WO2021098381A1 - Method for preparing copper-iron alloy material having electromagnetic shielding performance - Google Patents

Abstract

A method for preparing a copper-iron alloy material that has an electromagnetic shielding performance, comprising smelting: weighing a CuFe master alloy and an electrolytic copper plate according to mass percentage, and smelting in an intermediate-frequency induction furnace to obtain a uniform alloy solution; casting: using a graphite-lined copper crystallizer to cool and crystallize the foregoing alloy solution to obtain a rectangular alloy ingot; hot rolling: heating the alloy ingot, and carrying out hot rolling in several passes on a two-roll reversible rolling mill; surface milling: milling the hot rolled billet sheet up and down on a double-sided milling device; cold rolling and annealing: carrying out cold rolling on a strip, and carrying out an annealing treatment during cold rolling to obtain a semi-finished strip; heat treatment and cleaning: carrying out a heat treatment on the semi-finished strip, and after the heat treatment, carrying out surface cleaning to obtain a finished alloy strip.

Description

Method for preparing copper-iron alloy material with electromagnetic shielding performance

This application claims the priority of the Chinese patent application 201910782289X whose filing date is 2019/11/23. This application quotes the full text of the aforementioned Chinese patent application.

Technical field

The invention relates to the technical field of electromagnetic shielding, in particular to a method for preparing a copper-iron alloy material with electromagnetic shielding performance.

Background technique

With the rapid development of modern electronic information, more and more electronic and electrical equipment have been put into use. At the same time, electromagnetic waves of different frequencies and energy generated by these electronic equipment are flooding people’s lives with a new source of pollution. , Together with the current water pollution, noise pollution, and air pollution, are called the four major pollution. Electromagnetic radiation pollution is caused by electromagnetic waves distributed in space. The electromagnetic radiation hazards caused by electromagnetic waves mainly include the negative impact on human health, the impact on the natural environment, and the interference to electronic equipment.

At present, metal electromagnetic shielding materials are generally divided into two categories: ① Good conductor shielding materials, which are often used for shielding electrostatic fields and high and low frequency electromagnetic fields due to their high conductivity, such as copper, aluminum, nickel, etc.; ② Ferromagnetic shielding materials, which are often used for shielding low-frequency (f<100KHz) magnetic fields due to their high magnetic permeability, such as iron, silicon steel and Pypermalloy. Therefore, electromagnetic shielding protection methods play a very important role in modern life and become one of the key topics of future research.

Summary of the invention

In view of the above-mentioned technical problems, the present invention provides a method for preparing a copper-iron alloy material with uniform structure, high electrical conductivity and magnetic permeability.

The technical scheme of the present invention is: a preparation method of a copper-iron alloy material with electromagnetic shielding performance, including:

1) Smelting: the ingredients are calculated by percentage, the percentage of Fe in the raw material is 5%-10%, and the percentage of Cu in the raw material is 90%-95%; use an intermediate frequency induction furnace for smelting, in the process The degassing and deoxidation process is combined with electromagnetic stirring to obtain a uniform alloy solution; among them, the Fe element is added in the form of a CuFe master alloy, and the Cu element is an electrolytic copper plate;

2) Casting: Use a graphite-lined copper crystallizer to cool and crystallize the alloy solution obtained in 1) at a casting speed of 50-100 mm/min to obtain a rectangular alloy ingot;

3) Hot rolling: Use a gas furnace to heat the alloy ingots obtained in step 2) at a heating temperature of 890°C to 930°C, and after holding for 3-4 hours, hot rolling is carried out in multiple passes on a two-roll reversing rolling mill;

4) Face milling: the hot-rolled billet in step 3) is milled up and down on the double-sided milling equipment, and the milling thickness is 0.5mm-1mm;

5) Cold rolling and annealing: cold rolling the strip obtained in step 4), annealing during the cold rolling process, annealing with a bell furnace, and annealing temperature controlled at 600°C-700°C to obtain a semi-finished strip;

6) Heat treatment and cleaning: the semi-finished strip obtained in step 5) is subjected to heat treatment, the heat treatment temperature is controlled at 450°C-550°C, and the surface is cleaned after the heat treatment to obtain the finished alloy strip.

Further, the specific operation of step 3) is: first preheat the two-roll reversible rolling mill to a temperature of 750°C-850°C, and then hot-roll the alloy ingot through 4-8 passes until the thickness of the alloy ingot is 70- 95mm; Under this process, the alloy can achieve the purpose of homogenizing the alloy composition and reduce the precipitation of metal particles after hot rolling.

