according to the mass ratio of 3: 1, adding a CuLa and CuNb intermediate alloy, heating to 1640 ℃, and fully smelting until the intermediate alloy is completely melted to obtain a smelting alloy liquid;
s2, continuous casting and rolling: controlling the casting temperature to 1610 ℃ and the drawing speed to 3.6m/min, and casting the smelted alloy liquid of S1 into an alloy rod; then, continuous rolling is carried out, the alloy wire is rolled by a rough rolling unit and a finishing rolling unit, a water cooling device is arranged in the process, the initial rolling temperature is controlled to be 1105 ℃, the finish rolling temperature is controlled to be 950 ℃, and meanwhile, the total reduction rate of finish rolling is ensured to be 50 percent, so that an alloy wire is obtained;
s3, surface treatment: and (2) pulling the alloy wire obtained in the S2 into a surface treatment furnace for surface pre-infiltration Al-Ag treatment, wherein the Al-Ag is an alloy liquid formed by mixing Al liquid and Ag liquid in a mass ratio of 1:1, and the alloy wire is immersed into the Al-Ag alloy liquid, and the treatment temperature is as follows: at 75 ℃, the treatment time is as follows: 25 min;
s4, pressure processing: drawing the alloy wire subjected to surface treatment in the step S3 into a wire drawing die, and drawing the alloy wire to obtain the alloy wire, wherein the wire drawing deformation rate is 65%, and the wire drawing temperature is 340 ℃;
s5, performance heat treatment: drawing the alloy wire processed under the pressure of S4 into a performance heat treatment combination furnace, and then entering an induction heat treatment tunnel furnace for 30min at 680 ℃; and then the alloy wire enters a quenching tank for rapid cooling, the cooling speed of the rapid cooling is 6 ℃/s, and then the antioxidant high-stability multi-structure alloy wire is obtained.
As shown in FIG. 2, Cu is formed on the surface of the oxidation-resistant highly stable multi-structural alloy wire9Al4Ag3A compact alloy layer, wherein a large amount of Cu is distributed at the internal crystal boundary of the oxidation-resistant high-stability multi-structure alloy wire13Nb7La5A metal compound.
The preparation method of the modified polytetrafluoroethylene comprises the following steps:
s1, preparing a tetrafluoroethylene monomer and a hexafluoropropylene monomer in a volume ratio of 4.5: 1.2, introducing the mixed gas phase into a polymerization kettle, continuously adding a tetrafluoroethylene monomer and a hexafluoropropylene monomer, wherein the adding flow rate of the tetrafluoroethylene monomer is 180mL/min, the adding time is 12min, adjusting the temperature in the polymerization kettle to 33 ℃, then adding 8g/L sodium metabisulfite, and starting to carry out polymerization reaction;
s2, continuously and continuously replenishing a gas-phase tetrafluoroethylene monomer, a gas-phase hexafluoropropylene monomer and a solid-phase magnesium carbonate whisker in the polymerization reaction process, wherein the flow rate of the replenished tetrafluoroethylene monomer is 60 mL/min; the flow rate of the supplemented hexafluoropropylene monomer is 100 mL/min; the supplemented solid-phase magnesium carbonate crystal whisker is 1.2mg/min, and the length of the crystal whisker is 10 nm; keeping the pressure of the polymerization reaction at 0.77MPa and the time of the polymerization reaction at 90min, diluting the dispersion obtained after polymerization with water to the concentration of 440g/L, adjusting the temperature to 25 ℃, mechanically stirring and coagulating, washing with water, and drying to obtain the modified polytetrafluoroethylene.
The lapping inner liner layer 5 and the flame-retardant outer sheath layer 6 are both mixed with nano magnesium carbonate whiskers in the modified polytetrafluoroethylene.
Use of a high performance power cable in a high speed railway cable and/or a submarine cable.
