Aluminum alloy conductor and preparation method thereof

Abstract

The invention relates to an aluminum alloy conductor and a preparation method thereof. The aluminum alloy conductor comprises the following chemical components in percentage by mass: 0.008% to 0.03% of Y, 0.001% to 0.01% of B, 0.001% to 0.01% of La, 0.001% to 0.01% of Ce, 0.0018% to 0.025% of Zr, 0.05% to 0.12% of Fe, 0.01% to 0.03% of Si, 99.715% to 99.9272% of Al and 0 to 0.05% of other elements. According to the aluminum alloy conductor, Y, B, La, Ce, Zr, Fe, Si and other chemical components are added into the Al matrix according to a specific proportion, and meanwhile the conductivity, mechanical strength and heat resistance of the conductor are considered.

Description

Technical Field

[0001] The invention relates to the technical field of metal materials, and in particular to an aluminum alloy wire and a preparation method thereof. Background Art

[0002] As the demand for electricity increases, overhead wires need to have higher transmission capacity. The increase in the transmission capacity of overhead wires means that the operating temperature and conductivity of the lines must also be increased. However, the conductivity, mechanical strength and heat resistance of wire materials are mutually restricted, so it is extremely important to determine the balance between the three for wires. This is also the contradiction and problem that needs to be solved in the process of wire material research and development. Summary of the invention

[0003] Based on this, it is necessary to provide a high-conductivity, high-strength and heat-resistant aluminum alloy wire and a preparation method thereof.

[0004] One of the purposes of the present invention is to provide an aluminum alloy conductor, the scheme is as follows:

[0005] An aluminum alloy wire comprises the following chemical components in percentage by mass:

[0006] Y 0.008%~0.03%,

[0007] B 0.001%~0.01%,

[0008] La 0.001%~0.01%,

[0009] Ce 0.001%~0.01%,

[0010] Zr 0.0018%~0.025%,

[0011] Fe 0.05%~0.12%,

[0012] Si 0.01%~0.03%,

[0013] Al 99.715%~99.9272%, and

[0014] Other elements 0~0.05%.

[0015] In one embodiment, the aluminum alloy wire comprises the following chemical components in mass percentage:

[0016] Y 0.02%~0.03%,

[0017] B 0.001%~0.01%,

[0018] La 0.001%~0.01%,

[0019] Ce 0.001%~0.01%,

[0020] Zr 0.005%~0.025%,

[0021] Fe 0.05%~0.12%,

[0022] Si 0.01%~0.03%,

[0023] Al 99.715%~99.912%, and

[0024] Other elements 0~0.05%.

[0025] In one embodiment, the aluminum alloy conductor is a multi-layer twisted conductor.

[0026] In one embodiment, the aluminum alloy wire has an inner layer pitch ratio of 11-15, and an outer layer pitch ratio of 10.5-11.5.

[0027] In one embodiment, the electrical conductivity of the aluminum alloy wire is 61.5% IACS-62.5% IACS.

[0028] In one embodiment, the tensile strength of the aluminum alloy wire is 175 MPa~182 MPa.

[0029] In one embodiment, the maximum continuous operating temperature of the aluminum alloy wire is 210°C to 230°C.

[0030] Another object of the present invention is to provide a method for preparing the aluminum alloy wire described in any of the above embodiments, the method being as follows:

[0031] A method for preparing the aluminum alloy wire comprises the following steps:

[0032] Melting and mixing aluminum metal, Al-Fe alloy and Al-Zr alloy to obtain a first aluminum alloy liquid;

[0033] Adding rare earth raw materials, Al-B alloy, and Al-Si alloy to the first aluminum alloy liquid, mixing, and obtaining a second aluminum alloy liquid;

[0034] forming the second aluminum alloy liquid into an aluminum alloy wire;

[0035] The aluminum alloy wire is heat-treated to obtain a heat-treated wire.

