A copper-iron alloy material with high saturation magnetization, its preparation method and application

Abstract

This invention discloses a high-saturation magnetization copper-iron alloy material, its preparation method, and its applications, belonging to the field of copper-iron alloy technology. The high-saturation magnetization copper-iron alloy material has an Fe content of 15-30 wt.%, with the balance being Cu and unavoidable impurities. The preparation method employs a composite processing system combining equal channel angular extrusion (ECAP) pre-processing and multi-stage variable temperature rotary forging, achieving simultaneous improvement in alloy strength, conductivity, and saturation magnetization within a short processing time. The Cu-Fe alloy prepared by this invention can achieve a saturation magnetization of over 70 emu / g, while also exhibiting good strength and conductivity. Furthermore, the experimental scheme is simple and easy to operate. These advantages effectively reduce the size of power electronic components and improve their stability during operation, meeting the development needs of the power and electrical industry.

Description

Technical Field

[0001] This invention relates to a copper-iron alloy material with high saturation magnetization, its preparation method, and its application, belonging to the field of copper-iron alloy technology. Background Technology

[0002] With the rapid development of power electrical and microwave communication technologies, advanced systems place higher demands on the miniaturization, integration, and stability of devices. Driving materials must simultaneously meet the comprehensive performance requirements of high strength, high conductivity, and high saturation magnetization. Copper, due to its excellent electrical and thermal conductivity and processing properties, is widely used in key areas such as high-voltage conductors, integrated circuit lead frames, pulse magnet conductors, and high-speed rail contact wires, and also plays an important role in electromagnetic shielding applications. However, pure copper has low strength, and as a diamagnetic material, its inherent zero saturation magnetization severely restricts its application in dynamic electromagnetic field environments. Copper-iron alloys, by synergistically combining the electrical / thermal conductivity of the copper matrix with the high strength and high saturation magnetization of the iron phase, exhibit great application potential and have become a promising candidate material for next-generation electromagnetic shielding conductors in fields such as power transmission, communication base stations, and rail transportation.

[0003] Current research on copper-iron alloys mainly focuses on the synergistic optimization of strength and conductivity. However, as electromagnetic functional materials, the regulation of magnetic properties is equally crucial. High saturation magnetization can effectively suppress magnetic flux decay and eddy current heating during device operation, ensuring long-term operational stability. While traditional cold rolling / cold drawing processes can improve strength, they struggle to achieve dispersed precipitation of the Fe phase, resulting in limited improvement in magnetic properties. Existing technologies largely rely on long-term aging heat treatment to promote Fe atom diffusion precipitation. However, this approach has two major drawbacks: firstly, long-term aging destroys the alloy's strength, and some nano-precipitates are γ-Fe with an FCC structure, whose saturation magnetization is significantly lower than that of α-Fe with a BCC structure; secondly, prolonged production cycles lead to a significant increase in energy consumption and cost. Therefore, there is an urgent industrial need to develop a short-process, low-cost copper-iron alloy preparation technology that combines high strength, high conductivity, and ultra-high saturation magnetization.

[0004] The mainstream industry method for preparing high-strength, high-conductivity copper-iron alloys is the deformation in-situ composite method, which involves fiberizing the Fe phase through large-strain drawing / rolling and then controlling the properties through annealing. However, no magnetic property control mechanism has been introduced, and the saturation magnetization of the alloy has received very little attention. How to improve the saturation magnetization of copper-iron alloys while maintaining good strength and conductivity is a key technical bottleneck that urgently needs to be overcome. Summary of the Invention

[0005] To address the above problems, the present invention aims to provide a copper-iron alloy material with high saturation magnetization. This material improves the saturation magnetization of the copper-iron alloy while maintaining good strength and conductivity. It is suitable for electromagnetic shielding materials and miniaturized, highly integrated, and highly stable power electrical components such as PCB circuit boards, sensors, and inductors.

[0006] Meanwhile, this invention provides a method for preparing copper-iron alloy materials with high saturation magnetization.

[0007] Meanwhile, this invention provides an application of a copper-iron alloy material with high saturation magnetization.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0009] A copper-iron alloy material with high saturation magnetization, specifically a Cu-Fe alloy material with a combination of high saturation magnetization, good strength, and conductivity, wherein the Fe content is 15-30 wt.%, and the balance is Cu and unavoidable impurities. The introduction of the Fe phase endows the material with good saturation magnetization, transforming the material into a paramagnetic material and exhibiting typical soft magnetic material characteristics.