Further, in step 4), the upper milling feed rate is 30-60 mm/min, and the lower milling feed rate is 50-90 mm/min.

Further, in step 5), during the annealing process, nitrogen and methanol are added to the bell furnace, the flow rate of nitrogen is 2m ³ /h-4m ³ /h, and the flow rate of methanol is 0.08L/h-0.15L/h, The heating time is 15min-45min, the heating temperature is 620℃-670℃, the heat preservation treatment is 0.5h-2.0h, the pressure inside the bell furnace is controlled to 180Pa-320Pa; the magnetic permeability of the strip is improved, and the strip is placed in the heat treatment It is oxidized in the process.

Further, in step 6), the specific operation of the heat treatment is: in the first stage, the semi-finished strip is placed in the heat treatment furnace, and the heat preservation treatment is carried out for 1.2h-2h under the condition of 450℃-500℃; the second stage will The semi-finished strip is placed in the temperature of 500℃-700℃, heat preservation for 2h-4h, and then cooled to a temperature of 450℃-550℃, and the heat preservation treatment is 2.5h-4h; improve the tensile strength and bending resistance of the semi-finished strip Physical properties such as strength.

Further, after step 6) is completed, use a polishing device to polish the finished alloy strip, and use magnetic particle inspection and ultrasonic flaw detection for processing, check whether the finished alloy strip has cracks, and ensure that the finished alloy strip has no surface or interior. defect.

Further, in step 6), the semi-finished strip is first soaked in absolute alcohol, then ultrasonically cleaned with pure water, and finally dried with high-purity nitrogen; the surface of the semi-finished strip is cleaned to avoid impurities attached to the surface of the semi-finished strip Affect the electromagnetic shielding performance of alloy materials.

Compared with the prior art, the present invention has the beneficial effects: the copper-iron alloy material prepared by the present invention has a uniform structure, fine fibrous Fe phase, distributed parallel to the rolling direction, and has high electrical conductivity and magnetic permeability. Alloy material with its own electromagnetic shielding performance; the present invention changes the microstructure of the alloy material through heat treatment and annealing treatment, increases the crystallization volume fraction of the material, changes the shape of the material hysteresis line, and improves the induced anisotropy of the material , So that the atom diffusion in the alloy material is more significant, and the metallographic distribution is uniform.

Description of the drawings

Figure 1 is a process flow diagram of the present invention;

Figure 2 is a 50-fold morphology of the copper-iron alloy material prepared in Example 3 of the present invention under a microscope;

FIG. 3 is a topography view of a copper-iron alloy material prepared in Example 4 of the present invention under a microscope, magnified 100 times;

4 is a schematic structural diagram of a square ingot made of the copper-iron alloy material prepared in Example 4 of the present invention;

5 is a schematic structural diagram of a round ingot made of the copper-iron alloy material prepared in Example 4 of the present invention;

6 is a schematic structural diagram of a strip made of the copper-iron alloy material prepared in Example 1 of the present invention;

7 is a schematic structural view of a CFA95(t) 0.2mm copper-iron alloy heat sink made of the copper-iron alloy material prepared in Example 2 of the present invention;

Fig. 8 is a schematic structural diagram of a CFA95(t) 0.2mm CPU Cover made of the copper-iron alloy material prepared in Example 3 of the present invention;

9 is a schematic structural view of a shielding room made of copper-iron alloy material prepared in Example 5 of the present invention;

Fig. 10 is a schematic structural diagram of a CFA95(t) 0.3mm air conditioning pipe made of the copper-iron alloy material prepared in Example 6 of the present invention.

Detailed ways

Embodiment 1: A method for preparing a copper-iron alloy material with electromagnetic shielding performance, including:

1) Smelting: the ingredients are calculated in percentage, the percentage of Fe in the raw material is 5%, and the percentage of Cu in the raw material is 95%; use an intermediate frequency induction furnace to smelt, and perform degassing and deoxidizing procedures during the process. With electromagnetic stirring, a uniform alloy solution is obtained; among them, the Fe element is added in the form of a CuFe master alloy, and the Cu element is an electrolytic copper plate;

2) Casting: Use a graphite-lined copper crystallizer to cool and crystallize the alloy solution obtained in 1) at a casting speed of 50 mm/min to obtain a rectangular alloy ingot;