The high performance power cable prepared in this example was subjected to performance testing, and the results are shown in table 1 and table 2 below:
TABLE 1 Oxidation resistance parameters (1atm high purity oxygen, 550 deg.C, continuous oxidation for 24h)
Figure BDA0002752156350000071
TABLE 2 temperature fluctuation stability parameters for high performance power cables of the present invention
Figure BDA0002752156350000072
Example 2:
the utility model provides a high performance power cable, includes conductor material layer 1, XLPE insulating layer 2, metallic shield 3 that sets gradually from inside to outside, winds package inner liner 4, fire-retardant band layer 5 and fire-retardant oversheath layer 6.
The conductor material layer 1 is made of anti-oxidation high-stability multi-structure alloy wires through positive and negative twisting.
The wrapping inner liner layer 4 and the flame-retardant outer sheath layer 6 are both made of modified polytetrafluoroethylene.
Cu is formed on the surface of the antioxidant high-stability multi-structure alloy wire9Al4Ag3A compact alloy layer, wherein a large amount of Cu is distributed at the internal crystal boundary of the oxidation-resistant high-stability multi-structure alloy wire13Nb7La5A metal compound.
A method of manufacturing a high performance power cable comprising the steps of:
s1, adopting anti-oxidation high-stability multi-structure alloy wires to be twisted in the positive and negative directions to serve as a conductor material layer 1 of the power cable;
s2, drawing out crosslinked polyethylene on the surface of the conductor material layer 1 by using extrusion equipment to serve as an XLPE insulating layer 2;
s3, winding a copper flat belt outside the XLPE insulating layer 2 to serve as a metal shielding layer 3;
s4, extruding a layer of modified polytetrafluoroethylene on the periphery of the metal shielding layer 3 to serve as a wrapping lining layer 4;
s5, weaving a layer of glass fiber as a flame-retardant belting layer 5 on the periphery of the lapping inner liner layer 4;
s6, extruding a layer of modified polytetrafluoroethylene on the periphery of the flame-retardant belting layer 5 to serve as a flame-retardant outer sheath layer 6, and forming a final product.
The manufacturing method of the high-performance power cable comprises the following raw materials in percentage by mass: CuNi: 0.22 percent; and (3) CuV: 0.31 percent; and (3) CuNb: 1.22 percent; CuCr: 0.15 percent; CuLa: 3.66 percent; al: 0.08 percent; ag: 0.08 percent; cu: and (4) the balance.
The preparation method of the antioxidant high-stability multi-structure alloy wire comprises the following steps:
s1, alloy smelting: proportioning the raw materials according to the proportion, mixing the intermediate alloy of Cu, CuV, CuNi and CuCr, heating to 1580 ℃ for smelting, and after the intermediate alloy is fully molten, mixing the raw materials according to the mass ratio of 3: 1, adding a CuLa and CuNb intermediate alloy, heating to 1740 ℃ for full smelting until the CuLa and CuNb intermediate alloy is completely melted to obtain a smelting alloy liquid;
s2, continuous casting and rolling: controlling the casting temperature to be 1710 ℃, and the drawing speed to be 4.1m/min, and casting the smelted alloy liquid of S1 into an alloy rod; then, continuously rolling, namely, performing rough rolling and finish rolling by a finish rolling unit, arranging a water-through cooling device in the process, controlling the initial rolling temperature to be 1120 ℃, controlling the finish rolling temperature to be 980 ℃, and simultaneously ensuring that the total reduction rate of finish rolling is 60 percent to obtain an alloy wire;
s3, surface treatment: and (2) drawing the alloy wire obtained in the step (S2) into a surface treatment furnace for surface pre-infiltration Al-Ag treatment, wherein the Al-Ag is an alloy liquid formed by mixing Al liquid and Ag liquid in a mass ratio of 1:1, and the treatment temperature is as follows: the treatment time is as follows at 850 ℃: 35 min;
s4, pressure processing: drawing the alloy wire subjected to surface treatment in the step S3 into a wire drawing die, and drawing the alloy wire, wherein the wire drawing deformation rate is 85%, and the wire drawing temperature is 420 ℃, so as to obtain the alloy wire;
s5, performance heat treatment: drawing the alloy wire processed under the pressure of S4 into a performance heat treatment combination furnace, and then entering an induction heat treatment tunnel furnace at the temperature of 750 ℃ for 40 min; and then the alloy wire enters a quenching tank for rapid cooling, the cooling speed of the rapid cooling is 9 ℃/s, and then the antioxidant high-stability multi-structure alloy wire is obtained.
