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Novel electromagnetic shielding composite material and its preparing method

A composite material, electromagnetic shielding technology, applied in the direction of magnetic field/electric field shielding, electrical components, etc., to achieve the effects of excellent electrical and magnetic shielding, shortened preparation time, and good performance

Inactive Publication Date: 2006-11-22
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, nickel particles and carbonyl iron or nickel particles and nickel zinc ferrite are added to the polymer, but this type of material can only shield electromagnetic waves well in the low frequency range

Method used

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  • Novel electromagnetic shielding composite material and its preparing method
  • Novel electromagnetic shielding composite material and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] According to the formula listed in Table 1, weigh an appropriate amount of nickel powder, Y-shaped hexagonal ferrite and 0.416g of polyvinylidene fluoride, mix them evenly, place them in the mold, and press them at 200°C and 15MPa for 15 minutes to form a series of samples. .

[0023] Numbering

[0024] Description: Each composite material contains 50vol% PVDF and weighs 0.416g

Embodiment 2

[0026] According to the formula listed in Table 2, weigh an appropriate amount of nickel powder, Y-shaped hexagonal ferrite and 0.416g polyvinylidene fluoride, mix them evenly, place them in the mold, and press them at 200°C and 15MPa for 15 minutes to form a series of samples. .

[0027] Numbering

[0028] Description: Each composite contains 50vol% PVDF and weighs 0.416g.

Embodiment 3

[0030] According to the formula listed in Table 3, weigh an appropriate amount of nickel powder, Z-type hexagonal ferrite and 0.416g of polyvinylidene fluoride, mix them evenly, put them in the mold, and press them at 200°C and 15MPa for 15min to form a series of samples. .

[0031] Numbering

[0032] Description: Each composite contains 50vol% PVDF and weighs 0.416g.

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Abstract

The invention relates to a composite material formed by conductive stuff and ferromagnetic material, belonging to the electromagnetic shield material, and relative preparation. Wherein, it uses four three-phase composite systems as Ba3Co2Fe23O41-Ni-PVDF as the experiment object; according to volume formula, mixing hexagonal ferrite, metal nickel particles, and polyvinylidene fluoride uniformly, to be arranged in mould; at 180-220Deg. C and the pressure as 10-15MPa, hot pressing them for 15-20mins to be molded; its total shield effect is 30-50dB at 8.2-12.4GHz; and it can avoid the secondary pollution of electromagnetic wave, with better frequency stability of total shield effect. The invention combines the electric shield and magnetic shield, to mainly adsorb the electromagnetic wave, with wider application.

Description

technical field [0001] The invention belongs to the field of electromagnetic shielding materials, and in particular relates to a novel electromagnetic shielding composite material which is composed of conductive filler and ferromagnetic filler, has low preparation temperature and simple process and a preparation method thereof. Background technique [0002] With the rapid development of wireless communication technology, problems such as electromagnetic interference, electromagnetic information leakage, and electromagnetic environmental pollution have become more and more serious. At present, almost all electronic and electrical equipment are inevitably disturbed by electrical and magnetic signals. Therefore, the problem of electromagnetic interference has been widely concerned, and the research on electromagnetic shielding materials has also become a hot spot, which is of great significance to the sustainable development strategy of the national economy. Compared with the ...

Claims

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Application Information

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IPC IPC(8): H05K9/00
Inventor 南策文李宝文沈洋
Owner TSINGHUA UNIV
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