[0036] In one embodiment, forming the second aluminum alloy liquid into an aluminum alloy wire comprises:

[0037] The second aluminum alloy liquid is subjected to a rolling process, and the second aluminum alloy liquid is continuously cast and rolled into an aluminum alloy round rod;

[0038] The aluminum alloy round rod is subjected to a drawing process to obtain the aluminum alloy wire.

[0039] In one embodiment, before the rolling process, the first aluminum alloy liquid is subjected to furnace refining, degassing, decontamination and slag removal.

[0040] In one of the embodiments, before the rolling process, the second aluminum alloy liquid is filtered by passing through an electromagnetic purification box and a ceramic filter plate in sequence.

[0041] In one embodiment, the heat treatment temperature is 160-170° C. and the time is 12-24 hours.

[0042] In one embodiment, the preparation method further includes the following step: twisting the heat-treated wires.

[0043] In one embodiment, the twisting tension of the twisting process is controlled at 185~215N.

[0044] In one of the embodiments, in the twisting process, the inner layer pitch ratio of the aluminum alloy wire is controlled to be 11-15, and the outer layer pitch ratio is controlled to be 10.5-11.5.

[0045] Compared with the traditional solution, the above aluminum alloy wire and its preparation method have the following beneficial effects:

[0046] The above-mentioned aluminum alloy wire adds specific proportions of chemical components such as Y, B, La, Ce, Zr, Fe, Si, etc. to the Al matrix, while taking into account the conductivity, mechanical strength and heat resistance of the wire.

[0047] Among them, the Zr element is dissolved in the matrix and has little effect on the crystal structure of the Al matrix, so it is beneficial to improve the conductivity. At the same time, the Zr element has heat resistance and can effectively improve the heat resistance of the alloy. In addition, as Zr pins the grain boundary, it can play a certain strengthening role.

[0048] Among them, there is a synergistic effect between Y and Zr, which is mainly reflected in the segregation of Zr and Y elements, pinning the grain boundaries to strengthen the matrix. B element reacts with the impurity V element to reduce the content of V element and improve the conductivity. Rare earth elements such as La and Ce refine the structure, improve the two performance indicators of tensile strength and elongation, and can also play a role in purifying the melt. DETAILED DESCRIPTION

[0049] In order to facilitate the understanding of the present invention, the present invention will be described more fully below. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. The purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0050] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0051] In the description of the present invention, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number or order of the indicated technical features.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0053] The aluminum alloy wire according to one embodiment of the present invention comprises the following chemical components in percentage by mass:

[0054] Y 0.008%~0.03%,

[0055] B 0.001%~0.01%,

[0056] La 0.001%~0.01%,

[0057] Ce 0.001%~0.01%,

[0058] Zr 0.0018%~0.025%,

[0059] Fe 0.05%~0.12%,

[0060] Si 0.01%~0.03%,

[0061] Al 99.715%~99.9272%, and

[0062] Other elements 0~0.05%.

[0063] The other elements are, for example, impurities that are inevitably introduced from raw materials, process, etc. The mass percentage of the other elements is preferably less than 0.05%, more preferably less than 0.04%, more preferably less than 0.03%, more preferably less than 0.02%, and more preferably less than 0.01%. It can be understood that the content of the other elements can also be 0.

[0064] The above-mentioned aluminum alloy wire adds specific proportions of chemical components such as Y, B, La, Ce, Zr, Fe, Si, etc. to the Al matrix, while taking into account the conductivity, mechanical strength and heat resistance of the wire.

[0065] Among them, the Zr element is dissolved in the matrix and has little effect on the crystal structure of the Al matrix, so it is beneficial to improve the conductivity. At the same time, the Zr element has heat resistance and can effectively improve the heat resistance of the alloy. In addition, as Zr pins the grain boundary, it can play a certain strengthening role.

[0066] Among them, there is a synergistic effect between Y and Zr, which is mainly reflected in the segregation of Zr and Y elements, pinning the grain boundaries to strengthen the matrix. B element reacts with the impurity V element to reduce the content of V element and improve the conductivity. Rare earth elements such as La and Ce refine the structure, improve the two performance indicators of tensile strength and elongation, and can also play a role in purifying the melt.

