摘要
基于时域有限差分法计算了不同微观结构ZrB_(2)-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ZrB_(2)-SiC复合材料总发射率比ZrB_(2)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ZrB_(2)-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。
The infrared spectral properties of ZrB_(2)-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 ZrB_(2).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 ZrB_(2)-SiC ceramic matrix composites and improving the infrared stealth performance.
作者
谢奇
毛新宇
庄磊
王红洁
张虎
XIE Qi;MAO Xinyu;ZHUANG Lei;WANG Hongjie;ZHANG Hu(School of Aerospace Engineering,Xi'an Jiaotong University,Xi'an 710049,China;School of Materials Science and Engineering,Xi'an 710049,China)
出处
《工程热物理学报》
北大核心
2025年第2期596-602,共7页
Journal of Engineering Thermophysics
基金
国家自然科学基金项目(No.52276086)。
作者简介
谢奇(1999-),男,博士研究生,主要从事热辐射调控探究。;通信作者:张虎,教授,Email:huzhang@xjtu.edu.cn。