[0010] A method for preparing a copper-iron alloy material with high saturation magnetization, specifically the method for preparing a copper-iron alloy material with high saturation magnetization and good strength and conductivity as mentioned above, includes the following steps:

[0011] Step 1: The copper-iron alloy composition is Cu-XFe. The raw material metals are mixed according to the ratio, with the Fe content being 15-30 wt.% and the balance being Cu and unavoidable impurities.

[0012] Step two: Place the raw materials into a ceramic crucible and evacuate to 10°C. -1 Below Pa, argon gas is introduced to atmospheric pressure and then heated for melting; preferably, the ceramic crucible is pre-dried and preheated; after introducing argon gas to atmospheric pressure, a vacuum is evacuated again to 10 Pa. -1 The pressure is below 1 Pa and heating and melting begins (this step is mainly to ensure that there is no oxygen during melting, or it can be simplified to simply drawing a vacuum).

[0013] Step 3: Remelt the material 3 to 5 times to ensure the melt is uniform, then heat it to 30 to 50 K above the liquidus line and hold it for 3 to 5 minutes before casting to obtain an ingot;

[0014] Step 4: Homogenize the ingot by heating the muffle furnace to 700-950°C, placing the ingot in, holding it for 120-300 minutes, then removing it and quenching it with water to obtain a homogenized alloy ingot.

[0015] Step 5 involves subjecting the homogenized alloy ingot to digging and rotating extrusion at 300℃~550℃, followed by variable-temperature rotary forging.

[0016] S01, Equal Channel Angular Extrusion: After grinding the homogenized alloy ingot to remove oxide scale and burrs, continuous equal channel angular extrusion is performed at 300℃~550℃, with an angle of 90°~120°, an extrusion path of Ba, and 1-8 extrusion passes. The ingot is then quenched with water to obtain the extruded sample.

[0017] S02, Variable Temperature Rotary Forging: After the sample is extruded through a rotating die and other channels, it is cut using an EDM wire cutter to remove edge defects and polish to remove oxide scale and burrs. Then, it is rotary forged at temperatures of 800℃~950℃, 300℃~550℃, and room temperature. The single-pass reduction is 0.1mm~0.5mm. The strain of rotary forging at 800℃~950℃ is 0.1~0.2; the strain of rotary forging at 300℃~550℃ is 0.2~0.3; the strain of rotary forging at room temperature is 0.7~1.0; and the cumulative rotary forging strain is 1.0-1.5, obtaining an extruded + rotary forged sample.

[0018] As a preferred embodiment of the present invention, in step one, the purity of Cu and Fe is not less than 99.99 wt.%.

[0019] As a preferred technical solution of the present invention, in step two, the heating and melting is carried out by heating to 1350-1550°C in a medium-frequency induction furnace.

[0020] As a preferred technical solution of the present invention, in step five, the extrusion temperature during the extrusion process of the rotating die and other channel corners is 300℃~550℃, and the sample is kept warm every 4 passes for 5~30 minutes.

[0021] As a preferred technical solution of the present invention, in step five, the rotary forging temperatures are 800℃~950℃, 300℃~550℃ and room temperature, respectively, and the cumulative rotary forging strain is 1.5.

[0022] As a preferred embodiment of the present invention, the Cu-Fe alloy material with high saturation magnetization obtained by any one of the methods described herein has a saturation magnetization greater than 35 emu / g. The hot extrusion at the channel angle using a rotating die not only increases the dislocation density in the Cu matrix, providing sites for Fe atom precipitation, but the higher temperature also provides a driving force for the diffusion precipitation of Fe atoms. Furthermore, the higher extrusion temperature causes the Cu supersaturated solid solution to undergo amplitude modulation decomposition, resulting in the precipitation of Fe atoms as the FCC-structured γ-Fe phase. Subsequent variable-temperature rotary forging further elongates the precipitated Fe atoms and the Fe phase, and promotes the transformation of the γ-Fe phase into the BCC-structured α-Fe phase, ultimately obtaining a slender α-Fe phase distributed fibrously in parallel along the axial direction, achieving a simultaneous improvement in material strength, conductivity, and saturation magnetization.

