In this article, a unique high infrared emissivity porous ceramic coating was prepared by slurry spraying method. In the first step, flower-like CeO₂ powder particles were synthesized by precursor pyrolysis method using Ce₂(CO₃)₃·8H₂O as the transition phase. Subsequently, flower-like CeO₂ ceramic particles (filler) and silicate (binder) were deposited by air spraying. The microstructure and phase composition of the prepared particles and the ceramic coating were examined using X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and X-ray diffraction (XRD). High temperature performance of the coating was assessed by conducting prolong isothermal oxidation and thermal shock tests. Infrared emissivity of the coating was tested at 750 °C by employing infrared radiation instrument. The prepared coating exhibited excellent high temperature resistance and high infrared emissivity (ε_3-5μm = 0.887, ε_8-14μm = 0.889 and ε_2.5-19μm = 0.893) at 750 °C. This was attributed to the presence of a large number of pores (within and among CeO₂ particles) in the coating. In the end, possible mechanisms related with high infrared emissivity of the coating were discussed in detail.

本文采用浆料喷涂法制备了一种独特的高红外发射率多孔陶瓷涂层。第一步，以Ce ₂ (CO ₃ ) ₃ ·8H ₂ O为过渡相，通过前驱体热解法合成花状CeO ₂粉末颗粒。随后，花状的CeO ₂陶瓷颗粒（填料）和硅酸盐（粘合剂）通过空气喷涂沉积。使用 X 射线光电子能谱 (XPS)、扫描电子显微镜 (SEM) 和 X 射线衍射 (XRD) 检查制备的颗粒和陶瓷涂层的微观结构和相组成。通过进行长时间的等温氧化和热冲击试验来评估涂层的高温性能。使用红外辐射仪在 750 °C 下测试涂层的红外发射率。制备的涂层表现出优异的耐高温性和高红外发射率（ε _3-5μm  = _0.887 , ε _8-14μm  = 0.889 和 ε _2.5-19μm = 0.893) 在 750 °C。这归因于涂层中存在大量孔隙（CeO ₂颗粒内部和之间）。最后，详细讨论了与涂层高红外发射率相关的可能机制。