Cu is formed on the surface of the antioxidant high-stability multi-structure alloy wire9Al4Ag3A compact alloy layer, wherein a large amount of Cu is distributed at the internal crystal boundary of the oxidation-resistant high-stability multi-structure alloy wire13Nb7La5A metal compound.
The preparation method of the modified polytetrafluoroethylene comprises the following steps:
s1, preparing a tetrafluoroethylene monomer and a hexafluoropropylene monomer in a volume ratio of 4.5: 1.2, introducing the mixed gas phase into a polymerization kettle, continuously adding a tetrafluoroethylene monomer and a hexafluoropropylene monomer, wherein the adding flow rate of the tetrafluoroethylene monomer is 220mL/min, the adding time is 18min, adjusting the temperature in the polymerization kettle to 38 ℃, then adding 10g/L sodium metabisulfite, and starting to carry out polymerization reaction;
s2, continuously and continuously replenishing a gas-phase tetrafluoroethylene monomer, a gas-phase hexafluoropropylene monomer and a solid-phase magnesium carbonate whisker in the polymerization reaction process, wherein the flow rate of the replenished tetrafluoroethylene monomer is 70 mL/min; the flow rate of the supplemented hexafluoropropylene monomer is 108 mL/min; the supplemented solid-phase magnesium carbonate crystal whisker is 1.8mg/min, and the length of the crystal whisker is 30 nm; keeping the pressure of the polymerization reaction at 0.82MPa and the time of the polymerization reaction at 100min, diluting the dispersion obtained after polymerization with water to the concentration of 460g/L, adjusting the temperature to 35 ℃, mechanically stirring and coagulating, washing with water, and drying to obtain the modified polytetrafluoroethylene.
Use of a high performance power cable in a high speed railway cable and/or a submarine cable.
The high performance power cable prepared in this example was subjected to performance testing, and the results are shown in table 3 and table 4 below:
TABLE 3 Oxidation resistance parameters (1atm high purity oxygen, 550 ℃, continuous oxidation for 24h)
Figure BDA0002752156350000091
TABLE 4 temperature fluctuation stability parameters for high performance power cables of the present invention
Figure BDA0002752156350000092
Figure BDA0002752156350000101
Example 3:
this example differs from example 1 only in that:
the manufacturing method of the high-performance power cable comprises the following raw materials in percentage by mass: CuNi: 0.15 percent; and (3) CuV: 0.25 percent; and (3) CuNb: 0.73 percent; CuCr: 0.10 percent; CuLa: 3.66 percent; al: 0.05 percent; ag: 0.05 percent; cu: and (4) the balance.