3) Hot rolling: Use a gas furnace to heat the alloy ingots obtained in step 2) at a heating temperature of 890°C. After holding for 3 hours, hot rolling is performed on a two-roll reversing mill in multiple passes; first, the two-roll reversing mill is preheated The temperature is 750℃, and then the alloy ingot is hot-rolled for 4 passes until the thickness of the alloy ingot is 70mm. Under this process, the alloy can achieve the purpose of homogenizing the alloy composition and reduce the precipitation of metal particles after hot rolling;

4) Face milling: the hot-rolled billet in step 3) is milled up and down on the double-sided milling equipment, and the milling thickness is 0.5mm;

5) Cold rolling and annealing: cold rolling the strip obtained in step 4), annealing during the cold rolling process, annealing with a bell furnace, and annealing temperature controlled at 600°C to obtain a semi-finished strip;

6) Heat treatment and cleaning: the semi-finished strip obtained in step 5) is subjected to heat treatment, the heat treatment temperature is controlled at 450°C, and the surface is cleaned after the heat treatment to obtain the finished alloy strip.

The shielded room method was used to test the prepared copper-iron alloy materials, and the test results are shown in Table 1.

The structural schematic diagram of the strip made of the copper-iron alloy material prepared in this embodiment is shown in FIG. 6.

Embodiment 2: A preparation method of a copper-iron alloy material with electromagnetic shielding performance, including:

1) Smelting: The ingredients are calculated by percentage, the percentage of Fe in the raw material is 8%, and the percentage of Cu in the raw material is 92%; use an intermediate frequency induction furnace to smelt, and perform degassing and deoxidizing procedures during the process. With electromagnetic stirring, a uniform alloy solution is obtained; among them, the Fe element is added in the form of a CuFe master alloy, and the Cu element is an electrolytic copper plate;

2) Casting: Use a graphite-lined copper crystallizer to cool and crystallize the alloy solution obtained in 1) at a casting speed of 80 mm/min to obtain a rectangular alloy ingot;

3) Hot rolling: Use a gas furnace to heat the alloy ingots obtained in step 2) at a heating temperature of 915°C and hold for 3.5 hours, then perform hot rolling in multiple passes on a two-roll reversible rolling mill; first, the two-roll reversible rolling mill is pre-heated. Heat to a temperature of 800°C, and then hot-roll the alloy ingot through 6 passes until the thickness of the alloy ingot is 82mm. Under this process, the alloy can achieve the purpose of homogenizing the alloy composition and reduce the precipitation of metal particles after hot rolling;

4) Face milling: the hot-rolled billet in step 3) is milled up and down on a double-sided milling machine with a milling thickness of 0.8mm; the upper milling feed rate is 46mm/min, and the lower milling feed rate is 77mm/ min;

5) Cold rolling and annealing: cold rolling of the strip obtained in step 4), annealing treatment during the cold rolling process, annealing with a bell furnace, and annealing temperature controlled at 660°C to obtain a semi-finished strip;

6) Heat treatment and cleaning: the semi-finished strip obtained in step 5) is subjected to heat treatment, the heat treatment temperature is controlled at 500° C., and the surface is cleaned after the heat treatment to obtain the finished alloy strip.

The shielded room method was used to test the prepared copper-iron alloy materials, and the test results are shown in Table 1.

The schematic diagram of the structure of the CFA95(t) 0.2mm copper-iron alloy heat sink made of the copper-iron alloy material prepared in this embodiment is shown in FIG. 7.

Embodiment 3: A preparation method of a copper-iron alloy material with electromagnetic shielding performance, including:

1) Smelting: The ingredients are calculated by percentage, the percentage of Fe in the raw material is 10%, and the percentage of Cu in the raw material is 90%; use an intermediate frequency induction furnace to smelt, and perform degassing and deoxidizing processes during the process. With electromagnetic stirring, a uniform alloy solution is obtained; among them, the Fe element is added in the form of a CuFe master alloy, and the Cu element is an electrolytic copper plate;

2) Casting: Use a graphite-lined copper crystallizer to cool and crystallize the alloy solution obtained in 1) at a casting speed of 100 mm/min to obtain a rectangular alloy ingot;

