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Method for preparing composite material of coiled carbon fibers filled with nano-magnetic micro-powder

A helical carbon fiber and nano-magnetic technology, which is applied in the field of composite material preparation, can solve the problems of the preparation method of filling nano-magnetic powder and the absence of helical carbon fiber, etc.

Active Publication Date: 2012-04-25
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Judging from the published literature, there is no report on the preparation method of helical carbon fiber filled with nano magnetic powder.

Method used

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  • Method for preparing composite material of coiled carbon fibers filled with nano-magnetic micro-powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] After 10 minutes of mechanical stirring, 10 grams of barium ferrite powder with a particle size of about 5 nanometers was uniformly dispersed in 50 milliliters of ethanol. Add 1 g of helical carbon fibers with a helical diameter of 2 microns, mechanically stir for 10 minutes, ultrasonically oscillate for 30 minutes, and evaporate ethanol to dryness. Add 10 ml of ethanol, stir for 10 minutes, use G3 sand core funnel to suction filter, and wash the filter cake with ethanol to remove excess nano-barium ferrite powder. Repeat the above steps 3 times to obtain the helical carbon fiber composite material filled with nano barium ferrite. The maximum real part of the magnetic permeability of the composite material can reach 6, and the imaginary part can reach 5.

Embodiment 2

[0022] After 60 minutes of mechanical stirring, 10 grams of iron powder with a particle size of about 200 nanometers was uniformly dispersed in 50 milliliters of ethanol. Add 1 g of helical carbon fibers with a helical diameter of 30 microns, mechanically stir for 60 minutes, ultrasonically oscillate for 90 minutes, and evaporate ethanol to dryness. Add 10 ml of ethanol, stir for 10 minutes, use G1 sand core funnel to suction filter, and wash the filter cake with ethanol to remove excess nano-iron powder. Repeat the above steps 10 times to obtain the helical carbon fiber composite material filled with nano-iron powder. The maximum real part of the magnetic permeability of the composite material can reach 6, and the imaginary part can reach 5.

Embodiment 3

[0024] After 30 minutes of mechanical stirring, 10 grams of zinc-manganese ferrite powder with a particle size of about 100 nanometers was uniformly dispersed in 50 milliliters of ethanol. Add 1 g of helical carbon fibers with a helical diameter of 15 microns, mechanically stir for 30 minutes, ultrasonically oscillate for 60 minutes, and evaporate ethanol to dryness. Add 10 ml of ethanol, stir for 10 minutes, use G2 sand core funnel to suction filter, and wash the filter cake with ethanol to remove excess nano-zinc-manganese ferrite powder. Repeat the above steps 6 times to obtain a spiral carbon fiber composite material filled with nano zinc-manganese ferrite powder. The maximum real part of the magnetic permeability of the composite material can reach 6, and the imaginary part can reach 5.

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Abstract

The invention relates to a method for preparing a composite material of coiled carbon fibers filled with nano-magnetic micro-powder. The method comprises the following steps: dispersing ferrite powder or iron powder with the grain diameters between 5 and 200 nanometers into ethanol uniformly; adding the coiled carbon fibers with the spiral diameters between 2 and 30 mu m; stirring the mixture; oscillating the mixture by using ultrasonic waves; evaporating the ethanol until the mixture is dry; adding a small amount of ethanol into an obtained product; leaching the obtained product by using a sand core funnel; washing a filter cake with the ethanol; and removing the ferrite powder or the iron powder which is not filled into coiled carbon fiber tubes to obtain the composite material of the coiled carbon fiber tubes filled with the nano-ferrite powder or the nano-iron powder. The method realizes the filling of the nano-magnetic micro-powder into the coiled carbon fibers by the methods of mechanical stirring, ultrasonic oscillation and the like. The magnetic performance of the magnetic composite material of the coiled carbon fibers filled with the nano-ferrite powder or the nano-iron powder is improved greatly, wherein the real part of a maximum value of the magnetic permeability is up to 6 from the original 1 and the virtual part is up to 5 from the original 0.

Description

technical field [0001] The invention relates to a preparation method of a composite material filled with helical carbon fibers by nano magnetic micropowder (nano ferrite or nano iron powder). technical background [0002] Spiral carbon fiber (CMC), also known as micro-carbon roll, is a spiral of micron-scale diameter formed by nano-scale carbon fibers, with a length of up to millimeters. It is a new type of carbon material that integrates micro and macro structures. In ZL200410034061.6, we introduced the preparation method and application of spiral carbon fiber in detail. Using the preparation method in this patent, we have achieved kilogram-level production and conducted more in-depth research on its application. [0003] In terms of use as a microwave absorbing material, due to the advantages of light weight, low surface density and good microwave absorption effect, the helical carbon fiber has potential application prospects, especially in the low frequency band. Accord...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/02
Inventor 徐海涛陈丽娟张兵郭燕川
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI