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针对红外隐身涂层发射率受颜料形状和涂层微结构等参数影响的问题,建立了基于有效介质理论和Kubelka-Munk理论的红外隐身涂层发射率预测模型。采用了Maxwell-Garnett有效介质近似模型,以Al作为颜料粒子,计算得到了含有空气和球形Al粒子的涂层等效折射率与波长的关系。从电磁波与颜料相互作用的机理出发,对涂层结构材料内部的后向散射效应进行了研究,结合几何光学理论计算了涂层的散射系数和吸收系数,以ZnS作为颜料粒子,定量分析了颜料形状和微结构参数对涂层发射率的影响,得出了涂层发射率与颜料粒子半径、体积百分比、等效折射率的关系。计算结果表明:该模型对红外隐身涂层的制备具有一定的指导作用。
In view of the problem that the emissivity of infrared stealth coating is affected by the shape of the pigment and the microstructure of the coating, the emissivity prediction model of infrared stealth coating is established based on the effective medium theory and Kubelka-Munk theory. The Maxwell-Garnett effective medium approximation model was used. The relationship between the refractive index and the wavelength of the coatings containing air and spherical Al particles was calculated using Al as the pigment particle. Based on the interaction between electromagnetic wave and pigment, the backscattering effect inside the coating material was studied. The scattering coefficient and absorption coefficient of the coating were calculated by combining the geometrical optics theory. ZnS was used as the pigment particle to quantitatively analyze the pigment Shape and microstructure parameters on the emissivity of the coating, the relationship between the emissivity of the coating and the pigment particle radius, volume percentage, and equivalent refractive index was obtained. The calculation results show that this model can guide the preparation of infrared stealth coating.