SiC coating was prepared on the graphite substrate and the effects of substrate morphology on the thermal radiation properties of SiC coating were investigated. As the surface roughness of the graphite substrate decreasing from 2.95 to 0.68 μm, the total emissivity of SiC coating increased 28.33% at 1000 °C and 36.21% at 1600 °C, respectively. At the same time, the spectral emissivity of SiC coating on the graphite substrate all presented the obvious characteristic thermal radiation of SiC. Those results meant that the thermal radiation properties of the coating were both dominated by the substrate and coating. A simple coating model had been established to explain the effect of the substrate morphology on the heat flow between the substrate and coating. The rough substrate morphology enhanced the energy dissipation at interface and weakened the thermal radiation properties of coating finally.

中文翻译：

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基体形貌对碳化硅涂层热辐射性能的影响

在石墨基体上制备了碳化硅涂层，研究了基体形貌对碳化硅涂层热辐射性能的影响。随着石墨基底的表面粗糙度从 2.95 μm 降低到 0.68 μm，SiC 涂层的总发射率在 1000 °C 时分别增加了 28.33%，在 1600 °C 时增加了 36.21%。同时，石墨基体上SiC涂层的光谱发射率均呈现出明显的SiC热辐射特征。这些结果意味着涂层的热辐射性能均受基材和涂层的支配。建立了一个简单的涂层模型来解释基体形态对基体和涂层之间热流的影响。