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Electromagnetic shielding material of coverage compound carbon base and its making method and purpose

An electromagnetic shielding material and shielding material technology, applied in the direction of magnetic/electric field shielding, shielding, electrical components, etc., to achieve the effect of overcoming non-magnetism, simple preparation method, and improved comprehensive stealth performance

Inactive Publication Date: 2007-11-28
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is an urgent need for a general method for depositing nanoscale soft magnetic iron particles with controllable thickness on the surface of carbon-based materials. So far, there has not been any relevant electromagnetic solid-liquid-gas three-phase fluidized core / shell composite method for carbonyl iron or nickel carbonylate, or A successful way to prepare coated shell-type composite carbon-based electromagnetic shielding materials by direct reaction coating of carbonylated iron-nickel mixture and carbon-based powder

Method used

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  • Electromagnetic shielding material of coverage compound carbon base and its making method and purpose
  • Electromagnetic shielding material of coverage compound carbon base and its making method and purpose

Examples

Experimental program
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Effect test

Embodiment 1

[0023] (1). Iron carbonyl and graphite powder (10 × 90 microns, thickness less than 2 microns) are mixed in a ratio of 80: 20 by weight; the coated particle raw material and the coating material The liquid raw material is placed in a reactor, stirred and suspended by an electromagnetic levitation stirrer, and the magnetic flux density maintained by the electromagnetic levitation stirrer in the reactor ranges from zero to three tesla;

[0024] (2). Nitrogen gas is passed into the suspension liquid in step (1), under nitrogen atmosphere, the reaction system is made to produce microbubbles to form a fluidized suspension system in which the solid-liquid-gas three-phase fully contacts, and the reaction suspension system is heated at the same time to react After fully reacting the mixture of step (1) for 10 hours at a temperature of 75°C, the final reactant becomes a powder product, and then heat-treats the resulting product in a nitrogen atmosphere at 180°C for 0.5 hour to obtain ir...

Embodiment 2

[0026] (1). Mix iron carbonylate and 30mm long carbon fiber powder in a ratio of 90:10 by weight; put the coated particle raw material and the liquid raw material of the coated substance in a reaction kettle, and stir with electromagnetic suspension The electromagnetic levitation stirrer keeps the magnetic flux density in the reactor in the range of zero to three tesla;

[0027] (2). Nitrogen gas is passed into the suspension liquid in step (1), under nitrogen atmosphere, the reaction system is made to produce microbubbles to form a fluidized suspension system in which the solid-liquid-gas three-phase fully contacts, and the reaction suspension system is heated at the same time to react At a temperature of 85°C, fully react the mixture of step (1) for 10 hours, make the final reactant into a powder product, and then heat-treat the resulting product in an argon atmosphere at 300°C for 1 hour to obtain a core / shell Shaped composite carbon fiber electromagnetic shielding material...

Embodiment 3

[0029] (1). After mixing iron carbonylate and nickel carbonylate at a ratio of 50:50 by weight, and then mixing them with elongated graphite powder (10×150 microns, thickness less than 2 microns) at a ratio of 50:50 by weight Proportional mixing; put the coated particulate raw material and the liquid raw material of the coated substance in a reaction kettle, stir and suspend with an electromagnetic suspension stirrer, and the magnetic flux density maintained by the electromagnetic suspension stirrer in the reaction kettle ranges from zero to three tesla;

[0030] (2). Nitrogen and argon are passed into the suspension liquid in step (1), and under the mixed atmosphere of nitrogen and argon, microbubbles are produced in the reaction system to form a fluidized suspension system in which solid-liquid-gas three-phase fully contacts, and at the same time Heat the reaction suspension system, at a reaction temperature of 85°C, fully react the mixture of step (1) for 10 hours, and make...

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Abstract

This invention relates to a covered compound carbon-base inorganic electromagnetic shield material, its preparation method and usage, which mixes carbonyl iron, carbonyl nickel or a mixture of carbonyl iron and nickel with carbon base powder in the weight percentage of 50-90 : 10-50 and suspends them fully with an electromagnetic suspension blender under inert gas atmosphere and 35-103dge.C to get powder, which is heated under 100-450deg.C inert gas atmosphere to become a covered compound carbon base electromagnetic shield material.

Description

technical field [0001] The invention belongs to the field of electromagnetic shielding materials, in particular to a coated composite carbon-based inorganic electromagnetic shielding material and its preparation method and application. Background technique [0002] Due to the widespread application of electromagnetic devices in modern society, more and more electromagnetic interference problems have been brought about. Due to their high stability, easy compatibility and high heat resistance, inorganic composite electromagnetic shielding materials are used as a building to prevent electromagnetic interference. Potential materials in areas such as , communication tools, etc. have attracted widespread attention. Electromagnetic shielding materials not only need to have good performance of reflecting electromagnetic waves, but also need to have good performance of absorbing electromagnetic waves. "Thin, light, wide and strong" composite absorbing materials are hot spots and diff...

Claims

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Application Information

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IPC IPC(8): H05K9/00G12B17/02B22F1/02
Inventor 唐芳琼陈渊孟宪伟任俊
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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