[0023] Meanwhile, this invention provides an application of Cu-Fe alloy materials with high saturation magnetization and a good combination of strength and conductivity. Specifically, it is applied to electromagnetic shielding materials and miniaturized, highly integrated, and highly stable power and electrical components such as PCB circuit boards, sensors, and inductors.

[0024] Application of a copper-iron alloy material with high saturation magnetization in power electrical components and electromagnetic shielding materials.

[0025] Electrical components and electromagnetic shielding materials include electromagnetic compatibility components, lead frames for integrated circuits, and pulse magnet conductor materials.

[0026] An electrical component and an electromagnetic shielding material are prepared from a copper-iron alloy material with high saturation magnetization intensity according to the present invention.

[0027] The advantages of this invention are:

[0028] In the variable-temperature rotary forging process of this invention, the high temperature (800℃~950℃) aims to accelerate atomic diffusion, enhance the plastic deformation capacity of the alloy to quickly elongate the bar and decompose the supersaturated Cu solid solution; the medium temperature (300℃~550℃) aims to reduce the solid solubility of Fe in Cu, further promote the precipitation of Fe atoms and release lattice distortion energy, and prevent the recrystallization of copper grains due to room temperature deformation, thereby improving the conductivity of the alloy; the low temperature (room temperature) aims to further elongate and refine the Fe phase and Cu matrix structure and increase the dislocation density to improve the strength of the alloy.

[0029] Addressing the industry challenge of low saturation magnetization and limited electromagnetic stability in traditional Cu-Fe alloys due to the sluggish Fe phase precipitation kinetics, this invention's core innovation lies in constructing a composite processing system that combines equal channel corner extrusion (ECAP) pre-processing with multi-stage variable temperature rotary forging. This system simultaneously enhances alloy strength, conductivity, and saturation magnetization within a short processing time. The invention utilizes high-temperature ECAP to achieve dual-path synergistic precipitation of the Fe phase: on one hand, nucleating and growing α-Fe phases at grain boundaries; on the other hand, forming dispersed γ-Fe phases in the Cu matrix through amplitude modulation decomposition. Based on this, a multi-stage variable temperature rotary forging process leverages the synergistic effect of temperature and stress to enhance Fe atom diffusion and precipitation behavior, triggering the transformation of the FCC-structured γ-Fe phase into the BCC-structured α-Fe phase. Simultaneously, it achieves nano-elongation and optimized dispersion of the Fe phase, ultimately yielding a Cu-Fe alloy material with high strength, high conductivity, and ultra-high saturation magnetization. This invention breaks through the limitations of traditional processes, innovatively solving three major technical challenges—slow Fe phase precipitation kinetics, uneven distribution, and poor structural stability—simultaneously by matching the parameters of ECAP and rotary forging. The resulting Cu-15Fe alloy material exhibits significantly improved performance, with a saturation magnetization of 74 emu / g (nearly double that of traditional processes), a tensile strength of 654 MPa, and a conductivity of 65% IACS. This process eliminates the need for lengthy aging heat treatment, significantly shortens the processing cycle, and achieves precise control over the distribution of the α / γ-Fe phase, providing a new approach for the development of high-performance electromagnetic shielding materials.

[0030] The Cu-Fe alloy prepared by this invention can achieve a saturation magnetization of over 70 emu / g, while also possessing good strength and conductivity. Furthermore, the experimental scheme is simple and easy to operate. These advantages can effectively reduce the size of power electronic components and improve their stability during operation, thus meeting the development needs of the power and electrical industry. Attached Figure Description

[0031] Figure 1 This is a process flow diagram of the present invention;

[0032] Figure 2 This is a diagram illustrating the variable-temperature rotary forging mechanism in this invention;

[0033] Figure 3 The strength, conductivity, and saturation magnetization of the alloy after different processing steps in this invention are shown. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The following embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0035] Example 1

[0036] like Figures 1-2As shown, a method for preparing a copper-iron alloy material with high saturation magnetization, namely a method for preparing a copper-iron alloy material with high strength, high conductivity, and high saturation magnetization, includes the following steps:

[0037] Step 1: The copper-iron alloy composition is Cu-Fe. The raw material metals are mixed according to the ratio, with Fe content of 15wt.% and the balance being Cu and unavoidable impurities; the purity of both copper and iron is not less than 99.99wt.%.