[0067] In some of these examples, the aluminum alloy wire includes the following chemical compositions in mass percentage:

[0068] Y 0.02%~0.03%,

[0069] B 0.001%~0.01%,

[0070] La 0.001%~0.01%,

[0071] Ce 0.001%~0.01%,

[0072] Zr 0.005%~0.025% 、

[0073] Fe 0.05%~0.12%,

[0074] Si 0.01%~0.03%,

[0075] Al 99.715%~99.912%, and

[0076] Other elements 0~0.05%.

[0077] In some examples, the aluminum alloy wire is a multi-layer stranded wire. Further, the inner layer pitch ratio of the aluminum alloy wire is 11-15, specifically 11, 12, 13, 14, 15, etc. The outer layer pitch ratio of the aluminum alloy wire is 10.5-11.5, specifically 10.5, 10.7, 10.9, 11.1, 11.3, 11.5, etc.

[0078] In some of the examples, the conductivity of the aluminum alloy wire is 61.5% IACS~62.5% IACS, for example, 61.5% IACS, 61.6% IACS, 61.7% IACS, 61.8% IACS, 61.9% IACS, 62.0% IACS, 62.1% IACS, 62.2% IACS, 62.3% IACS, 62.4% IACS, 62.5% IACS, etc.

[0079] In some of the examples, the tensile strength of the aluminum alloy wire is 175 MPa to 182 MPa, for example, 175 MPa, 176 MPa, 177 MPa, 178 MPa, 179 MPa, 180 MPa, 181 MPa, 182 MPa, etc.

[0080] In one embodiment, the maximum continuous operating temperature of the aluminum alloy wire is 210°C-230°C, for example, 210°C, 212°C, 214°C, 216°C, 218°C, 220°C, 222°C, 224°C, 226°C, 228°C, 230°C, etc.

[0081] The material optimization method of the aluminum alloy conductor provided by the present invention comprises the following steps:

[0082] Step S1, preliminarily determining the alloying elements, added rare earth elements and their addition ranges in the aluminum alloy.

[0083] Specifically, the influence of microalloying elements and characteristic microstructures on the electrical and mechanical properties of high-strength aluminum alloy conductor materials is studied in combination with the element binary phase diagram, the mechanism of interaction of rare earth microalloying elements and the influence mechanism of aluminum alloy precipitation behavior are explored, and the influence of the existence state of alloying elements on the conductivity and strength of electrical aluminum alloys is revealed.

[0084] By combining relevant analysis and research with actual production experience, the addition ranges of elements such as Zr, Y, Ce, and La were preliminarily determined: Zr: 0.002%~0.4%, Y: 0.01%~0.04%, Ce: 0.001%~0.01%, La: 0.001%~0.01%.

[0085] Step S2: studying the optimal contents of alloying elements and rare earth elements in the aluminum alloy through simulation.

[0086] Specifically, simulation software is used to combine material performance measurement and computational simulation, optimize the composition of the initially selected alloying elements, design the matching of aluminum alloy performance and composition formula, and use a variety of methods and means to achieve the optimization design of composition and organization. The commonly used physical properties of aluminum alloys under different element additions are simulated by simulation software, and the performance of each element within the initial addition range is analyzed, including density-temperature curve, resistivity-temperature curve, cooling curve, etc. The yield strength, tensile strength and hardness are calculated, and the optimal content of trace elements in aluminum-zirconium alloys is studied.

[0087] Among them, the phase composition of the material at different temperatures is calculated as shown in formula (1-1).

[0088] (1-1)

[0089] In formula (1-1), G is the Gibbs free energy of the material system; x i is the content of i phase in the material system; is the Gibbs free energy of single phase i; R is the ideal gas constant; T is the temperature; x j is the content of phase j; is the interaction parameter between phases i and j; v is the number of phases in the system; the first term on the right side of the equal sign is the sum of the free energies of all pure phases in the system, the second term is the Gibbs free energy caused by the ideal mixing entropy of the system, and the third term is the free energy caused by the interaction between each phase in the system.