3) Hot rolling: Use a gas furnace to heat the alloy ingots obtained in step 2) at a heating temperature of 930°C, and after holding for 4 hours, perform hot rolling in passes on a two-roll reversible rolling mill; first, the two-roll reversible rolling mill is preheated The temperature is 850°C, and then the alloy ingot is hot-rolled for 8 passes until the thickness of the alloy ingot is 95mm. Under this process, the alloy can achieve the purpose of homogenizing the alloy composition and reduce the precipitation of metal particles after hot rolling;

4) Face milling: the hot-rolled billet in step 3) is milled up and down on a double-sided milling machine with a milling thickness of 1mm; the upper milling feed rate is 60mm/min, and the lower milling feed rate is 90mm/min ；

5) Cold rolling and annealing: cold rolling the strip obtained in step 4), annealing treatment during the cold rolling process, annealing with a bell furnace, the annealing temperature is controlled at 700 ℃, to obtain a semi-finished strip; Add nitrogen and methanol into the bell furnace. The flow rate of nitrogen is 2m ³ /h-4m ³ /h, the flow rate of methanol is 0.08L/h-0.15L/h, the heating time is 15min-45min, and the heating temperature is 620℃- 670℃, heat preservation treatment for 0.5h-2.0h, control the pressure in the bell furnace to 180Pa-320Pa; improve the magnetic permeability of the strip, and place the strip to be oxidized during the heat treatment;

6) Heat treatment and cleaning: the semi-finished strip obtained in step 5) is subjected to heat treatment, the heat treatment temperature is controlled at 550°C, and the surface is cleaned after the heat treatment to obtain the finished alloy strip.

The shielded room method was used to test the prepared copper-iron alloy materials, and the test results are shown in Table 1.

The topography of the copper-iron alloy material prepared in this embodiment under a microscope with a magnification of 50 times is shown in FIG. 2.

The schematic diagram of the structure of the CFA95(t) 0.2mm CPU Cover made of the copper-iron alloy material prepared in this embodiment is shown in FIG. 8.

Embodiment 4: A preparation method of a copper-iron alloy material with electromagnetic shielding performance, including:

1) Smelting: the ingredients are calculated in percentage, the percentage of Fe in the raw material is 5%, and the percentage of Cu in the raw material is 95%; use an intermediate frequency induction furnace to smelt, and perform degassing and deoxidizing procedures during the process. With electromagnetic stirring, a uniform alloy solution is obtained; among them, the Fe element is added in the form of a CuFe master alloy, and the Cu element is an electrolytic copper plate;

2) Casting: Use a graphite-lined copper crystallizer to cool and crystallize the alloy solution obtained in 1) at a casting speed of 50 mm/min to obtain a rectangular alloy ingot;

3) Hot rolling: Use a gas furnace to heat the alloy ingots obtained in step 2) at a heating temperature of 890°C. After holding for 3 hours, hot rolling is performed on a two-roll reversing mill in multiple passes; first, the two-roll reversing mill is preheated The temperature is 750℃, and then the alloy ingot is hot-rolled for 4 passes until the thickness of the alloy ingot is 70mm. Under this process, the alloy can achieve the purpose of homogenizing the alloy composition and reduce the precipitation of metal particles after hot rolling;

4) Face milling: the hot-rolled billet in step 3) is milled up and down on the double-sided milling equipment, and the milling thickness is 0.5mm;

5) Cold rolling and annealing: cold rolling the strip obtained in step 4), annealing during the cold rolling process, annealing with a bell furnace, and annealing temperature controlled at 600°C to obtain a semi-finished strip;

6) Heat treatment and cleaning: the semi-finished strip obtained in step 5) is subjected to heat treatment, the heat treatment temperature is controlled at 450 ℃, and the surface is cleaned after heat treatment to obtain the finished alloy strip; the specific operation of the heat treatment is: the semi-finished strip is placed in the first stage In the heat treatment furnace, under the condition of 450℃, heat preservation treatment for 1.2h; in the second stage, the semi-finished strip will be placed at the temperature of 500℃ for 2h, and then the temperature will be cooled to 450℃, and the temperature will be kept warm. Treatment for 2.5h; improve physical properties such as tensile strength and bending strength of semi-finished strips.

The shielded room method was used to test the prepared copper-iron alloy materials, and the test results are shown in Table 1.

The morphology of the copper-iron alloy material prepared in this embodiment under a microscope with a magnification of 100 times is shown in FIG. 3.

The schematic diagram of the structure of the square ingot made of the copper-iron alloy material prepared in this embodiment is shown in FIG. 4.

