| The research of infrared / millimeter-wave composite jamming materials is of far-reaching significance to improve China’s defense ability and photoelectric countermeasure capabilities.However,most of the jamming materials at this stage interfere with active millimeter-wave detection.There is no effective jamming material for terminal sensitive missile,which adopts active and passive detection.Therefore,it is necessary to study the millimeter-wave radiation characteristics of pyrotechnic combustion flame.In this paper,polyacrylonitrile(Pan)based carbon fiber was selected as the functional additive of pyrotechnic materials.This kind of semiconductor material has strong millimeterwave emissivity.By studying the millimeter-wave radiation performance and carbon fiber dispersion process of carbon fiber-based pyrotechnic materials,PAN-based carbon fiber with a short cutting length of 1.5 mm and dosage of 1 ～ 2% was determined as the formula material;Combined with the basic pyrotechnic formula,the millimeter-wave radiation performance of carbon fiber-based pyrotechnic combustion flame were analyzed in detail.By comparing the millimeter-wave radiation intensity produced by the combustion of pyrotechnic containing Zn,Si,Al,and Mg,the results show that when Mg is used as a combustible agent,the pyrotechnic can radiate strong millimeter-wave in the combustion process.The millimeter-wave radiation properties of Mg-based pyrotechnic combustion flame were studied and analyzed.The experimental results show that Mg O produced by Mg oxidation has high emissivity in mid infrared band and millimeter-wave band.Therefore,the pyrotechnic combustion flame with Mg as a combustible agent can produce infrared and millimeter-wave radiation simultaneously.On the premise of analyzing the millimeter-wave radiation mechanism of carbon fiber based pyrotechnic materials and Mg based pyrotechnic materials,the formulation of pyrotechnic materials was designed based on potassium nitrate / lactose / silica powder by adjusting the amount of Mg and carbon fibers.The radiation properties of different pyrotechnic materials during combustion were tested by a self-made 3 mm millimeter-wave radiometer and high-speed infrared thermal imager.The millimeter-wave radiation intensity and infrared radiation intensity of different formulations were compared.It is concluded that in pyrotechnic materials,the addition of Mg and carbon fiber can enhance the millimeter-wave and infrared radiation,and the increase of the two can be superimposed to a certain extent.In this study,adding 20% magnesium powder and 1% 1.5 mm chopped carbon fiber to the basic formula of potassium nitrate / lactose / silica powder can produce strong millimeter-wave radiation in the combustion flame of pyrotechnic materials. |
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