[0090] Then, the relevant properties of each phase at different temperatures are calculated based on the alloy composition of that phase.

[0091] Calculation of yield strength: The yield strength calculation takes into account solid solution strengthening and intermetallic phase precipitation strengthening.

[0092] Among them, the solid solution strengthening calculation of Al phase is shown in formula (1-2).

[0093] (1-2)

[0094] In formula (1-2), σ0 is the yield strength of single crystal Al alloy, k dem is an empirical constant and λ is the dendrite spacing.

[0095] Among them, the solid solution strengthening calculation of the eutectic phase is shown in formula (1-3).

[0096] (1-3)

[0097] In formula (1-3), σ Al is the Al solid solution yield strength, σ Meis the yield strength of the intermetallic compound, f Al 、f Me Represent the proportion of Al solid solution and intermetallic compound, f eut Represents the fraction of eutectic phase in the alloy.

[0098] Among them, the calculation of intermetallic precipitation hardening is shown in formula (1-4).

[0099] (1-4)

[0100] In formula (1-4), M is the Taylor factor, which is generally taken as 3, G is the shear modulus, b is the Burgers vector, L is the distance between particles, and r is the radius of the particle.

[0101] The total yield strength calculation is shown in formula (1-5).

[0102] (1-5)

[0103] In formula (1-5), f p and f i They represent the fractions of each component phase in the Al solid solution and the eutectic phase respectively.

[0104] Furthermore, other mechanical properties are calculated based on the yield strength.

[0105] For example, the stress-strain transformation calculation in the plastic deformation area is shown in formula (1-6).

[0106] (1-6)

[0107] In formula (1-6), B is an empirical constant and m is the work hardening number.

[0108] For example, the conversion calculation between tensile strength and yield strength is shown in formula (1-7).

[0109] (1-7)

[0110] In formula (1-7), m is the work hardening number.

[0111] For example, the conversion calculation of hardness and yield strength is shown in formula (1-8).

[0112] (1-8)

[0113] In formula (1-8), C is an empirical constant and m is the work hardening number.

[0114] Step S3: determine the conductor composition according to the simulation results and product technical requirements.

[0115] The simulation results were sorted and analyzed, and the electrical conductivity and tensile strength of each group of aluminum alloys were optimized as characteristic index values. Based on the product technical requirements, the element addition amount was finally confirmed based on the mechanical properties and electrical properties of the aluminum alloy. The result was that the following chemical compositions were added in mass percentage on the basis of the Al matrix: Y0.008%-0.03%, B0.001%-0.01%, La0.001%-0.01%, Ce0.001%-0.01%, Zr0.0018%-0.0025%, Fe0.05%-0.12%, and Si0.01%-0.03%.

[0116] Through the above research methods, the efficiency of material research and development can be improved, the cost of research and experimental materials and time costs can be reduced, and the beneficial effects are obvious.

[0117] Furthermore, the present invention also provides a method for preparing the aluminum alloy wire of any of the above examples.

[0118] A method for preparing an aluminum alloy wire in one embodiment comprises the following steps:

[0119] Step S110, aluminum metal, Al-Fe alloy and Al-Zr alloy are melted and mixed to obtain a first aluminum alloy liquid.

[0120] Step S120, adding rare earth raw materials, Al-B alloy, and Al-Si alloy into the first aluminum alloy liquid, and mixing them evenly to obtain a second aluminum alloy liquid.

[0121] Step S130, shaping the second aluminum alloy liquid into an aluminum alloy wire.

[0122] Step S140, heat-treating the aluminum alloy wire to obtain a heat-treated wire.

[0123] In the above preparation method, each raw material is prepared according to the above chemical composition and its content.

[0124] In some of the examples, in step S110, the melting temperature is, for example, 750°C-770°C, specifically, 750°C, 755°C, 760°C, 765°C, 770°C, etc.

