Fabrication of combustion pyrotechnics for laser and electromagnetic interference shielding  

作　　者：Yuan-yuan Yao Shao-hua Jin Jing Huang Dong-ze Li Bo-lin Xu Xi-juan Lv Qing-hai Shu 

机构地区：[1]School of Materials Science and Engineering,Beijing Institute of Technology,Beijing,100081,China [2]School of Physics,Beijing Institute of Technology,Beijing,100081,China [3]Beijing Institute of Electronic System Engineering,Beijing,100854,China [4]State-owned Changhong Machinery Factory,Guilin,541002,China

出　　处：《Defence Technology（防务技术）》2023年第6期140-147,共8页Defence Technology

基　　金：financial support from the Fundamental Research Funds for the Central Universities(No.3090011182152)。

摘　　要：The contradiction between flammability and packing density is the technical bottleneck for combustible smoke agent.Herein,polyurethane(PU)foams with flammability and resilience were prepared with polyol and isocyanate as raw materials by chemical foaming method,then compounded with metal powders,polytetrafluoroethylene(PTFE),phthalic annychide(PA),etc.in a certain proportion and pressed into pyrotechnic grain to obtain eco-friendly combustion aerosols with compact density of about1.15 g/cm^(3).The resulting combustion smoke agent combined the advantages of PU foam and pyrotechnic with easy ignition,large smoke production,long duration and low environmental pollution.The transmittance of aerosols for 532 nm and 1064 nm lasers was close to 0,and the EMI SE reached up to65 d B and 35 d B in GPS band and X band,respectively.In addition,the resulting pyrotechnic grains exhibited good mechanical strength and elasticity for sample 1:25,with a compressive strength of22 MPa and an elastic modulus of 195 MPa.The resulting combustion smoke agent is expected to play a potential role in the field of electromagnetic damage and protection.

关 键 词：Smoke agent FLAMMABILITY PU foam Laser masking EMI shielding 

分 类 号：TJ413.7[兵器科学与技术—火炮、自动武器与弹药工程]