Method for preparing electromagnetic shielding light graphite based nanometer magnetic metal composite material

Abstract

The invention relates to a preparation method of a lightweight graphite-based nano-magnetic metal composite material used for electromagnetic shielding, which belongs to the related field of electromagnetic shielding materials; the precursor solution of expanded graphite and magnetic metal is mixed and stirred evenly, and dried after evaporating the solvent. The obtained mixture is treated in a reducing atmosphere at 300°C-1000°C, passivated with ordinary nitrogen and cooled to room temperature to obtain a composite material of expanded graphite and magnetic nanometer metal, and the relative content of the two can be adjusted. The composite material is light in texture, has excellent electromagnetic properties, and can be pressed into various shapes required. The material has excellent electromagnetic shielding performance in the range of 300kHz-1.5GHz, reaching 70-105dB, and the addition of magnetic metal improves the electromagnetic shielding performance of the expanded graphite in the low-frequency band. The method is simple and efficient, suitable for mass preparation, and the obtained product is expected to be applied in aerospace, military, electronic and electrical products.

Description

1. Technical Field: [0001] The invention relates to a preparation method of a lightweight graphite-based nano magnetic metal composite material used for electromagnetic shielding. 2. Background technology: [0002] With the rapid development of the electronics, electrical, communications and information industries and the widespread use of computers and mobile phones in daily life, there is more and more serious electromagnetic radiation in the human living environment. The study found that electromagnetic radiation not only interferes with electronic devices, but also harms the human body. In the past two decades, the increase in the incidence of cancer, leukemia and other diseases has a certain relationship with the increase in electromagnetic radiation. Electromagnetic wave pollution has become an increasingly important issue. Serious social problems. [0003] Electromagnetic radiation hazards mainly come from three aspects: 1. Electromagnetic interference (EMI), which mainly ...

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Problems solved by technology

2. Electromagnetic information will leak confidentiality, which will seriously affect the interests of enterprises and national political, economic, and military security issues; it is reported that equipment in a certain country can receive and display information on ordinary computers 1,000 meters away

3. Electromagnetic environmental pollution is the fourth major public hazard besides the three industrial wastes, causing certain harm to the human body and organisms; existing evidence shows that the human body is exposed to electromagnetic wave radiation for a long time, which will seriously damage the physical and mental health and affect the normal life order

This method is not easy to control the content and type of magnetic substances in the material, the electromagnetic shielding effect is general, and the scope of application is limited

Vovchenko et al. (Journal of Physics and Chemistry of Solids 65 (2004) 171-175) introduced a method for loading nano-metal particles on expanded graphite substrates, but before loading, the expanded graphite needs to be treated with acid. The method is more complicated and practical. Sexual restriction

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