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Preparation method of electromagnetic shielding multi-layer composite material in electric vacuum device

A multi-layer composite material, electromagnetic shielding technology, applied in chemical instruments and methods, layered products, metal layered products, etc., can solve the problem of reducing the performance of Mo/Cu/Fe materials, low machining yield, Cu/Fe Low strength and other problems, to achieve the effect of good magnetic screen effect, good thermal matching and high production efficiency

Inactive Publication Date: 2011-07-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these materials all have certain shortcomings: copper / stainless steel has the problems of poor magnetic shielding effect, poor heat dissipation, and mismatching thermal expansion coefficients; Cu / Fe / Cu sheets have low strength and mismatching thermal expansion coefficients; Cu / Mo / Cu There is the problem of poor magnetic shielding effect of the sheet; although the Mo / Cu / Fe multi-layer laminated composite material has excellent comprehensive performance in thermal conductivity, thermal expansion coefficient, magnetic shielding performance, etc., but the traditional diffusion welding method is used. Problems such as low strength between Cu / Fe layers and poor parallelism between Fe foils lead to very low machining yield and reduce the performance of Mo / Cu / Fe materials, thus limiting its application prospects. New preparation methods for multi-component and multi-layer magnetic shield materials are particularly important and urgent

Method used

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  • Preparation method of electromagnetic shielding multi-layer composite material in electric vacuum device
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  • Preparation method of electromagnetic shielding multi-layer composite material in electric vacuum device

Examples

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Effect test

Embodiment 1

[0029] Select DT9 electrical pure iron and TU1 oxygen-free copper sheets produced by vacuum induction and electroslag remelting smelting processes, both of which are 2mm thick, and cut and prepare materials according to the size of 100×30mm; the prepared materials are respectively polished with water abrasive paper and ultrasonic Cleaning, 10%NaOH+10%Na 2 CO 3 Alkaline solution and its concentration is 15% HCl+10% HNO 3 The surface pretreatment of the acid solution is carried out in the steps of acid-base cleaning and final alcohol cleaning; then the two metal surfaces are roughened with a steel brush to expose the fresh metal; finally, the riveted laminate is assembled in the order of Cu / Fe / Cu, and immediately Carry out cold rolling and compounding with a reduction rate of 70%; carry out multiple times of inert gas protection annealing and cold rolling on the rolled parts. As thin as 0.3mm, Cu / Fe / Cu foil is obtained; finally, a molybdenum sheet with a surface roughness of R...

Embodiment 2

[0031] Select DT8 electrical pure iron and TU1 oxygen-free copper sheet produced by vacuum induction and electroslag remelting smelting process. Cleaning, 10%NaOH+10%Na 2 CO 3 Alkaline solution and its concentration is 15% HCl+10% HNO 3 The surface pretreatment of the acid solution is carried out in the steps of acid-base cleaning and final alcohol cleaning; then the two metal surfaces are roughened with a steel brush to expose the fresh metal; finally, the riveted laminate is assembled in the order of Cu / Fe / Cu, and immediately Carry out hot rolling compounding with a reduction rate of 50% at a temperature of 850°C; and perform multiple times of inert gas protection annealing and cold rolling on the rolled piece, the annealing temperature is 500-550°C, and the deformation amount of each pass is: 20%- 30%, thinned to 0.1mm to obtain Cu / Fe / Cu foil; finally select the WCu sheet with a surface roughness of Ra1.6, stack the WCu sheet with the rolled Cu / Fe / Cu foil, and put it into...

Embodiment 3

[0033] Select DT8 electrical pure iron and TU1 oxygen-free copper sheet produced by vacuum induction and electroslag remelting smelting process. Cleaning, 10%NaOH+10%Na 2 CO 3 Alkaline solution and its concentration is 15% HCl+10% HNO 3The surface pretreatment of the acid solution is carried out in the steps of acid-base cleaning and final alcohol cleaning; then the two metal surfaces are roughened with a steel brush to expose the fresh metal; finally, the riveted laminate is assembled in the order of Cu / Fe / Cu, and immediately Carry out hot rolling compounding with a reduction rate of 50% at a temperature of 820°C; carry out multiple hydrogen protection annealing and cold rolling on the rolled parts, annealing temperature: 550-600°C, and pass deformation: 30%-40 %, thinned to 0.2mm to obtain Cu / Fe / Cu foil; finally select the MoCu sheet with a surface roughness of Ra1.0, laminate the MoCu sheet with the rolled Cu / Fe / Cu foil, and put it in a vacuum Diffusion welding is carrie...

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Abstract

The invention relates to a preparation method of an electromagnetic shielding multi-layer composite material in an electric vacuum device, which belongs to the field of preparation of layered composite materials. The preparation process comprises the following steps: firstly performing large-deformation rolling bonding on oxygen-free copper after surface treatment and an electrical pure iron thin plate, and getting a Cu / Fe / Cu composite foil with higher parallelism and mechanical properties; and then combining and stacking the Cu / Fe / Cu foil with a molybdenum sheet and other low thermal expansion refractory metals, placing in a diffusion welding furnace to perform diffusion welding at a certain temperature and pressure, and further preparing the multi-layer composite material with good magnetic shielding effect, high dimensional precision, strong mechanical properties and good thermal matching. By adopting the new preparation process, not only the problem that the low thermal expansion metals are difficult to compound is solved, but also the advantages of rolling bonding and the diffusion welding process can be fully played, thereby realizing good parallelism among laminated layers, high dimensional precision and excellent mechanical properties of the material, simultaneously having relatively low cost and high production efficiency, and being easy to realize large-scale and industrialized production.

Description

technical field [0001] The invention belongs to the field of layered composite material preparation, and in particular relates to a method for preparing an electromagnetic shielding multilayer composite material in an electric vacuum device. Background technique [0002] Nowadays, with the use of electronic and electrical equipment more and more frequently and widely, information exchange has also increased exponentially, which inevitably radiates electromagnetic energy to the environment, which not only has adverse effects on other equipment, but also easily causes electromagnetic leakage. Therefore, the research and development of various electromagnetic shielding materials has been paid more and more attention by people. The magnetic shield material in the electric vacuum device also has the characteristics of complex environment such as wide operating frequency bandwidth, small size, long continuous working time, and high ambient temperature. In order to reduce the influ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00B32B15/01
Inventor 王德志段柏华杨益航林高用孙海舟柳华炎汪异
Owner CENT SOUTH UNIV
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