Method for preparing carbon-wrapped iron-cobalt nano wave-absorbing material

A technology of nano-absorbing materials and carbon-coated iron-cobalt, which is applied to parts, shielding, and instruments of instruments, and can solve problems such as methods without nano-capsule absorbing materials

Inactive Publication Date: 2009-10-28
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0009] There are many similar technologies, but there is no method of prepari

Method used

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  • Method for preparing carbon-wrapped iron-cobalt nano wave-absorbing material
  • Method for preparing carbon-wrapped iron-cobalt nano wave-absorbing material
  • Method for preparing carbon-wrapped iron-cobalt nano wave-absorbing material

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Embodiment 1

[0026] The anode target Fe 55 co 45 alloy placed in figure 1 In the shown crucible 2 (in order to avoid impurities, the crucible is made of graphite), tungsten is the cathode. Vacuum the entire system to 5 x 10 -3 After Pa, fill in argon with a pressure of 16kPa and about 30ml of absolute ethanol. After the ethanol volatilizes for one hour, pass a current of 80A, a voltage of 20V, and arc discharge for 2 hours. After melting for 8 hours, extract the argon gas, put in the air, and then open the cover to collect the powder on the wall to obtain a carbon-coated iron-cobalt nano-absorbing material with a particle size of 10-40nm, and the transmission of carbon-coated iron-cobalt nanocapsules The electron microscope looks like figure 2 Shown in (a); The enlarged picture of the nanocapsule of carbon-coated iron-cobalt figure 2 Shown in (b), wherein core is FeCo, and shell is C; The X-ray diffraction spectrum of the nanocapsule of carbon-coated iron-cobalt is as image 3 Show...

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Abstract

The invention provides a method for preparing a carbon-wrapped iron-cobalt nano composite material with broad band and strong absorption. The composite material is prepared by adopting the technology that plasmas is generated by arc discharge of a negative electrode and a positive electrode under working gas, wherein the working gas is argon gas, simultaneously organic substances which can provide carbon elements and do not introduce impurities except C, H and O are added, the negative electrode is made of metals with high melting point and volatile difficulty such as tungsten and the like, and a target material for the positive electrode is iron-cobalt alloy, wherein the iron element accounts for 10 to 90 percent of alloy atomic. The carbon-wrapped iron-cobalt nano wave-absorbing material prepared by the method is a nano capsule formed by wrapping carbon outside the nano-scale iron-cobalt alloy; on one hand, a carbon shell layer is used as an oxidation resistant layer to increase the stability of a nano compound; and on the other hand, the carbon shell layer is used as a dielectric material and compounded with a magnetic iron-cobalt inner core so that the wave-absorbing property of the wave-absorbing material is superior to most classical ferrite and other most nano compound wave-absorbing materials.

Description

technical field [0001] The invention relates to a technology for preparing nano wave-absorbing materials, and in particular provides a method for preparing carbon-coated iron-cobalt nano method of absorbing materials. Background technique [0002] Absorbing materials (stealth materials) have been more and more widely used recently. With the increasingly prominent problems of electromagnetic wave interference in local area networks, electromagnetic wave radiation pollution, and aircraft stealth, the demand for electromagnetic wave absorption in the microwave band (2-18GHz) is increasing. [0003] However, some classic ferrites and many nanocomposites manufactured by recent inventions cannot cover the entire 2-18GHz frequency range. Therefore, it is of great significance to develop a wave-absorbing material with a wider frequency band and stronger absorption. The present invention provides a material that can select a certain absorption frequency range between 2-18 GHz by se...

Claims

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Application Information

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IPC IPC(8): G12B17/02H05H1/32
Inventor 韩拯李达耿殿禹刘先国王瀚谢志高孟辉龚文杰张志东
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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