[0038] Step two: Place the raw materials Cu and Fe into a ceramic crucible and evacuate to 10°C. -1 Below Pa, argon gas is introduced to atmospheric pressure, and then the medium-frequency induction furnace is used to heat to 1350℃ for melting;

[0039] Step 3: Remelt the material 4 times to ensure the melt is uniform, then heat it to 40K above the liquidus line and hold it for 3 minutes before casting to obtain an ingot;

[0040] Step 4: Homogenize the ingot by heating the muffle furnace to 900°C, placing the ingot in, holding it for 120 minutes, then removing it and quenching it with water to eliminate macroscopic element segregation in the as-cast structure and obtain a homogenized alloy ingot.

[0041] Step 5: Apply angular extrusion and variable-temperature rotary forging deformation to the homogenized alloy ingot using a rotating die. The process is as follows:

[0042] S01, Equal Channel Angular Extrusion: After grinding the homogenized alloy ingot to remove oxide scale and burrs, continuous equal channel angular extrusion is performed at 550℃ with an angle of 90° and 8 extrusion passes. The sample is held at temperature for 5 minutes after every 4 passes, and then quenched with water to obtain the extruded sample.

[0043] S02, Variable Temperature Rotary Forging: The sample, after being extruded through a rotating die and other channels, is cut using an EDM wire cutter to remove edge defects and polish to remove oxide scale and burrs. It is then rotary forged at 900℃, 550℃, and room temperature, with forging strains of 0.2, 0.3, and 1.0, respectively, and a cumulative forging strain of 1.5, obtaining an extruded + rotary forged sample, i.e., as shown... Figure 3 The 8P+RS-1.5 sample shown.

[0044] Applications of Cu-Fe alloys with a combination of high saturation magnetization, good strength and conductivity in power electrical components and electromagnetic shielding materials.

[0045] Electrical components and electromagnetic shielding materials include high-voltage conductors, lead frames for integrated circuits, pulse magnet conductor materials, contact wires for electrified high-speed railways, and electromagnetic shielding materials.

[0046] An electrical component and an electromagnetic shielding material, comprising a Cu-Fe alloy material with a combination of high saturation magnetization, good strength and conductivity as described in this embodiment.

[0047] In this embodiment, the power electrical components and electromagnetic shielding materials are materials with high strength, high conductivity, and high saturation magnetization.

[0048] Using this method to prepare copper-iron alloys can achieve extremely high saturation magnetization while ensuring a good combination of strength and conductivity, such as... Figure 3 As shown. When the sample is subjected to conventional room temperature rolling (R85%), the alloy strength and saturation magnetization increase, but the conductivity decreases, and the saturation magnetization is not outstanding. After the sample undergoes 8 extrusion passes, its strength, conductivity, and saturation magnetization all improve to some extent, but the improvement is small. Variable temperature rotary forging of the material in the channel corner extrusion state using a rotating die can simultaneously improve the material's strength and conductivity, and exhibits extremely high saturation magnetization. After composite processing, the alloy strength, conductivity, and saturation magnetization are 654 MPa, 65% IACS, and 74 emu / g, respectively.

[0049] The strength and conductivity data of the high-strength, high-conductivity copper-iron alloys obtained in Examples 1 to 3 and Comparative Examples 1 to 5 of the present invention are shown in Table 1 below.

[0050] Table 1 Properties of High Saturation Magnetization Copper-Iron Alloys

[0051]

[0052]

[0053] The strength test method is as follows: the material strength is the tensile strength of the material. The deformed specimen is processed into a dog bone-shaped tensile specimen with a gauge length of 6 mm using a wire cutting machine, and then polished to remove oxide products and burrs to ensure that the shape of the tensile specimen is uniform and to avoid stress concentration. Then, a tensile test is performed to obtain its tensile strength at a tensile speed of 0.36 mm / min.

[0054] The conductivity test method is as follows: the sample is processed into... The resistance of the cylindrical sample was measured using a QJ36S DC resistance tester, and then converted to conductivity using the formula (1.7241*L) / (Rx*S)*100%, where L is the length of the sample, Rx is the measured resistance of the sample, and S is the cross-sectional area of ​​the sample.

