阅读说明：本技术 一种电磁屏蔽体用CuFe合金复合材料的制备方法及其产品 (Preparation method of CuFe alloy composite material for electromagnetic shielding body and product thereof ) 是由 龚深 李周 庞永杰 于 2020-07-16 设计创作，主要内容包括：本发明公开了一种电磁屏蔽体用CuFe合金复合材料的制备方法及其产品,包括以下步骤：按照设计的配比加入电解铜和铜铁合金,并在保护气氛下进行熔炼,熔炼完毕后,进行浇注,得到不同成分的CuFe合金铸锭；对CuFe合金铸锭,通过均匀化退火-轧制-二次退火工艺至设计好的尺寸,得到CuFe合金板材；对CuFe合金板材进行表面处理,在一块CuFe合金板材上均匀铺一层高磁导率合金粉末,接着覆盖另一块CuFe合金板材,固定后进行轧制复合,根据设计的层数,重复铺高磁导率合金粉末+轧制复合,得到CuFe合金复合材料板料；CuFe合金复合材料板料进行热处理后,得到电磁屏蔽体用CuFe合金复合材料。(The invention discloses a preparation method of a CuFe alloy composite material for an electromagnetic shield and a product thereof, wherein the preparation method comprises the following steps: adding electrolytic copper and copper-iron alloy according to a designed proportion, smelting in a protective atmosphere, and pouring after the smelting is finished to obtain CuFe alloy cast ingots with different components; carrying out homogenizing annealing, rolling and secondary annealing on the CuFe alloy ingot to a designed size to obtain a CuFe alloy plate; carrying out surface treatment on CuFe alloy plates, uniformly paving a layer of high-permeability alloy powder on one CuFe alloy plate, then covering the other CuFe alloy plate, fixing, then carrying out rolling compounding, and repeatedly paving the high-permeability alloy powder and carrying out rolling compounding according to the designed number of layers to obtain a CuFe alloy composite material plate; and carrying out heat treatment on the CuFe alloy composite material plate to obtain the CuFe alloy composite material for the electromagnetic shield.)

1. The preparation method of the CuFe alloy composite material for the electromagnetic shield is characterized by comprising the following steps of:

1) adding electrolytic copper and copper-iron alloy according to a designed proportion, smelting in a protective atmosphere, and pouring after the smelting is finished to obtain CuFe alloy cast ingots with different components;

2) carrying out homogenizing annealing, rolling and secondary annealing on the CuFe alloy ingot obtained in the step 1) to a designed size to obtain a CuFe alloy plate;

3) carrying out surface treatment on the CuFe alloy plates in the step 2), uniformly paving a layer of high-permeability alloy powder on one CuFe alloy plate, then covering the other CuFe alloy plate, fixing, then carrying out rolling compounding, and repeatedly paving the high-permeability alloy powder and carrying out rolling compounding according to the designed layer number to obtain a CuFe alloy composite material plate;

4) and 3) carrying out heat treatment on the CuFe alloy composite material plate in the step 3) to obtain the CuFe alloy composite material for the electromagnetic shield.

2. The method for preparing the CuFe alloy composite material for the electromagnetic shield according to claim 1, wherein in the step 1), the designed proportion is Cu-10-40 wt% Fe; the copper-iron alloy used as the raw material is Cu-40 wt% Fe; stirring in the smelting process is carried out in a low-frequency magnetic field, smelting is carried out by adopting a vacuum induction furnace, and the vacuum degree is 10^-3～10^-1Pa, adopting a high-purity argon atmosphere as a protective atmosphere; the smelting temperature is 1400-1600 ℃; pouring mouldThe casting mold is a water-cooling mold, and the casting temperature is 1100-1300 ℃.

3. The method for preparing the CuFe alloy composite material for the electromagnetic shield according to claim 1, wherein in the step 2), the smelted ingot is subjected to homogenizing annealing treatment; the temperature of the homogenizing annealing treatment is 920-980 ℃, and the time is 8-24 h.

