The radiative properties of a ceramic strut cannot be strictly the same as that of a dense sintered ceramic bulk composed of the same material. This contribution develops an approach to determine the radiative properties of semitransparent ceramic struts of open-cell foams. First, a macro-scale measurement was conducted to obtain the normal-hemispherical transmittance and reflectance spectra of alumina foam slices. Second, a pore-scale forward model was established to predict the radiative behaviors of 3D digital porous structures obtained from micro-computed tomography technique. Last, an identification method was proposed to retrieve the radiative properties of semitransparent ceramic struts from the measured data. The results indicate that it is unreasonable to simply assume the radiative properties of alumina struts as that of corresponding dense bulks. Within the investigated wavebands 0.4–2.2 μm, the average extinction coefficient of alumina struts is 33.5% lower than that of dense bulks. The scattering albedo shows a slight difference between alumina struts and dense bulks. Besides, the retrieved extinction coefficients and scattering albedos of alumina struts are proposed as a function of wavelengths, which can be used in potential applications.

陶瓷支柱的辐射特性不能与由相同材料组成的致密烧结陶瓷块的辐射特性严格相同。这种贡献为确定开孔泡沫的半透明陶瓷支柱的辐射特性提供了一种方法。首先，进行宏观测量以获得氧化铝泡沫切片的法向半球透射率和反射光谱。其次，建立了一个孔隙尺度正向模型，以预测通过微计算机断层扫描技术获得的3D数字多孔结构的辐射行为。最后，提出了一种识别方法，可以从测量数据中检索半透明陶瓷支柱的辐射特性。结果表明，简单地假设氧化铝支柱的辐射特性与相应的致密块的辐射特性是不合理的。在研究的0.4-2.2μm波段内，氧化铝支杆的平均消光系数比致密块的平均消光系数低33.5％。散射反照率显示出氧化铝支柱和致密块之间的细微差别。此外，提出了氧化铝支柱的消光系数和散射反照率随波长的函数关系，可用于潜在的应用中。