[0125] In some of the examples, in step S110, the mass ratio of the Al-Fe alloy added is, for example, 0.1% to 0.15%, and specifically, for example, 0.1%, 0.11%, 0.12%, 0.13%, 0.14%, 0.15%, etc.

[0126] In some of the examples, in step S110, the mass ratio of the Al-Zr alloy added is, for example, 0.01% to 0.03%, and specifically, for example, 0.01%, 0.015%, 0.02%, 0.025%, 0.03%, etc.

[0127] In step S120, the rare earth raw material includes, for example, Al-Y, Al-Ce, Al-La, etc.

[0128] In some of the examples, in step S120, the added mass ratio of the rare earth raw material is, for example, 0.02% to 0.05%, and specifically, for example, 0.02%, 0.03%, 0.04%, 0.05%, etc.

[0129] In some examples, the step of forming the second aluminum alloy liquid into an aluminum alloy wire (step S130) includes:

[0130] The second aluminum alloy liquid is subjected to rolling treatment, and the second aluminum alloy liquid is continuously cast and rolled into an aluminum alloy round rod;

[0131] The aluminum alloy round rod is subjected to a drawing process to obtain an aluminum alloy wire.

[0132] In some of the examples, a crystallization wheel is used for rolling. The rotation speed of the crystallization wheel is adjusted according to the crystallization effect to facilitate the solidification of the aluminum liquid and meet the supercooling requirement. For example, in some of the examples, the rotation speed of the crystallization wheel is 10m / min~15m / min, specifically 10m / min, 11m / min, 12m / min, 13m / min, 14m / min, 15m / min, etc.

[0133] In the rolling process, the casting temperature is related to the composition of the alloy and its solidification rate. Too high a temperature is not conducive to the quality of solidification crystallization, and too low a temperature is poor in the crystallization effect. For example, in some of the examples, the casting temperature is 690°C to 700°C, specifically 690°C, 692°C, 694°C, 696°C, 698°C, 700°C, etc.

[0134] In the rolling process, the rolling temperature is selected at the optimal deformation temperature of the alloy, which is conducive to microstructure refinement, low deformation resistance, and conducive to casting deformation. For example, in some examples, the rolling temperature is 548°C to 555°C, specifically 548°C, 549°C, 550°C, 551°C, 552°C, 553°C, 554°C, 555°C, etc.

[0135] In the rolling process, the control of the cooling water flow rate is the control of the cooling rate. The appropriate cooling water flow rate is conducive to the change of the structure during the rolling process, from the coarse cast structure to the fine and uniform deformed grains. For example, in some of the examples, the cooling water flow rate is controlled to be 145L / min~150L / min, specifically 145L / min, 146L / min, 147L / min, 148L / min, 149L / min, 150L / min, etc.

[0136] In some of the examples, during the rolling process, the diameter of the aluminum alloy round rod obtained is 9 mm to 10 mm, for example, 9 mm, 9.2 mm, 9.5 mm, 9.6 mm, 9.8 mm, 10 mm, etc.

[0137] In the drawing process, the deformation amount of the drawing pass is determined according to the deformation resistance and structure of the alloy. For example, in some examples, the deformation amount is 1% to 4%, specifically 1%, 2%, 3%, 4%, etc.

[0138] In the drawing process, the drawing speed is related to the equipment capacity and the single wire strength, and the drawing speed that satisfies the alloy is selected. For example, in some examples, the drawing speed is 3m / s to 7m / s, specifically 3m / s, 4m / s, 5m / s, 6m / s, 7m / s, etc.

[0139] In some of the examples, in the drawing process, the diameter of the obtained aluminum alloy wire is 1 mm to 5 mm, for example, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, etc.

[0140] In some of the examples, before the rolling process, the first aluminum alloy liquid is subjected to furnace refining, degassing, impurity removal and slag removal.

[0141] In some of the examples, before the rolling process, the second aluminum alloy liquid is filtered by passing through an electromagnetic purification box and a ceramic filter plate in sequence.

[0142] In some examples, in step S140, the heat treatment temperature is 160° C. to 170° C., specifically 160° C., 162° C., 164° C., 166° C., 168° C., and 170° C. Within the above temperature range, it is beneficial for the elements to fully diffuse with each other and balance the properties of the alloy.

[0143] In some examples, in step S140, the heat treatment time is 12 hours to 24 hours, specifically 12 hours, 14 hours, 16 hours, 18 hours, 20 hours, 22 hours, 24 hours, etc. Within the above heat treatment time range, it is beneficial to fully diffuse the elements and balance the properties of the alloy.

[0144] In some of the examples, the method for preparing the aluminum alloy wire further includes the following steps:

[0145] Step S150, twisting the heat-treated wires to obtain aluminum alloy wires.

[0146] In some examples, in step S150, the twisting tension of the twisting process is controlled within 185N-215N, specifically 185N, 190N, 195N, 200N, 205N, 210N, etc. The twisting tension is controlled within the above range to ensure that there is no indentation during twisting and to ensure the best twisting quality of the wire.

[0147] In some examples, in step S150, the inner layer pitch ratio of the aluminum alloy wire is controlled to be 11-15, specifically, for example, 11, 12, 13, 14, 15, etc. The outer layer pitch ratio is controlled to be 10.5-11.5, specifically, for example, 10.5, 10.7, 10.9, 11.1, 11.3, 11.5, etc. When the inner and outer layer pitch ratios are controlled within the above range, better twisting quality can be obtained.

[0148] The following specific examples are provided to further illustrate the present invention. The present invention provides the following specific examples for a better understanding of the present invention, but is not limited to the specific implementation methods and does not limit the protection scope of the present invention.

[0149] Example 1

[0150] This embodiment provides an aluminum alloy wire and a method for preparing the same.

[0151] The aluminum alloy wire of this embodiment includes the following chemical components in percentage by mass:

[0152] Y 0.02%,

[0153] B 0.003%,

[0154] La 0.006%,

[0155] Ce 0.006%,

[0156] Zr 0.0048%,

[0157] Fe 0.05%,

[0158] Si 0.026%,

[0159] The mass percentage of Al in the aluminum alloy wire is 99.8002%, and the mass percentage of impurities is about 0.03%.

[0160] The method for preparing the aluminum alloy wire of this embodiment comprises the following steps:

[0161] Step 1: Take an industrial pure aluminum ingot, heat it to melt at 738° C., add an Al-Fe alloy ingot and an Al-Zr alloy ingot, mix them, and obtain a first aluminum alloy liquid.

[0162] Step 2, subjecting the first aluminum alloy liquid to in-furnace refining, degassing, de-impurity treatment and slag removal treatment.

[0163] Step 3, adding rare earth raw materials, Al-B alloy, and Al-Si alloy to the first aluminum alloy liquid, and mixing them evenly to obtain a second aluminum alloy liquid.

[0164] Step 4: The second aluminum alloy liquid is filtered by passing through an electromagnetic purification box and a ceramic filter plate with a porosity of 30 ppi in sequence.

[0165] Step 5, the second aluminum alloy liquid is rolled using a crystallization wheel, and the second aluminum alloy liquid is continuously cast and rolled into an aluminum alloy round rod. The rotation line speed of the crystallization wheel is 13.5m / min. The casting temperature is 699°C. The rolling temperature is 552°C. The flow rate of the cooling water is controlled to be 150L / min. The diameter of the obtained aluminum alloy round rod is 9.5mm.

[0166] Step 6: The aluminum alloy round rod is subjected to a drawing process to obtain an aluminum alloy wire. In the drawing process, the deformation amount is 3%. The drawing speed is 5 m / s. The diameter of the obtained aluminum alloy wire is 3 mm.

[0167] Step 7, heat-treating the aluminum alloy wire to obtain a heat-treated wire. The heat-treating temperature is 170° C. and the time is 12 hours.

[0168] Step 8, after cooling the heat-treated wire, twist the wire to obtain an aluminum alloy wire. The twisting tension of the twisting process is controlled at 210 N. The inner layer pitch ratio of the aluminum alloy wire is controlled at 13, and the outer layer pitch ratio is controlled at 11.

