Abstract Porous ceramics have attracted research interest because of their high levels of thermal and chemical stability. Reticulated porous ceramics have been fabricated for several decades. However, insufficient data exists regarding the radar-absorption properties of reticulated porous ceramics. Therefore, the authors investigated the feasibility of using reticulated porous ceramics, prepared using alumina, as a platform for a radar-absorbing coating-material, such as carbon. The experimental data were used to determine whether carbon-coated reticulated porous alumina could be effectively prepared while maintaining an acceptable compressive strength by controlling the processing conditions. The structural properties and radar-absorption properties of the carbon-coated reticulated porous alumina material were examined using scanning electron microscopy (SEM), mercury porosimetry, and a network analyzer. The compressive strengths of the reticulated porous alumina specimens could be tailored by controlling the sintering temperature and the pore density of the polyurethane foams. The reflection loss of the reticulated porous alumina specimen with a thickness of 18.40 mm, coated with a carbon slurry with a carbon content of 10 wt%, was calculated as approaching −40 dB at 10.0 GHz.

中文翻译：

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为潜在的雷达吸收应用开发具有定制结构特性的碳涂层网状多孔氧化铝材料

摘要 多孔陶瓷因其高水平的热稳定性和化学稳定性而引起了研究兴趣。网状多孔陶瓷已经制造了几十年。然而，关于网状多孔陶瓷的雷达吸收特性的数据不足。因此，作者研究了使用氧化铝制备的网状多孔陶瓷作为雷达吸收涂层材料（如碳）的平台的可行性。实验数据用于确定是否可以通过控制加工条件在保持可接受的抗压强度的同时有效制备碳包覆网状多孔氧化铝。使用扫描电子显微镜 (SEM)、水银孔隙率测定法和网络分析仪检查碳涂层网状多孔氧化铝材料的结构特性和雷达吸收特性。网状多孔氧化铝试样的抗压强度可以通过控制烧结温度和聚氨酯泡沫的孔隙密度来调整。厚度为 18.40 mm 的网状多孔氧化铝试样的反射损耗计算为在 10.0 GHz 下接近 -40 dB，该试样涂有碳含量为 10 wt% 的碳浆。