A manufacturing method of a high-performance power cable comprises the following steps:
s1, alloy smelting: proportioning the raw materials according to the proportion, mixing the Cu, CuV, CuNi and CuCr intermediate alloy, heating to 1550 ℃ for smelting, and after the intermediate alloy is fully molten, mixing the raw materials according to the mass ratio of 5: 1, adding a CuLa and CuNb intermediate alloy, heating to 1700 ℃ for full smelting until the CuLa and CuNb intermediate alloy are completely melted to obtain a smelting alloy liquid;
s2, continuous casting and rolling: controlling the casting temperature to 1650 ℃ and the drawing speed to 3.8m/min, and casting the smelted alloy liquid of S1 into an alloy rod; then, continuously rolling, namely, rolling by a rough rolling unit and a finish rolling unit, arranging a water cooling device in the process, controlling the initial rolling temperature at 1110 ℃, controlling the finish rolling temperature at 965 ℃, and simultaneously ensuring that the total reduction rate of finish rolling is 55 percent to obtain an alloy wire;
s3, surface treatment: and (2) drawing the alloy wire obtained in the step (S2) into a surface treatment furnace for surface pre-infiltration Al-Ag treatment, wherein the Al-Ag is an alloy liquid formed by mixing Al liquid and Ag liquid in a mass ratio of 1:1, and the treatment temperature is as follows: the treatment time is as follows at 800 ℃: 30 min;
s4, pressure processing: drawing the alloy wire subjected to surface treatment in the step S3 into a wire drawing die, and drawing the alloy wire to obtain the alloy wire, wherein the wire drawing deformation rate is 75%, and the wire drawing temperature is 380 ℃;
s5, performance heat treatment: drawing the alloy wire processed under the pressure of S4 into a performance heat treatment combination furnace, and then entering an induction heat treatment tunnel furnace at the temperature of 710 ℃ for 35 min; and then the alloy wire enters a quenching tank for rapid cooling, the cooling speed of the rapid cooling is 8 ℃/s, and then the antioxidant high-stability multi-structure alloy wire is obtained.
The preparation method of the modified polytetrafluoroethylene comprises the following steps:
s1, preparing a tetrafluoroethylene monomer and a hexafluoropropylene monomer in a volume ratio of 4.5: introducing the mixed gas phase of 1.2 into a polymerization kettle, continuously adding a tetrafluoroethylene monomer and a hexafluoropropylene monomer, wherein the adding flow rate of the tetrafluoroethylene monomer is 200mL/min, the adding time is 15min, adjusting the temperature in the polymerization kettle to 35 ℃, then adding 9g/L sodium metabisulfite, and starting to carry out polymerization reaction;
s2, continuously and continuously replenishing a gas-phase tetrafluoroethylene monomer, a gas-phase hexafluoropropylene monomer and a solid-phase magnesium carbonate whisker in the polymerization reaction process, wherein the flow rate of the replenished tetrafluoroethylene monomer is 65 mL/min; the flow rate of the supplemented hexafluoropropylene monomer is 105 mL/min; the supplemented solid-phase magnesium carbonate crystal whisker is 1.5mg/min, and the length of the crystal whisker is 20 nm; keeping the pressure of the polymerization reaction at 0.80MPa and the time of the polymerization reaction at 95min, diluting the dispersion obtained after polymerization with water to the concentration of 450g/L, adjusting the temperature to 30 ℃, mechanically stirring and coagulating, washing with water, and drying to obtain the modified polytetrafluoroethylene.
Example 4:
this example differs from example 1 only in that:
the manufacturing method of the high-performance power cable comprises the following raw materials in percentage by mass: CuNi: 0.18 percent; and (3) CuV: 0.28 percent; and (3) CuNb: 0.40 percent; CuCr: 0.12 percent; CuLa: 2.00 percent; al: 0.06 percent; ag: 0.06 percent; cu: and (4) the balance. The mass ratio of the CuLa to the CuNb master alloy is 5: 1.
example 5:
this example differs from example 1 only in that:
the manufacturing method of the high-performance power cable comprises the following raw materials in percentage by mass: CuNi: 0.16 percent; and (3) CuV: 0.30 percent; and (3) CuNb: 0.70 percent; CuCr: 0.13 percent; CuLa: 2.80 percent; al: 0.07 percent; ag: 0.07 percent; cu: and (4) the balance. The mass ratio of the CuLa to the CuNb master alloy is 4: 1.
the foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. A high performance power cable characterized by: including the conductor material layer that sets gradually from inside to outside, XLPE insulating layer, metal shielding layer winds the package inner liner, fire-retardant band layer and fire-retardant oversheath layer.
2. A high performance power cable according to claim 1, characterized in that: the conductor material layer is made of anti-oxidation high-stability multi-structure alloy wires through positive and negative twisting.