[0169] Example 2

[0170] This embodiment provides an aluminum alloy wire and a method for preparing the same.

[0171] The aluminum alloy wire of this embodiment includes the following chemical components in percentage by mass:

[0172] Y 0.024%,

[0173] B 0.01%,

[0174] La 0.003%,

[0175] Ce 0.003%,

[0176] Zr 0.02%,

[0177] Fe 0.1%,

[0178] Si 0.015%,

[0179] The mass percentage of Al in the aluminum alloy wire is 99.771%, and the mass percentage of impurities is about 0.05%.

[0180] The preparation method of the aluminum alloy wire of this embodiment is the same as that of embodiment 1.

[0181] Example 3

[0182] This embodiment provides an aluminum alloy wire and a method for preparing the same.

[0183] The aluminum alloy wire of this embodiment includes the following chemical components in percentage by mass:

[0184] Y 0.03%,

[0185] B 0.007%,

[0186] La 0.01%,

[0187] Ce 0.003%,

[0188] Zr 0.01%,

[0189] Fe 0.08%,

[0190] Si 0.01%,

[0191] The mass percentage of Al in the aluminum alloy wire is 99.81%, and the mass percentage of impurities is about 0.04%.

[0192] The preparation method of the aluminum alloy wire of this embodiment is the same as that of embodiment 1.

[0193] Example 4

[0194] This embodiment provides an aluminum alloy wire and a method for preparing the same.

[0195] The aluminum alloy wire of this embodiment includes the following chemical components in percentage by mass:

[0196] Y 0.027%,

[0197] B 0.005%,

[0198] La 0.004%,

[0199] Ce 0.001%,

[0200] Zr 0.005%,

[0201] Fe 0.12%,

[0202] Si 0.027%,

[0203] The mass percentage of Al in the aluminum alloy wire is 99.781%, and the mass percentage of impurities is about 0.03%.

[0204] The preparation method of the aluminum alloy wire of this embodiment is the same as that of embodiment 1.

[0205] Example 5

[0206] This embodiment provides an aluminum alloy wire and a method for preparing the same.

[0207] The aluminum alloy wire of this embodiment includes the following chemical components in percentage by mass:

[0208] Y 0.026%,

[0209] B 0.001,

[0210] La 0.001%,

[0211] Ce 0.01%,

[0212] Zr 0.025% 、

[0213] Fe 0.076%,

[0214] Si 0.03%,

[0215] The mass percentage of Al in the aluminum alloy wire is 99.801%, and the mass percentage of impurities is about 0.03%.

[0216] The preparation method of the aluminum alloy wire of this embodiment is the same as that of embodiment 1.

[0217] Comparative Example 1

[0218] The aluminum alloy wire of this comparative example includes the following chemical components in mass percentage:

[0219] Y 0.04%,

[0220] La 0.023%,

[0221] Ce 0.014%,

[0222] Zr 0.027%,

[0223] Fe 0.16%,

[0224] Si 0.033%,

[0225] The mass percentage of Al in the aluminum alloy wire is 99.643%, and the mass percentage of impurities is approximately 0.06%.

[0226] The preparation method of the aluminum alloy wire in this comparative example is the same as that in Example 1.

[0227] Comparative Example 2

[0228] The aluminum alloy wire of this comparative example includes the following chemical components in mass percentage:

[0229] Y 0.005%,

[0230] B 0.007%,

[0231] La 0.0006%,

[0232] Ce 0.007%,

[0233] Zr 0.026%,

[0234] Fe 0.27%,

[0235] Si 0.035%,

[0236] The mass percentage of Al in the aluminum alloy wire is 99.7924%, and the mass percentage of impurities is approximately 0.1%.

[0237] The preparation method of the aluminum alloy wire in this comparative example is the same as that in Example 1.