[0055] The test method for saturation magnetization is as follows: The sample is processed into a 2*2*2mm sheet using a wire cutting machine, then the thickness is reduced to 0.1μm using sandpaper, and the weight is measured using a precision electronic balance. The saturation magnetization of the sample is measured using a Lake Shore-7407 vibrating sample magnetometer, and the temperature is maintained at 20℃ during the measurement.

[0056] Comparative Example 1

[0057] The only difference between this comparative example and Example 1 is that this comparative example only uses steps one through four to prepare a homogenized alloy ingot, which is... Figure 3 HH sample in.

[0058] Comparative Example 2

[0059] The only difference between this comparative example and Example 1 is that: after preparing a homogenized alloy ingot in steps one through four, this comparative example uses a conventional room temperature rolling process to obtain the sample.

[0060] The conventional room temperature rolling process is as follows: after grinding the homogenized alloy ingot to remove oxide scale and burrs, it is rolled at room temperature with a rolling reduction of 85% to obtain... Figure 3 The R85% sample.

[0061] Comparative Example 3

[0062] The only difference between this comparative example and Example 1 is that: after obtaining the homogenized alloy ingot through steps one to four, this comparative example only uses the equal channel corner extrusion process in S01 to obtain the alloy as shown in Example 1. Figure 3 The 8P sample shown.

[0063] Comparative Example 4

[0064] The only difference between this comparative example and Example 1 is that, after obtaining the homogenized alloy ingot through steps one to four, this comparative example only uses the variable-temperature rotary forging process in SO2 to obtain the desired result. Figure 3 The RS-1.5 sample shown.

[0065] Comparative Example 5

[0066] The only difference between this comparative example and Example 1 is that: in this comparative example, after preparing a homogenized alloy ingot using steps one through four, the ingot is then subjected to the equal channel corner extrusion process in SO1, followed by room temperature rolling with a rolling reduction of 85%, to obtain... Figure 3 The 8P+R85% sample.

[0067] Example 2

[0068] A method for preparing a copper-iron alloy material with high saturation magnetization, namely a method for preparing a copper-iron alloy material with high strength, high conductivity, and high saturation magnetization, includes the following steps:

[0069] Step 1: The copper-iron alloy composition is Cu-Fe. The raw material metals are mixed according to the ratio, with Fe content of 30wt.% and the balance being Cu and unavoidable impurities; the purity of both copper and iron is not less than 99.99wt.%.

[0070] Step two: Place the raw materials Cu and Fe into a ceramic crucible and evacuate to 10°C. -1 Below Pa, argon gas is introduced to atmospheric pressure, and then the medium-frequency induction furnace is used to heat to 1550℃ for melting.

[0071] Step 3: Remelt the material three times to ensure the melt is uniform, then heat it to 30K above the liquidus line and hold it for 5 minutes before casting to obtain an ingot;

[0072] Step 4: Homogenize the ingot by heating the muffle furnace to 700°C, placing the ingot in, holding it at that temperature for 300 minutes, then removing it and quenching it with water to eliminate macroscopic element segregation in the as-cast structure and obtain a homogenized alloy ingot.

[0073] Step 5: Apply angular extrusion and variable-temperature rotary forging deformation to the homogenized alloy ingot using a rotating die. The process is as follows:

[0074] S01, Equal Channel Angular Extrusion: After grinding the homogenized alloy ingot to remove oxide scale and burrs, continuous equal channel angular extrusion is performed at 300℃ with an angle of 120° and 4 extrusion passes. After extrusion, the sample is held at temperature for 30 minutes, and then quenched with water to obtain the extruded sample.

[0075] S02, Variable Temperature Rotary Forging: The sample after being squeezed through the rotating die and other channels is cut by an EDM wire cutter to remove edge defects and grind to remove oxide scale and burrs. Then, it is rotated at 800℃, 300℃ and room temperature, respectively, with rotational forging strains of 0.1, 0.2 and 0.7, respectively, and the cumulative rotational forging strain is 1.0, to obtain the squeezed + rotated forged sample.

[0076] Applications of Cu-Fe alloys with a combination of high saturation magnetization, good strength and conductivity in power electrical components and electromagnetic shielding materials.

[0077] Electrical components and electromagnetic shielding materials include high-voltage conductors, lead frames for integrated circuits, pulse magnet conductor materials, contact wires for electrified high-speed railways, and electromagnetic shielding materials.

