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首页> 外文会议>AIAA/ASME/ASCE/AHS/ASC structures, structural dynamics and materials conference >Analysis of a Microstructure for Highly Reflective Thermal Radiation Barrier Coatings
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Analysis of a Microstructure for Highly Reflective Thermal Radiation Barrier Coatings

机译：高反射热辐射阻隔涂层的微观结构分析

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A highly reflective multi-layer film is studied for use as a thermal radiation barrier coating (TRBC) to significantly reduce heat transfer to the structure from the high temperature environment. The multi-layer film consists of a three dimensional (3D) periodic microstructure with cylindrical nano-pores that are arranged periodically along the in-plane directions and with axes of pores parallel to the thickness direction. The pore diameter is varied periodically through the thickness to form a multi-layer film of alternating low and high porosities. This multi-layer microstructure acts as a photonic band gap (PBG) crystal, which gives rise to high reflectivity. The primary motivation behind considering this microstructure is that it can be fabricated from aluminum dioxide, which remains stable at high temperatures. The reflectivity of the multi-layer TRBC is computed from numerical simulations of the electromagnetic wave propagation through it. A homogenization method is employed to estimate the effective dielectric constant of each layer of the film. Consideration of homogenized layers reduces the 3D microstructure to an effective ID structure, thereby reducing the computational expense. The results of numerical simulations reveal that the reflectivity found considering the 3D multi-layer microstructure explicitly is close to that computed using homogenized layers. Finally, using the homogenized layers, it is shown that the peak as well as the average reflectivities of a multi-layer TRBC can be increased if the film consists of sets of bilayers with different thicknesses.
机译：研究了一种高反射率的多层薄膜，用作热辐射防护涂层（TRBC），可显着减少高温环境下传递至结构的热量。多层膜由具有圆柱状纳米孔的三维（3D）周期性微观结构组成，圆柱状纳米孔沿着面内方向周期性地排列，​​并且孔的轴平行于厚度方向。孔径随厚度周期性变化，以形成交替的低孔隙率和高孔隙率的多层膜。该多层微结构充当光子带隙（PBG）晶体，从而产生高反射率。考虑这种微观结构的主要动机是它可以由氧化铝制成，而氧化铝在高温下仍保持稳定。多层TRBC的反射率是通过电磁波在其中传播的数值模拟计算得出的。采用均质化方法估算薄膜每一层的有效介电常数。考虑均质化的层将3D微观结构减少为有效的ID结构，从而减少了计算费用。数值模拟的结果表明，考虑到3D多层微观结构而得到的反射率显着接近使用均质层计算出的反射率。最后，使用均质层显示，如果薄膜由不同厚度的双层薄膜组成，则多层TRBC的峰值和平均反射率可以提高。

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