Study On Infrared/Radar Stealth Performance Of Zinc Oxide/Porous Carbon Composites

The development of science and technology has made various optical electromagnetic detection technologies more and more mature.Therefore,it is extremely urgent to strengthen the defense and attack capabilities of weapons and equipment in the military field.Radar detectors dominate the various detectors;infrared detection is widely used as a detection method in recent years where the frequency of use is only lower than that of radar detection.Based on the principle of infrared stealth and radar stealth of the material,the zinc oxide powder with an infrared emissivity of 0.517 in the 8¹4?m band is prepared by ultrasonic assisted precipitation method.Then,spherical ordered mesoporous carbon and flakes are prepared.The five kinds of carbon-based materials such as ordered mesoporous carbon,hollow spherical mesoporous carbon,and silica/carbon?core/shell?are characterized by XRD,SEM,TEM,N₂ adsorption-desorption and other means.The electromagnetic parameters in the2¹8 GHz band are tested.We analyze its loss mechanism and find that the carbon material has high dielectric loss;In order to enhance the absorbing properties of these carbon materials,the magnetic materials?cobalt ferrite,iron,cobalt,nickel?are coated on their surface,due to the simultaneous presence of magnetic loss?dielectric loss and better impedance matching with free space,the modified magnetic carbon material exhibits excellent absorbing performance.Finally,zinc oxide is designed as the impedance matching layer and the infrared stealth layer?the second layer?.The magnetic carbon composite material is the double-layer infrared/radar wave compatible stealth material of the absorbing layer?the first layer?,and the thickness of the second layer is designed as 20 mm,we calculate the reflection loss of 2¹8GHz,and evaluate the absorbing performance of the single-layer absorbing agent.