| The analysis of jamming technology for infrared/passive millimeter-wave composite guidance weapons concluded that current jamming materials are difficult to form effective jamming for passive millimeter-wave guidance weapons.It was a great significance for countering infrared and passive millimeter wave composite guided weapons to study a surface-type decoy material,which has a high degree of similarity to the infrared and millimeter wave radiation of aircraft,tanks and other armors.According to the characteristics of a large number of radiation particles of different wavelengths in the pyrotechnic composition burning flame,the factors affecting the millimeter wave radiation of the pyrotechnic composition are explored based on the correlation principle of pyrotechnic flame radiation.Research was based on Mg/PTFE pyrotechnic materials,and film surface-type decoy materials with both infrared and millimeter wave radiation were prepared.Firstly,the preparation process of the pyrotechnic film was studied.Using the 12.5 g/m2non-woven fabric as the“skeleton”of the pyrotechnic film can effectively improve the strength and flexibility of the pyrotechnic film without affecting the pyrotechnic effect.In addition,the correlation between the millimeter wave radiation brightness temperature,flame temperature and combustion products of pyrotechnic composition such as Mg/PTFE、Mg/PTFE/KNO3was studied.The analysis showed that the millimeter-wave radiation brightness temperature was mainly influenced by the emissivity of combustion products,and the combustion product Mg O had a high emissivity in the millimeter wave band.By analyzing the combustion temperature,combustion products and millimeter wave radiation brightness temperature of combustible agents（Mg,Al,Fe,Zn,Si）,the millimeter wave emissivity of oxidation products can be determined as:Mg O>Al2O3>Si O2>Zn O>Fe2O3.Substituting red phosphorus（RP）for part of the Mg in Mg/PTFE can effectively reduce the combustion temperature,and an appropriate amount of red phosphorus was beneficial to increase the pyrotechnic radiation area.Carbon fiber as a functional additive can increase the radiant brightness temperature of the pyrotechnic powder in the millimeter wave band.When the millimeter wave radiation brightness temperature is low,the increase of the radiation brightness temperature is more obvious after adding carbon fiber.The radiation of pyrotechnic composition formulated with KR/Mg/KNO3/PTFE in the millimeter wave band was greatly affected by KNO3.The brightness temperature of millimeter wave radiation had a strong consistency with the Mg O content of combustion products,and the ratio of Mg and KNO3 can be adjusted to achieve different bait interference requirements. |