[0078] An electrical component and an electromagnetic shielding material, comprising a Cu-Fe alloy material with a combination of high saturation magnetization, good strength and conductivity as described in this embodiment.

[0079] Example 3

[0080] A method for preparing a copper-iron alloy material with high saturation magnetization, namely a method for preparing a copper-iron alloy material with high strength, high conductivity, and high saturation magnetization, includes the following steps:

[0081] Step 1: The copper-iron alloy composition is Cu-Fe. The raw material metals are mixed according to the formula, with the Fe content being 20 wt.% and the balance being Cu and unavoidable impurities; the purity of both copper and iron is not less than 99.99 wt.%.

[0082] Step two: Place the raw materials Cu and Fe into a ceramic crucible and evacuate to 10°C. -1 Below Pa, argon gas is introduced to atmospheric pressure, and then the medium-frequency induction furnace is used to heat to 1450℃ for melting.

[0083] Step 3: Remelt the material 5 times to ensure the melt is uniform, then heat it to 50K above the liquidus line and hold it for 4 minutes before casting to obtain an ingot;

[0084] Step 4: Homogenize the ingot by heating the muffle furnace to 950°C, placing the ingot in, holding it at that temperature for 200 minutes, then removing it and quenching it with water to eliminate macroscopic element segregation in the as-cast structure and obtain a homogenized alloy ingot.

[0085] Step 5: Apply angular extrusion and variable-temperature rotary forging deformation to the homogenized alloy ingot using a rotating die. The process is as follows:

[0086] S01, Equal Channel Angular Extrusion: After grinding the homogenized alloy ingot to remove oxide scale and burrs, continuous equal channel angular extrusion is performed at 450℃ with an angle of 90° and one extrusion pass. After extrusion, the sample is held at temperature for 15 minutes, and then quenched with water to obtain the extruded sample.

[0087] S02, Variable Temperature Rotary Forging: The sample after being squeezed through the rotating die and other channels is cut by an EDM wire cutter to remove edge defects and grind to remove oxide scale and burrs. Then, it is rotated at 950℃, 450℃ and room temperature, respectively, with rotational forging strains of 0.1, 0.3 and 0.8, respectively, and a cumulative rotational forging strain of 1.2, to obtain the squeezed + rotated forged sample.

[0088] Applications of Cu-Fe alloys with a combination of high saturation magnetization, good strength and conductivity in power electrical components and electromagnetic shielding materials.

[0089] Electrical components and electromagnetic shielding materials include high-voltage conductors, lead frames for integrated circuits, pulse magnet conductor materials, contact wires for electrified high-speed railways, and electromagnetic shielding materials.

[0090] An electrical component and an electromagnetic shielding material, comprising a Cu-Fe alloy material with a combination of high saturation magnetization, good strength and conductivity as described in this embodiment.

[0091] Finally, it should be noted that the above embodiments are only for illustrating the technical concept and features of the present invention and are not intended to limit it. Different preparation methods can still be modified according to this technical solution, and the modified technical solution cannot deviate from the spirit of the technical solution of the present invention.

[0092] It should be understood that, in order to simplify this disclosure and aid in understanding one or more of the various aspects of the invention, features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof in the above description of exemplary embodiments of the invention. However, this method of disclosure should not be interpreted as reflecting an intention that the claimed invention requires more features than expressly recited in each claim. Rather, as reflected in the claims, inventive aspects lie in fewer than all the features of the foregoingly disclosed embodiments. Therefore, the claims, following the detailed description, are hereby expressly incorporated into that detailed description, wherein each claim itself is a separate embodiment of the invention.

[0093] Although the invention has been described with reference to a limited number of embodiments, those skilled in the art will understand from the foregoing description that other embodiments are conceivable within the scope of the invention described herein. Furthermore, it should be noted that the language used in this specification has been chosen primarily for readability and instructional purposes, and not for the purpose of interpreting or limiting the subject matter of the invention. Therefore, many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the appended claims. The disclosure of the invention is illustrative and not restrictive, and the scope of the invention is defined by the appended claims.

[0094] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A copper-iron alloy material with high saturation magnetization, characterized in that, The Fe content is 15~30 wt.%, with the balance being Cu and unavoidable impurities; The preparation method includes the following steps: Step 1: Mix the raw materials Cu and Fe metals according to the specified ratio; Step two: Place the raw materials into a ceramic crucible and evacuate to 10°C. -1 Below Pa, heat and melt; Step 3: Remelt the material 3-5 times to ensure the melt is uniform, then heat it to 30-50 K above the liquidus line and hold it for 3-5 minutes before casting to obtain an ingot; Step 4: Homogenize the ingot by heating the muffle furnace to 700-950°C, placing the ingot in, holding it for 120-300 minutes, then removing it and quenching it with water to obtain a homogenized alloy ingot. Step 5 involves subjecting the homogenized alloy ingot to die-changing, channel-angle extrusion and variable-temperature rotary forging deformation. The process is as follows: S01, Equal-channel angular extrusion processing: After grinding the homogenized alloy ingot, continuous equal-channel angular extrusion is performed at 300℃~550℃, with a die angle of 90°~120° and 1-8 extrusion passes. The ingot is then quenched with water to obtain the extruded sample. S02, Variable Temperature Rotary Forging: After removing the oxide scale and burrs from the sample after it has been extruded through the rotating die and other channels, it is then rotary forged at a gradient temperature. The rotary forging strain is 1.0~1.5, and the extruded + rotary forged sample is obtained. In S02, the gradient temperatures are 800℃~950℃, 300℃~550℃ and room temperature, respectively; the strain of rotary forging at 800℃~950℃ is 0.1~0.2; the strain of rotary forging at 300℃~550℃ is 0.2~0.3; and the strain of rotary forging at room temperature is 0.7~1.

0.

2. The method for preparing a copper-iron alloy material with high saturation magnetization according to claim 1, characterized in that, Includes the following steps: Step 1: Mix the raw materials Cu and Fe metals according to the specified ratio; Step two: Place the raw materials into a ceramic crucible and evacuate to 10°C. -1 Below Pa, heat and melt; Step 3: Remelt the material 3-5 times to ensure the melt is uniform, then heat it to 30-50 K above the liquidus line and hold it for 3-5 minutes before casting to obtain an ingot; Step 4: Homogenize the ingot by heating the muffle furnace to 700-950°C, placing the ingot in, holding it for 120-300 minutes, then removing it and quenching it with water to obtain a homogenized alloy ingot. Step 5 involves subjecting the homogenized alloy ingot to die-changing, channel-angle extrusion and variable-temperature rotary forging deformation. The process is as follows: S01, Equal-channel angular extrusion processing: After grinding the homogenized alloy ingot, continuous equal-channel angular extrusion is performed at 300℃~550℃, with a die angle of 90°~120° and 1-8 extrusion passes. The ingot is then quenched with water to obtain the extruded sample. S02, Variable Temperature Rotary Forging: After removing the oxide scale and burrs from the sample after it has been extruded through the rotating die and other channels, it is then rotary forged at a gradient temperature. The rotary forging strain is 1.0~1.5, and the extruded + rotary forged sample is obtained. In S02, the gradient temperatures are 800℃~950℃, 300℃~550℃ and room temperature, respectively; the strain of rotary forging at 800℃~950℃ is 0.1~0.2; the strain of rotary forging at 300℃~550℃ is 0.2~0.3; and the strain of rotary forging at room temperature is 0.7~1.

0.

3. The preparation method according to claim 2, characterized in that, In step one, the purity of Cu and Fe is not less than 99.99 wt.%.

4. The preparation method according to claim 2, characterized in that, In step two, the heating and melting process involves heating the furnace to 1350~1550℃ using a medium-frequency induction furnace.

5. The preparation method according to claim 2, characterized in that, In S01, during the extrusion process at the corners of the channel such as the mold rotation, the sample is kept warm every 4 passes, and the sample is kept warm for 5 to 30 minutes.

6. The application of the high saturation magnetization copper-iron alloy material according to claim 1 in power electrical components and electromagnetic shielding materials.

7. The application according to claim 6, characterized in that, Electrical components and electromagnetic shielding materials include electromagnetic compatibility components, lead frames for integrated circuits, and pulse magnet conductor materials.

8. A power electrical component and an electromagnetic shielding material, characterized in that, It is prepared from the copper-iron alloy material with high saturation magnetization as described in claim 1.

Images