热防护层对颗粒复合红外隐身涂层发射率的影响分析  

Effects of thermal protection layer on the emissivity of particlecomposite infrared stealth coatings

作　　者：宋正鑫 张文杰[1] 郑崇 张尚宇 刘林华 SONG Zhengxin;ZHANG Wenjie;ZHENG Chong;ZHANG Shangyu;LIU Linhua(School of Nuclear Science,Energy and Power Engineering,Shandong University,Jinan 250061,China;National Key Laboratory of Scattering and Radiation,Beijing 100854,China)

机构地区：[1]山东大学核科学与能源动力学院,山东济南250061 [2]散射辐射全国重点实验室,北京100854

出　　处：《红外与激光工程》2025年第3期164-173,共10页Infrared and Laser Engineering

基　　金：国家自然科学基金项目(52006127,52306098)。

摘　　要：针对红外隐身涂层实际应用中,热防护层的加入将改变涂层内部辐射传输过程,进而影响表观辐射特性的问题,采用时域有限差分方法研究了两种典型热防护层材料氧化钇稳定氧化锆和SiO_(2)气凝胶厚度对颗粒复合型红外隐身涂层表观发射率的影响,并分析了热防护层不同复折射率和低发射率层不同组份配比下热防护层厚度对发射率的影响规律。研究结果表明:在颗粒复合型低红外发射率涂层下叠加热防护层将增大涂层的表观发射率,且表观发射率随着热防护层厚度的增大而增大,甚至失去低发射特性;热防护层选用高吸收系数的隔热材料时,其厚度变化对表观发射率的影响更为显著。该研究可为红外隐身涂层的设计应用提供一定的理论参考。Objective According to the Stefan-Boltzmann’s law,infrared(IR)stealth can be realized by reducing both the surface temperature and the surface IR emissivity.In the practical applications of IR stealth coatings,in order to reduce the surface temperature of high-power military equipment,a thermal protection layer is often stacked between the particle-composite low emissivity coating and the bare equipment skin surface.However,the radiation transfer process in the stacked structure will differ from the case of only particle-composite low emissivity coating used,hence the apparent emissivity of the stacked IR stealth coatings will deviate from the originally designed particle-composite low emissivity coatings,which will further affect the IR stealth performance.Therefore,it is of great engineering importance to investigate the effects of the material and thickness of the thermal protection layers on the apparent emissivity of the stacked particle-composite IR stealth coatings.Methods A structure model composed of particle-composite low emissivity coating,thermal protection layer and substrate is built(Fig.1).The filler particles are simplified to be spherical and distributed uniformly in the top particle-composite low emissivity coating layer.The Finite-Difference Time-Domain(FDTD)method is applied to simulate the electromagnetic response of the stacked structure in the spectral range of 3-14μm.The spectral average emissivity of the stacked structure is extracted to investigate the effects of the thickness of the thermal protection layer of different material(YSZ,SiO_(2) aerogel,and other materials of different complex refractive index).Moreover,the power absorption density distribution is calculated to analyze the mechanism of the thermal protection layer on the apparent emissivity.Results and Discussions The apparent spectral emissivity of the IR stealth coating is increased after a YSZ or SiO_(2) aerogel thermal protection layer is added between the particle-composite layer and the bare skin surface(Fig.5).The

关 键 词：颗粒复合涂层 红外隐身 热防护层 发射率 复折射率 

分 类 号：O434.3[机械工程—光学工程]