Composite wave absorbing material and preparation method thereof

A technology of composite wave-absorbing materials and nanomaterials, which is applied in the field of composite materials with electromagnetic wave absorption and its preparation, can solve the problems of wave-absorbing ability to be improved, poor heat dissipation performance, and narrow wave-absorbing frequency band, and achieve light weight, Good heat dissipation performance and wide frequency absorption effect

Inactive Publication Date: 2011-05-04
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many deficiencies in carbon nanotube composite materials: first, the absorbing ability needs to be improved; second, the absorbing frequency band is narrow; third, the heat dissipation performance is not good

Method used

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  • Composite wave absorbing material and preparation method thereof
  • Composite wave absorbing material and preparation method thereof
  • Composite wave absorbing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] This embodiment provides a method for preparing magnetic nanotubes with a porous anodic aluminum oxide template (Anodic Aluminum Oxide, AAO) method, which method includes the following steps:

[0070] a. Pretreatment of aluminum flakes

[0071] Cut a high-purity aluminum sheet with a thickness of 0.5mm (purity 99.999%) into 80mm×80mm×0.5mm, put the aluminum sheet into a beaker filled with absolute ethanol, and ultrasonically clean it for 5 to 10 minutes to remove surface stains. In order to remove the aluminum oxide layer on the surface of the aluminum sheet, put it into a sodium hydroxide solution with a concentration of 1M. After observing that the bubbles generated on the surface of the aluminum sheet decrease, take out the aluminum sheet and rinse it with deionized water. The pretreated aluminum sheet was put into a mixed solution of ethanol and perchloric acid with a volume ratio of 4:1, polished at a constant voltage of 13V DC for 3 minutes, and then rinsed with d...

Embodiment 2

[0084] This example provides a method for preparing magnetic nanowires. The difference between this method and Example 1 is that in this example, in step d, the thickness of the gold-plated film exceeds 300nm, so that one end of the hole of the AAO template is completely blocked. . All other steps of this embodiment are the same as in Embodiment 1. Figure 6 It is a cross-sectional view of the Co nanowires prepared by using the anodized aluminum template method in this example.

Embodiment 3

[0086] This embodiment provides a preparation method of a one-dimensional magnetic nanomaterial, the method includes: putting carbon nanotubes into a vacuum chamber for thermal evaporation coating, and depositing a layer of 3nm on the surface of carbon nanotubes using commonly used coating conditions. The Co thin film (actually coating Co nanoparticles on the surface of carbon nanotubes) forms a one-dimensional magnetic nanomaterial.

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Abstract

The invention provides a composite wave absorbing material. The material comprises a metal magnetic nano material and a matrix material; and the metal magnetic nano material is uniformly dispersed in the matrix material. The invention also provides a preparation method for the composite wave absorbing material, which comprises the following steps of: 1) preparing the metal magnetic nano material; and 2) uniformly dispersing the metal magnetic nano material into the matrix material to prepare a coating or a film material. The composite wave absorbing material has the advantages of strong wave absorbing capability, wide wave absorbing band, good heat dissipation performance, light mass and the like.

Description

technical field [0001] The invention belongs to the field of materials, in particular, the invention relates to a composite material with electromagnetic wave absorption function and a preparation method thereof. Background technique [0002] As we all know, absorbing materials have important application value in the military. With the development of electronic technology, electromagnetic waves of various frequencies enter people's lives. Electromagnetic radiation generated by microwave ovens, mobile phones and other electrical appliances has become an increasingly large source of pollution, which not only brings electromagnetic interference to electronic instruments, but also affects people's health. . Therefore, the development of absorbing materials is not only of great significance in the military, but also becomes an important topic of environmental protection. [0003] According to the mechanism of energy loss, absorbing materials can be divided into magnetic dielect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/00C25C5/02H05K9/00C09D5/23C09D5/32C08K3/08C08K7/04
Inventor 王文秀张佳刘东屏韩秀峰
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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