The schematic diagram of the structure of the round ingot made of the copper-iron alloy material prepared in this embodiment is shown in FIG. 5.

Embodiment 5: A preparation method of a copper-iron alloy material with electromagnetic shielding performance, including:

1) Smelting: The ingredients are calculated by percentage, the percentage of Fe in the raw material is 8%, and the percentage of Cu in the raw material is 92%; use an intermediate frequency induction furnace to smelt, and perform degassing and deoxidizing procedures during the process. With electromagnetic stirring, a uniform alloy solution is obtained; among them, the Fe element is added in the form of a CuFe master alloy, and the Cu element is an electrolytic copper plate;

2) Casting: Use a graphite-lined copper crystallizer to cool and crystallize the alloy solution obtained in 1) at a casting speed of 80 mm/min to obtain a rectangular alloy ingot;

3) Hot rolling: Use a gas furnace to heat the alloy ingots obtained in step 2) at a heating temperature of 915°C and hold for 3.5 hours, then perform hot rolling in multiple passes on a two-roll reversible rolling mill; first, the two-roll reversible rolling mill is pre-heated. Heat to a temperature of 800°C, and then hot-roll the alloy ingot through 6 passes until the thickness of the alloy ingot is 82mm. Under this process, the alloy can achieve the purpose of homogenizing the alloy composition and reduce the precipitation of metal particles after hot rolling;

4) Face milling: the hot-rolled billet in step 3) is milled up and down on a double-sided milling machine with a milling thickness of 0.8mm; the upper milling feed rate is 46mm/min, and the lower milling feed rate is 77mm/ min;

5) Cold rolling and annealing: cold rolling of the strip obtained in step 4), annealing treatment during the cold rolling process, annealing with a bell furnace, and annealing temperature controlled at 660°C to obtain a semi-finished strip;

6) Heat treatment and cleaning: heat treatment of the semi-finished strip obtained in step 5). The heat treatment temperature is controlled at 500°C. After heat treatment, the surface is cleaned to obtain a finished alloy strip; the finished alloy strip is polished by a polishing device and used Magnetic particle flaw detection and ultrasonic flaw detection are performed to check whether there are cracks in the finished alloy strip, and to ensure that the finished alloy strip has no defects on the surface and inside.

The shielded room method was used to test the prepared copper-iron alloy materials, and the test results are shown in Table 1.

The schematic diagram of the structure of the shielding room made of the copper-iron alloy material prepared in this embodiment is shown in FIG. 9.

Embodiment 6: A preparation method of a copper-iron alloy material with electromagnetic shielding performance, including:

1) Smelting: The ingredients are calculated by percentage, the percentage of Fe in the raw material is 8%, and the percentage of Cu in the raw material is 92%; use an intermediate frequency induction furnace to smelt, and perform degassing and deoxidizing procedures during the process. With electromagnetic stirring, a uniform alloy solution is obtained; among them, the Fe element is added in the form of a CuFe master alloy, and the Cu element is an electrolytic copper plate;

2) Casting: Use a graphite-lined copper crystallizer to cool and crystallize the alloy solution obtained in 1) at a casting speed of 77 mm/min to obtain a rectangular alloy ingot;

3) Hot rolling: Use a gas furnace to heat the alloy ingots obtained in step 2) at a heating temperature of 915°C and hold for 3.5 hours, then perform hot rolling in multiple passes on a two-roll reversible rolling mill; first, the two-roll reversible rolling mill is pre-heated. Heat to a temperature of 800℃, and then hot-roll the alloy ingot through 4-8 passes until the thickness of the alloy ingot is 83mm; under this process, the alloy can achieve the purpose of homogenizing the alloy composition and reduce the precipitation of metal particles after hot rolling ；

4) Face milling: the hot-rolled billet in step 3) is milled up and down on a double-sided milling machine with a milling thickness of 0.8mm; the upper milling feed rate is 48mm/min, and the lower milling feed rate is 77mm/ min;

5) Cold rolling and annealing: cold rolling the strip obtained in step 4), annealing treatment during the cold rolling process, annealing with a bell furnace, the annealing temperature is controlled at 650 ℃, to obtain a semi-finished strip; Add nitrogen and methanol into the bell furnace, the nitrogen flow rate is 3m ³ /h, the methanol flow rate is 0.12L/h, the heating time is 32min, the heating temperature is 650℃, the heat preservation treatment is 1.5h, and the furnace of the bell furnace is controlled The pressure is 260Pa; improve the magnetic permeability of the strip and prevent the strip from being oxidized during the heat treatment process;

6) Heat treatment and cleaning: the semi-finished strip obtained in step 5) is subjected to heat treatment, the heat treatment temperature is controlled at 510°C, and the surface is cleaned after the heat treatment to obtain the finished alloy strip; the specific operation of the heat treatment is: the semi-finished strip is placed in the first stage In the heat treatment furnace, at a temperature of 470℃, heat preservation treatment for 1.7h; in the second stage, the semi-finished strip is placed at a temperature of 610℃, kept for 3h, and then cooled to a temperature of 510℃. Processing for 3.5h; improve the tensile strength, bending strength and other physical properties of the semi-finished strip, use a polishing device to polish the finished alloy strip, and use magnetic particle inspection and ultrasonic inspection to process, check whether the finished alloy strip has cracks , To ensure that the finished alloy strip is free from defects on the surface and inside. When cleaning the surface, the semi-finished strip is first soaked in anhydrous alcohol, then cleaned with pure water ultrasonically, and finally dried with high-purity nitrogen; by cleaning the surface of the semi-finished strip To prevent the impurities attached to the surface of the semi-finished strip from affecting the electromagnetic shielding performance of the alloy material.

The prepared copper-iron alloy materials were tested by the shielded room method, and the test results are shown in Table 1.

The schematic structural diagram of the CFA95(t) 0.3mm air conditioning pipe made of the copper-iron alloy material prepared in this embodiment is shown in FIG. 10.

Embodiment 7: A preparation method of a copper-iron alloy material with electromagnetic shielding performance, including:

1) Smelting: The ingredients are calculated by percentage, the percentage of Fe in the raw material is 10%, and the percentage of Cu in the raw material is 90%; use an intermediate frequency induction furnace to smelt, and perform degassing and deoxidizing processes during the process. With electromagnetic stirring, a uniform alloy solution is obtained; among them, the Fe element is added in the form of a CuFe master alloy, and the Cu element is an electrolytic copper plate;

2) Casting: Use a graphite-lined copper crystallizer to cool and crystallize the alloy solution obtained in 1) at a casting speed of 100 mm/min to obtain a rectangular alloy ingot;

3) Hot rolling: Use a gas furnace to heat the alloy ingots obtained in step 2) at a heating temperature of 930°C, and after holding for 4 hours, hot rolling is performed in multiple passes on a two-roll reversible rolling mill;

4) Face milling: the hot-rolled billet in step 3) is milled up and down on the double-sided milling equipment, and the milling thickness is 1mm;

5) Cold rolling and annealing: cold rolling the strip obtained in step 4), annealing during the cold rolling process, annealing with a bell furnace, and annealing temperature controlled at 700°C to obtain a semi-finished strip;

6) Heat treatment and cleaning: the semi-finished strip obtained in step 5) is subjected to heat treatment, the heat treatment temperature is controlled at 450°C-550°C, and the surface is cleaned after the heat treatment to obtain the finished alloy strip.

The prepared copper-iron alloy materials were tested by the shielded room method, and the test results are shown in Table 1.

Table 1: Shielding performance index checklist

Alloy serial number	Frequency/MHz	Shielding effectiveness/dB
Example 1	14KHz	49.6
Example 2	200KHz	75.7
Example 3	450KHz	140.6
Example 4	950KHz	131.4
Example 5	3KHz	113.0
Example 6	6KHz	110.5
Example 7	10KHz	104.0

Electromagnetic shielding of copper-iron alloy:

After the copper-iron alloy undergoes large plastic deformation, the Fe phase in the copper matrix assumes a "needle" structure ("fibrous"). The magnetic field formed by the needle-like Fe phase has the same effect as the lightning rod, which can absorb the surrounding magnetic field and the magnetic field of the power plant. The magnetic field and the magnetic field have reversal properties, causing hysteresis and canceling each other out, thereby obtaining a perfect shielding effect.

