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Study on the Fibrous Type Radar Absorbing Coating

Author: MengHui
Tutor: WangZhiHui
School: Beijing University of Technology
Course: Materials Processing Engineering
Keywords: carbon fiber chemical plating radar absorbing coating
CLC: TB34
Type: Master's thesis
Year: 2005
Downloads: 535
Quote: 3
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Abstract


The radar absorption materials (RAM) are the key of stealth technique for modern weapons. With the rapid development of stealth technique, many countries pay more attention to the research of RAM recently. In order to decrease areal density of these RAM, carbon fiber was studied in this research. The research detail can be summarized as follows: (1) A layer of metal was deposited on the surface of the carbon fiber by the process of chemical plating. The carbon fibers were analyzed by scanning electron microscope (SEM) and energy dispersive spectroscopy before and after the chemical plating. (2) After mixing the composite carbon fiber and adhesive fully, they were brushed on the surface of the Al-plate to prepare the carbon fiber absorbent coatings. The reflectivity of the coating was measured according to the standard GJB2038-94 by use of RAM reflectivity arc method. The influence of the category of the plated metal and the time of chemical plating on the absorbent property of the chemical plating carbon fiber coating was investigated. And the mechanism of radar absorbability of the plating carbon fiber coatings was studied basically. The results show that the reflectivity of carbon fiber absorbent coatings was above -1.5dB between 2GHz and 18GHz, and the reflectivity of the plating carbon fiber absorbent coatings was lower than -1.0dB in low and high frequency band, and the reflectivity was lower than -3.25dB in middle and high frequency band. The absorbing property in middle frequency band of the Ni and Co-plating carbon fiber coating has been improved compared with the Ni-plating carbon fiber. The time of chemical plating is one of the chief factors influencing the absorbent property. The absorbent properties of carbon fiber coating has been improved greatly after plating for 15 minutes, and the reflectivity was lower than -4.0dB between 4GHz and 18GHz.

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