3. A high performance power cable according to claim 1, characterized in that: the wrapping inner liner layer and the flame-retardant outer sheath layer are both made of modified polytetrafluoroethylene.
4. A high performance power cable according to claim 2, characterized in that: cu is formed on the surface of the antioxidant high-stability multi-structure alloy wire9Al4Ag3A compact alloy layer, wherein a large amount of Cu is distributed at the internal crystal boundary of the oxidation-resistant high-stability multi-structure alloy wire13Nb7La5A metal compound.
5. A manufacturing method of a high-performance power cable is characterized by comprising the following steps: the method comprises the following steps:
s1, adopting anti-oxidation high-stability multi-structure alloy wires to be twisted in the positive and negative directions to serve as a conductor material layer of a power cable;
s2, drawing out crosslinked polyethylene on the surface of the conductor material layer by using extrusion equipment to serve as an XLPE insulating layer;
s3, winding a copper flat belt outside the XLPE insulating layer to serve as a metal shielding layer;
s4, extruding a layer of modified polytetrafluoroethylene on the periphery of the metal shielding layer to serve as a wrapping inner liner layer;
s5, weaving a layer of glass fiber as a flame-retardant belting layer on the periphery of the lapping inner liner layer;
and S6, extruding a layer of modified polytetrafluoroethylene on the periphery of the flame-retardant wrapping tape layer to serve as a flame-retardant outer sheath layer, and forming a final product.
6. A method of manufacturing a high performance power cable according to claim 5, characterized in that: the antioxidant high-stability multi-structure alloy wire comprises the following raw materials in percentage by mass:
Figure FDA0002752156340000011
7. the method of claim 6, wherein the step of forming the high performance power cable comprises: the preparation method of the antioxidant high-stability multi-structure alloy wire comprises the following steps:
s1, alloy smelting: the preparation method comprises the following steps of proportioning the raw materials according to the proportion, heating the intermediate alloy of Cu, CuV, CuNi and CuCr to 1500-1580 ℃ for smelting, and after the intermediate alloy is fully molten, mixing the raw materials according to the mass ratio of (3-5): 1, adding a CuLa and CuNb intermediate alloy, heating to 1640-1740 ℃, and fully smelting until the intermediate alloy is completely molten to obtain a molten alloy liquid;
s2, continuous casting and rolling: controlling the casting temperature to be 1610-1710 ℃, and the drawing speed to be 3.6-4.1 m/min, and casting the molten alloy liquid of S1 into an alloy rod; then, continuously rolling, namely performing rough rolling and rolling by a finishing mill set, arranging a water-through cooling device in the process, controlling the initial rolling temperature to be 1105-1120 ℃, controlling the finish rolling temperature to be 950-980 ℃, and simultaneously ensuring that the total reduction rate of finish rolling is more than or equal to 50% to obtain an alloy wire;
s3, surface treatment: and (2) drawing the alloy wire obtained in the step (S2) into a surface treatment furnace for surface pre-infiltration Al-Ag treatment, wherein the Al-Ag is an alloy liquid formed by mixing Al liquid and Ag liquid in a mass ratio of 1:1, and the treatment temperature is as follows: and (3) treating at the temperature of 750-850 ℃ for: 25-35 min;
s4, pressure processing: drawing the alloy wire subjected to surface treatment in the step S3 into a wire drawing die, and drawing the alloy wire to obtain the alloy wire, wherein the wire drawing deformation rate is 65-85%, and the wire drawing temperature is 340-420 ℃;
s5, performance heat treatment: drawing the alloy wire processed under the pressure of S4 into a performance heat treatment combination furnace, and then, feeding the alloy wire into an induction heat treatment tunnel furnace for 30-40 min at 680-750 ℃; and then the alloy wire enters a quenching tank to be rapidly cooled to obtain the antioxidant high-stability multi-structure alloy wire.
8. A method of manufacturing a high performance power cable according to claim 7, characterized in that: cu is formed on the surface of the antioxidant high-stability multi-structure alloy wire9Al4Ag3A compact alloy layer, wherein a large amount of Cu is distributed at the internal crystal boundary of the oxidation-resistant high-stability multi-structure alloy wire13Nb7La5A metal compound.
9. A method of manufacturing a high performance power cable according to claim 5, characterized in that: the preparation method of the modified polytetrafluoroethylene comprises the following steps:
s1, preparing a tetrafluoroethylene monomer and a hexafluoropropylene monomer in a volume ratio of 4.5: introducing the mixed gas phase of 1.2 into a polymerization kettle, continuously adding a tetrafluoroethylene monomer and a hexafluoropropylene monomer, wherein the adding flow rate of the tetrafluoroethylene monomer is 180-220 mL/min, the adding time is 12-18 min, adjusting the temperature in the polymerization kettle to 33-38 ℃, then adding 8-10 g/L sodium metabisulfite, and starting to carry out polymerization reaction;
s2, continuously and continuously replenishing a gas-phase tetrafluoroethylene monomer, a gas-phase hexafluoropropylene monomer and a solid-phase magnesium carbonate whisker in the polymerization reaction process, wherein the flow rate of the replenished tetrafluoroethylene monomer is 60-70 mL/min; the flow rate of the supplemented hexafluoropropylene monomer is 100-108 mL/min; the supplemented solid-phase magnesium carbonate crystal whisker is 1.2-1.8 mg/min, and the length of the crystal whisker is 10-30 nm; keeping the pressure of the polymerization reaction at 0.77-0.82 MPa, keeping the time of the polymerization reaction at 90-100 min, diluting the obtained dispersion after polymerization with water to the concentration of 440-460 g/L, adjusting the temperature to 25-35 ℃, mechanically stirring for coagulation, washing with water, and drying to obtain the modified polytetrafluoroethylene.
10. Use of a high performance power cable according to claim 1 in high speed railway cables and/or submarine cables.
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201956114U (en) * 2011-03-15 2011-08-31 江苏赛德电气有限公司 Irradiated cross-linked polyolefin insulated flame-retardant power cable with enhanced sheath
RU158299U1 (en) * 2015-07-20 2015-12-27 Общество с ограниченной ответственностью "Кабель Технологии Инновации" THREE-PHASE POWER CABLE WITH A GENERAL METAL SCREEN
CN106251969A (en) * 2016-10-17 2016-12-21 昆山翰辉电子科技有限公司 A kind of flame-proof power cable
CN205984393U (en) * 2016-07-19 2017-02-22 江苏赛特电气有限公司 Power cable for track traffic
CN107586980A (en) * 2017-09-30 2018-01-16 中天合金技术有限公司 A kind of multielement rare earth alloying high-conductivity copper alloy and preparation method thereof
CN111261317A (en) * 2020-04-09 2020-06-09 江东合金技术有限公司 High-performance antioxidant copper conductor material for special cable and preparation method thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201956114U (en) * 2011-03-15 2011-08-31 江苏赛德电气有限公司 Irradiated cross-linked polyolefin insulated flame-retardant power cable with enhanced sheath
RU158299U1 (en) * 2015-07-20 2015-12-27 Общество с ограниченной ответственностью "Кабель Технологии Инновации" THREE-PHASE POWER CABLE WITH A GENERAL METAL SCREEN
CN205984393U (en) * 2016-07-19 2017-02-22 江苏赛特电气有限公司 Power cable for track traffic
CN106251969A (en) * 2016-10-17 2016-12-21 昆山翰辉电子科技有限公司 A kind of flame-proof power cable
CN107586980A (en) * 2017-09-30 2018-01-16 中天合金技术有限公司 A kind of multielement rare earth alloying high-conductivity copper alloy and preparation method thereof
CN111261317A (en) * 2020-04-09 2020-06-09 江东合金技术有限公司 High-performance antioxidant copper conductor material for special cable and preparation method thereof

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