4. The method for preparing the CuFe alloy composite material for the electromagnetic shield according to claim 1, wherein in the step 2), the ingot after the homogenizing annealing treatment is cooled to 800-900 ℃ for rolling, wherein the rolling comprises hot rolling cogging and cold rolling, the total deformation of the hot rolling cogging is 65-90%, and the total deformation of the cold rolling is 75-85%; and carrying out secondary annealing treatment on the rolled intermediate blank, wherein the temperature of the secondary annealing treatment is 500-550 ℃, and the time is 2-6 h.

5. The method for preparing a CuFe alloy composite material for an electromagnetic shield according to claim 1, wherein in the step 3), the surface treatment is an acid pickling treatment; the high-permeability alloy powder is one of Fe-Si alloy powder or Fe-Si-Cr alloy powder, and the average grain diameter of the high-permeability alloy powder is less than 50 mu m; the mass ratio of the high-permeability alloy powder to the copper alloy plate is 1: 5-10.

6. The method for preparing the CuFe alloy composite material for the electromagnetic shield according to claim 1, wherein in the step 3), the number of designed layers of the copper alloy sheet is 2-10; the rolling compounding is carried out at room temperature, the rolling is carried out for 2 times in total, the deformation of the first time is less than 5%, the gas between plates is mainly extruded, and the deformation of the second time is gradually increased to 55-75%.

7. The method of claim 5, wherein the Fe-Si alloy powder is Fe-6 wt% Si alloy powder; the Fe-Si-Cr alloy powder is Fe-6 wt% Si-6 wt% Cr alloy powder.

8. The method for preparing the CuFe alloy composite material for the electromagnetic shield according to claim 1, wherein the heat treatment temperature in the step 4) is 200-550 ℃ and the time is 2-6 h.

9. The CuFe alloy composite material for the electromagnetic shielding prepared by the preparation method according to any one of claims 1-8.

Technical Field

The invention belongs to the technical field of copper alloy preparation, and particularly relates to a preparation method of a CuFe alloy composite material for an electromagnetic shield and a product thereof.

Background

With the rapid development of information technology, electronic equipment and electronic communication bring convenience to production and life of people, but also bring troubles, such as electromagnetic radiation; increasingly serious electromagnetic radiation can generate electromagnetic interference, electromagnetic information leakage, electromagnetic environment pollution and other problems, so that more troubles are brought to people, and electromagnetic shielding is an important method for solving the problems.

At present, copper alloys for electromagnetic shielding do not exhibit magnetism, and have low electromagnetic shielding performance in a low frequency range, so that the requirements of high-end electromagnetic shielding bodies cannot be met. In the application field of typical electromagnetic shielding bodies such as housings of electronic parts and wall materials of shielding chambers, an electromagnetic shielding body material with a wide frequency band and high shielding efficiency is needed.

Disclosure of Invention

The invention aims to provide a preparation method of a CuFe alloy composite material for an electromagnetic shield with wide frequency band and high shielding effectiveness and a product thereof.

The preparation method of the CuFe alloy composite material for the electromagnetic shield comprises the following steps:

1) adding electrolytic copper and copper-iron alloy according to a designed proportion, smelting in a protective atmosphere, and pouring after the smelting is finished to obtain CuFe alloy cast ingots with different components;

2) carrying out homogenizing annealing, rolling and secondary annealing on the CuFe alloy ingot obtained in the step 1) to a designed size to obtain a CuFe alloy plate;

3) carrying out surface treatment on the CuFe alloy plates in the step 2), uniformly paving a layer of high-permeability alloy powder on one CuFe alloy plate, then covering the other CuFe alloy plate, fixing, then carrying out rolling compounding, and repeatedly paving the high-permeability alloy powder and carrying out rolling compounding according to the designed layer number to obtain a CuFe alloy composite material plate;

4) and 3) carrying out heat treatment on the CuFe alloy composite material plate in the step 3) to obtain the CuFe alloy composite material for the electromagnetic shield.

