Preparation method of carbon fiber surface nano CoFeB microwave-absorbing coating

A wave-absorbing coating and carbon fiber technology, which is applied in the field of carbon fiber surface coating preparation, can solve the problems of poor impedance matching characteristics and excessively high carbon fiber dielectric constant, and achieve good wave-absorbing performance

Inactive Publication Date: 2014-05-07
HARBIN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the problem of poor impedance matching characteristics caused by the high dielectric constant of existing carbon fibers, and provides a method for preparing a nano-CoFeB wave-absorbing coating on the surface of carbon fibers

Method used

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  • Preparation method of carbon fiber surface nano CoFeB microwave-absorbing coating

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specific Embodiment approach 1

[0007] Specific Embodiment 1: The preparation method of a nano-CoFeB wave-absorbing coating on the surface of carbon fiber in this embodiment is realized according to the following steps: 1. Keep the carbon fiber at 400°C for 10-30 minutes; 2. Treat the carbon fiber after step 1 Ultrasonic cleaning in acetone for 10 to 30 minutes; 3. Soak the carbon fibers treated in step 2 in nitric acid with a mass percentage of 65% for 0.5 to 4 hours, and then wash them with deionized water for 5 to 6 times; 4. Put the carbon fiber processed in step 3 into SnCl 2 Sensitize in a mixed solution with HCl, the sensitization time is 10-30min, and obtain the sensitized carbon fiber; 5. Put the sensitized carbon fiber into PdCl 2 Activate in a mixed solution with HCl for 10-30 minutes to obtain activated carbon fibers; 6. Put the activated carbon fibers into the plating solution at 20-85°C for 0.1-20 minutes to complete the carbon fiber surface The preparation of nano-CoFeB wave-absorbing coating...

specific Embodiment approach 2

[0009] Embodiment 2: This embodiment is different from Embodiment 1 in that in Step 1, the carbon fiber is kept at 400° C. for 15 minutes. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0010] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in step 2, the carbon fiber is put into acetone and ultrasonically cleaned for 20 minutes. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention provides a preparation method of a carbon fiber surface nano CoFeB microwave-absorbing coating and relates to a preparation method of a carbon fiber surface coating. The coating provided by the invention is mainly used for solving the problems that the existing carbon fiber is overhigh in dielectric constant and impedance matching characteristic of the carbon fiber is poor. The preparation method provided by the invention comprises the following steps of: firstly, insulating carbon fiber at the temperature of 400 DEG C; secondly, placing the carbon fiber into acetone to be subjected to ultrasonic cleaning; thirdly, placing the carbon fiber into nitric acid to be soaked, and then cleaning the carbon fiber; fourthly, sensitizing the carbon fiber; fifthly, activating the sensitized carbon fiber; and finally, placing the activated carbon fiber into a plating solution to be soaked, so that the preparation of the carbon fiber surface nano CoFeB microwave-absorbing coating is completed. The coating prepared by adopting the preparation method provided by the invention has good electromagnetic wave absorbing effect in wide frequency band and also can effectively adjust the impedance matching characteristic of the carbon fiber. The preparation method provided by the invention is applied to the field of composite materials.

Description

technical field [0001] The invention relates to a preparation method of a carbon fiber surface coating. Background technique [0002] Carbon fiber has a series of excellent properties such as high tensile strength, high tensile modulus, low density, high temperature resistance, ablation resistance, corrosion resistance, high electrical and thermal conductivity, low thermal expansion, self-lubrication, etc. It is a structural wave-absorbing composite One of the reinforcements widely used in materials. However, because its high dielectric constant deteriorates its impedance matching characteristics, the operating frequency band of structural absorbing materials is often narrow. Contents of the invention [0003] The invention aims to solve the problem of poor impedance matching characteristics caused by the high dielectric constant of existing carbon fibers, and provides a method for preparing a nano-CoFeB wave-absorbing coating on the surface of carbon fibers. [0004] Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C18/18C23C18/50
Inventor 刘刚迟庆国刘者钟蕊
Owner HARBIN UNIV OF SCI & TECH
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