Application examples of copper-iron alloys:

Copper-iron alloy belt: (Specification: (t) 0.01mm-(t) 0.3mm)

1. In the era of 5G communication, plates with electromagnetic shielding and conductive heat dissipation plates are required for wireless charging and flexible circuit boards (10μm);

2. The display manufacturer needs 1000mm*1000mm*0.1mm CFA95 strip for the display backplane material;

3. Materials for large shielding room;

4. Condensing tube, using CFA95(t) 0.3mm plate and strip welded into a plate for condensing tube etc.

Although the specific embodiments of the present invention are described above, those skilled in the art should understand that these are only examples, and various changes or modifications can be made to these embodiments without departing from the principle and essence of the present invention. modify. Therefore, the protection scope of the present invention is defined by the appended claims.

Claims (7)

1. A method for preparing a copper-iron alloy material with electromagnetic shielding performance, which is characterized in that it comprises:

   1) Smelting: the ingredients are calculated by percentage, the percentage of Fe in the raw material is 5%-10%, and the percentage of Cu in the raw material is 90%-95%; use an intermediate frequency induction furnace for smelting, in the process The degassing and deoxidation process is combined with electromagnetic stirring to obtain a uniform alloy solution; among them, the Fe element is added in the form of a CuFe master alloy, and the Cu element is an electrolytic copper plate;

   2) Casting: Use a graphite-lined copper crystallizer to cool and crystallize the alloy solution obtained in 1) at a casting speed of 50-100 mm/min to obtain a rectangular alloy ingot;

   3) Hot rolling: Use a gas furnace to heat the alloy ingots obtained in step 2) at a heating temperature of 890°C to 930°C, and after holding for 3-4 hours, hot rolling is carried out in multiple passes on a two-roll reversing rolling mill;

   4) Face milling: the hot-rolled billet in step 3) is milled up and down on the double-sided milling equipment, and the milling thickness is 0.5mm-1mm;

   5) Cold rolling and annealing: cold rolling the strip obtained in step 4), annealing during the cold rolling process, annealing with a bell furnace, and annealing temperature controlled at 600°C-700°C to obtain a semi-finished strip;

   6) Heat treatment and cleaning: the semi-finished strip obtained in step 5) is subjected to heat treatment, the heat treatment temperature is controlled at 450°C-550°C, and the surface is cleaned after the heat treatment to obtain the finished alloy strip.
2. The method for preparing a copper-iron alloy material with electromagnetic shielding properties according to claim 1, wherein the specific operation of the step 3) is: first preheat the two-roll reversible rolling mill to a temperature of 750° C. to 850° C. Then, the alloy ingot is hot-rolled through 4-8 passes until the thickness of the alloy ingot is 70-95 mm.
3. The method for preparing a copper-iron alloy material with electromagnetic shielding properties according to claim 1 or 2, characterized in that, in the step 4), the upper milling feed rate is 30-60 mm/min, and the lower milling feed rate is 50-90mm/min.
4. The method for preparing a copper-iron alloy material with electromagnetic shielding properties according to at least one of claims 1 to 3, characterized in that, in the step 5), during the annealing treatment, adding to the bell furnace Nitrogen and methanol, the flow rate of the nitrogen is 2m ³ /h-4m ³ /h, the flow rate of the methanol is 0.08L/h-0.15L/h, the heating time is 15min-45min, and the heating temperature is 620℃-670 ℃, heat preservation treatment for 0.5h-2.0h, and control the furnace pressure of the bell furnace to 180Pa-320Pa.
5. The method for preparing a copper-iron alloy material with electromagnetic shielding performance according to at least one of claims 1 to 4, characterized in that, in step 6), the specific operation of the heat treatment is: the first stage The semi-finished strip is placed in a heat treatment furnace, and the temperature is 450℃-500℃, and the heat preservation treatment is 1.2h-2h; in the second stage, the semi-finished strip will be placed at a temperature of 500℃-700℃. Incubate for 2h-4h, then lower the temperature to 450℃-550℃, and heat preservation for 2.5h-4h.
6. The method for preparing a copper-iron alloy material with electromagnetic shielding properties according to at least one of claims 1 to 5, characterized in that, after the step 6) is completed, a polishing device is used to process the finished alloy strip Polished, and processed with magnetic particle inspection and ultrasonic inspection to check whether there are cracks in the finished alloy strip, and to ensure that the finished alloy strip is free of defects on the surface and inside.
7. The method for preparing a copper-iron alloy material with electromagnetic shielding properties according to at least one of claims 1-6, wherein the specific operation of the step 3) is: firstly preheat the two-roll reversible rolling mill to The temperature is 750° C.-850° C., and then the alloy ingot is hot-rolled for 6-10 passes until the thickness of the alloy ingot is 70-95 mm.

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