In the step 1), the designed proportion is Cu-10-40 wt% of Fe, and the copper-iron alloy used as the raw material is Cu-40 wt% of Fe; stirring in the smelting process is carried out in a low-frequency magnetic field, smelting is carried out by adopting a vacuum induction furnace, and the vacuum degree is 10^-3～10^-1Pa, adopting a high-purity argon atmosphere as a protective atmosphere; the smelting temperature is 1400-1600 ℃; the casting mold adopts a water-cooling mold, and the casting temperature is 1100-1300 ℃.

In the step 2), carrying out homogenization annealing treatment on the smelted cast ingot; the temperature of the homogenizing annealing treatment is 920-980 ℃, and the time is 8-24 h; cooling the cast ingot subjected to the homogenizing annealing treatment to 800-900 ℃, and rolling, wherein the rolling comprises hot rolling cogging and cold rolling, the total deformation of the hot rolling cogging is 65-90%, and the total deformation of the cold rolling is 75-85%; and carrying out secondary annealing treatment on the rolled intermediate blank, wherein the temperature of the secondary annealing treatment is 500-550 ℃, and the time is 2-6 h.

In the step 3), the surface treatment is pickling treatment; the high-permeability alloy powder is one of Fe-Si alloy powder or Fe-Si-Cr alloy powder, and the average grain diameter of the high-permeability alloy powder is less than 50 mu m; the mass ratio of the high-permeability alloy powder to the copper alloy plate is 1: 5-10; the number of designed layers of the copper alloy sheet is 2-10; the rolling compounding is carried out at room temperature, the rolling is carried out for 2 times in total, the deformation of the first time is less than 5%, the gas between plates is mainly extruded, and the deformation of the second time is gradually increased to 55-75%.

Preferably, the Fe-Si alloy powder is Fe-6 wt% Si alloy powder; the Fe-Si-Cr alloy powder is Fe-6 wt% Si-6 wt% Cr alloy powder.

In the step 4), the temperature of the heat treatment is 200-550 ℃, and the time is 2-6 h.

The CuFe alloy composite material for the electromagnetic shield is prepared according to the preparation method.

The invention has the beneficial effects that:

1. the invention provides a CuFe alloy composite material for an electromagnetic shield and a preparation method thereof. The composition of the alloy powder with high magnetic conductivity can make up the defect of insufficient magnetic conductivity of the pure CuFe alloy, thereby effectively improving the electromagnetic shielding performance of the CuFe alloy composite material for the electromagnetic shield in a wide frequency range and meeting the high-end requirement of the electromagnetic shield.

2. The CuFe alloy composite material for the electromagnetic shield has the electromagnetic shielding performance of over 100dB in the frequency range of 1 KHz-3 GHz, and has wide application prospect in the field of electromagnetic shield requirements.

3. The invention discloses a preparation method of a CuFe alloy composite material for an electromagnetic shield, which comprises the steps of improving the distribution uniformity of iron in a copper matrix through electromagnetic stirring and rapid solidification of a water-cooling die in the vacuum smelting process to obtain a CuFe alloy cast ingot, then obtaining a CuFe alloy intermediate blank through hot rolling/cold rolling cogging, rolling and compounding the CuFe alloy intermediate blank with alloy powder with high magnetic conductivity to form the CuFe alloy composite material with high magnetic conductivity composite phase dispersed and distributed, then carrying out heat treatment to fully precipitate trace Fe phase in the Cu matrix, and removing part of processing tissues through recrystallization to finally prepare the metal composite material with good electromagnetic shielding performance in a wide screen range. The preparation method has the advantages of simple preparation process, low cost and low equipment requirement, and can be suitable for large-scale production.

Drawings

FIG. 1 is a schematic representation of the composite obtained in example 1.

Fig. 2 is a graph showing the electromagnetic shielding performance of the composite material obtained in example 1.

FIG. 3 is an SEM photograph of the composite material obtained in example 1.

FIG. 4 is an SEM photograph of the composite material obtained in example 2

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art without any creative work based on the embodiments of the present invention belong to the protection scope of the present invention. The experimental procedures described in the following examples are conventional unless otherwise specified, and the reagents and materials described therein are commercially available without further specification.