[0238] Comparative Example 3

[0239] The aluminum alloy wire of this comparative example includes the following chemical components in mass percentage:

[0240] Y 0.09%,

[0241] B 0.001%,

[0242] La 0.001%,

[0243] Ce 0.005%,

[0244] Zr 0.0019%,

[0245] Si 0.024%,

[0246] The mass percentage of Al in the aluminum alloy wire is 99.8071%, and the mass percentage of impurities is about 0.07%.

[0247] The preparation method of the aluminum alloy wire in this comparative example is the same as that in Example 1.

[0248] The aluminum alloy wires of Examples 1 to 5 and Comparative Examples 1 to 3 were subjected to performance tests, including electrical conductivity, tensile strength, and maximum continuous operating temperature. The test results are shown in Table 1.

[0249] Table 1

[0250]

[0251] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0252] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An aluminum alloy wire, characterized in that: The chemical composition includes the following mass percentages: Y 0.008%~0.03%、 B 0.001%~0.01%、 La 0.001%~0.01%, Ce 0.001%~0.01%, Zr 0.0018%~0.025%、 Fe 0.05%~0.12%, Si 0.01%~0.03%, Al 99.715%~99.9272%, and Other elements 0~0.05%.

2. The aluminum alloy wire according to claim 1, characterized in that: The aluminum alloy wire comprises the following chemical components in mass percentage: Y 0.02%~0.03%、 B 0.001%~0.01%、 La 0.001%~0.01%, Ce 0.001%~0.01%, Zr 0.005%~0.025%、 Fe 0.05%~0.12%, Si 0.01%~0.03%, Al 99.715%~99.912%, and Other elements 0~0.05%.

3. The aluminum alloy wire according to claim 1, characterized in that: The aluminum alloy conductor is a multi-layer twisted conductor.

4. The aluminum alloy wire according to claim 3, characterized in that: The inner layer pitch-to-diameter ratio of the aluminum alloy wire is 11-15, and the outer layer pitch-to-diameter ratio is 10.5-11.

5.

5. The aluminum alloy wire according to any one of claims 1 to 4, characterized in that: The electrical conductivity of the aluminum alloy wire is 61.5% IACS to 62.5% IACS; and / or The tensile strength of the aluminum alloy wire is 175MPa-182MPa; and / or The maximum continuous operating temperature of the aluminum alloy wire is 210°C to 230°C.

6. A method for preparing the aluminum alloy wire according to any one of claims 1 to 5, characterized in that: The following steps are involved: Melting and mixing aluminum metal, Al-Fe alloy and Al-Zr alloy to obtain a first aluminum alloy liquid; Adding rare earth raw materials, Al-B alloy, and Al-Si alloy to the first aluminum alloy liquid, mixing, and obtaining a second aluminum alloy liquid; forming the second aluminum alloy liquid into an aluminum alloy wire; The aluminum alloy wire is heat-treated to obtain a heat-treated wire.

7. The preparation method according to claim 6, characterized in that: The step of forming the second aluminum alloy liquid into an aluminum alloy wire comprises: The second aluminum alloy liquid is subjected to a rolling process, and the second aluminum alloy liquid is continuously cast and rolled into an aluminum alloy round rod; The aluminum alloy round rod is subjected to a drawing process to obtain the aluminum alloy wire.

8. The preparation method according to claim 7, characterized in that: Before the rolling process, the first aluminum alloy liquid is subjected to furnace refining, degassing, impurity removal and slag removal; and / or Before the rolling process, the second aluminum alloy liquid is filtered by passing through an electromagnetic purification box and a ceramic filter plate in sequence.

9. The preparation method according to any one of claims 6 to 8, characterized in that The heat treatment temperature is 160-170° C. and the time is 12-24 hours.

10. The preparation method according to any one of claims 6 to 8, characterized in that The preparation method further comprises the following steps: The heat-treated wires are subjected to twisting treatment; The twisting tension of the twisting process is controlled at 185-215N; and / or In the twisting process, the inner layer pitch ratio of the aluminum alloy wire is controlled to be 11-15, and the outer layer pitch ratio is controlled to be 10.5-11.5.

Images