【摘要】 基于时域有限差分法计算了不同微观结构ZrB₂-SiC陶瓷基复合材料的红外光谱特性，讨论了SiC颗粒形状、体积分数以及材料厚度对复合材料发射率的影响，评估了SiC颗粒形状和体积分数对材料红外隐身性能的影响规律。计算结果表明：添加SiC颗粒的ZrB₂-SiC复合材料总发射率比ZrB₂块材高，相比圆球和椭球形状SiC颗粒，添加晶须形状SiC的复合材料发射率较小，在10～14μm波段发射率随SiC体积分数的增加变化幅度较为剧烈，材料光谱发射率主要受其近表面材料微观结构的影响。SiC颗粒形状、体积分数在大气窗口内对复合材料平均发射率的最大影响比例分别为2.65%、16.1%。研究结果对ZrB₂-SiC陶瓷基复合材料光谱辐射特性调控以及提高材料红外隐身性能具有一定的理论指导意义。更多还原

【Abstract】 The infrared spectral properties of ZrB₂-SiC ceramic matrix composited with different microstructure were calculated based on the finite difference time domain （FDTD） method.The influences of SiC particle shape,volume fraction and material thickness on the infrared emissivity of the composites were discussed,and influences of SiC particle shape,volume fraction on the infrared stealth performance of the materials were also evaluated.The results show that the total emissivity of the composites doped with SiC particles is higher than that of bulk ZrB₂.The emissivity of the composites doped with whisker SiC particles is lower than doping with sphere and ellipse particles.The emissivity of the composites varies sharply with the increase of Si C volume fraction in the 10～14μm wavelength band.The spectral emissivity of the composite is mainly affected by the microstructure of the material near the surface.The largest influences of the above three parameters on the mean emissivity in the atmospheric window are 2.65%,16.1%respectively.The results will be useful for realizing the regulation of the spectral radiative characteristics of ZrB₂-SiC ceramic matrix composites and improving the infrared stealth performance.更多还原